Physics Calculators

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Alien Civilization Calculator (Drake Equation)

Estimate the number of communicating alien civilizations in the Milky Way using the Drake Equation N = R* × fp × ne × fl × fi × fc × L. Free online extraterrestrial intelligence calculator with interactive charts.

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Daylight Calculator — Sunrise, Sunset & Day Length

Calculate sunrise, sunset, solar noon, and day length for any location and date using NOAA-accurate solar algorithms. Free online daylight calculator with annual trend charts and composition breakdowns for travelers, photographers, and outdoor planners worldwide.

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Distance to Horizon Calculator — How Far Can You See?

Calculate how far you can see to the horizon from any height above Earth, Moon, Mars, or Jupiter using geometry formula d = √((R+h)²−R²). Free online distance to horizon calculator with charts for physics students, sailors, and hikers.

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Drake Equation Calculator — N = R* × fp × ne × fl × fi × fc × L

Estimate the number of communicating extraterrestrial civilizations in the Milky Way using the Drake Equation N = R* × fp × ne × fl × fi × fc × L with interactive charts and breakdowns.

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Earth Curvature Calculator — Obscured Height & Horizon Distance

Find how much of a distant object is hidden behind the curve using d = √((R+h)²−R²). Free physics tool with unit conversion, charts, and breakdowns for sailors, photographers, and surveyors.

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Earth Orbit Calculator — Satellite Orbital Velocity & Period

Calculate Earth satellite orbital velocity, period, angular velocity, and total energy using Kepler's third law for any altitude from LEO to GEO. Free online orbital mechanics calculator with interactive charts.

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Escape Velocity Calculator

Calculate escape velocity, first cosmic velocity, and surface gravity for any celestial body using v_e = sqrt(2GM/R). Free online physics calculator.

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Exoplanet Discovery Calculator

Calculate transit depth, orbital radius, habitable zone, and temperature for any exoplanet using star mass, radius, temperature, and orbital period.

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Exoplanet Travel Planner

Plan interstellar journeys to exoplanets with relativistic time dilation, travel time, age on arrival, food and water supply estimates for any destination in light-years.

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Gravitational Time Dilation Calculator — Relativity Time Dilation

Calculate gravitational time dilation using Einstein general relativity formula t′ = t × √(1 − 2GM/rc²). Select Earth, Sun, Jupiter or enter custom mass and radius for any celestial body with interactive charts and breakdowns.

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Hohmann Transfer Calculator — Orbital Delta-v & Transfer Time

Calculate Hohmann transfer delta-v, transfer orbit parameters, orbital velocities, and time of flight between two circular orbits around Earth, Sun, Moon, Mars, Jupiter, or Saturn. Free online orbital mechanics calculator with interactive charts and breakdown for astrophysics students and aerospace engineers.

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Hubble's Law Calculator

Find galaxy recession velocity using Hubble's Law v = H₀ × d. Enter distance in Mpc and H₀ to compute cosmic expansion, universe age, and approximate redshift.

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Ideal Rocket Equation Calculator

Calculate rocket delta-v with the Tsiolkovsky ideal rocket equation Δv = Isp × g₀ × ln(m₀/mf). Free online physics calculator with charts and breakdown.

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Kepler Third Law Calculator — Orbital Period & Semi-major Axis

Calculate orbital period, semi-major axis, or central body mass using Kepler's Third Law: T² = 4π²a³/GM. Free online physics and astronomy calculator with charts.

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Light Year Calculator — Distance in km, mi, AU & parsecs

Calculate how far light travels in any time using the speed of light. Free online astronomy converter shows light years, km, miles, AU, and parsecs with charts.

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Luminosity Calculator — Stellar Brightness & Magnitude

Calculate stellar luminosity from star radius and surface temperature using the Stefan-Boltzmann law. Get absolute and apparent magnitude with interactive charts and breakdowns for astrophysics.

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Olbers' Paradox Calculator — Why Is the Night Sky Dark?

Explore Olbers Paradox — compute total flux, luminosity, or star density across universe models. Understand why the night sky is dark despite infinite stars.

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Orbital Period Calculator — Satellite & Binary System Periods

Calculate orbital periods for satellites around celestial bodies using mean density, or binary star systems using Kepler's third law. Free online astronomy calculator with interactive charts and multi-unit outputs.

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Orbital Velocity Calculator

Calculate orbital velocity, orbital period, and escape velocity for satellites and spacecraft around Earth, Sun, Moon, Mars, Jupiter, and Saturn. Free physics tool with interactive charts.

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Parallax Calculator — Stellar Distance Using Parallax Angle

Calculate stellar distances using the parallax method. Enter milliarcsecond angle to get distance in parsecs, light-years, AU, and km with interactive charts.

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Radiation Pressure Calculator

Calculate radiation pressure from stars using p = xLcos²α/(4πR²c) for external pressure or p = 4σT⁴/(3c) for stellar interior. Free online astrophysics tool with interactive charts and breakdowns.

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Redshift Calculator

Calculate the cosmological redshift z from observed and emitted wavelengths using z = (λobs − λemit) / λemit. Free online astrophysics calculator with velocity conversion and charts.

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Relativistic Kinetic Energy (KE) Calculator

Calculate relativistic kinetic energy using Einstein formula KE = m₀c²(1/√(1−v²/c²)−1). Enter mass and velocity as fraction of light speed to compute relativistic KE, Lorentz factor, rest energy, and total energy with interactive charts.

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Schwarzschild Radius Calculator — Black Hole Event Horizon

Calculate the Schwarzschild radius from mass using Rs = 2GM/c². Free online black hole radius calculator with celestial body presets, comparison charts, and detailed physics breakdowns for students.

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Space Travel Calculator — Relativistic Rocket Equation

Plan interstellar travel using the relativistic rocket equation. Compute travel time, fuel mass, and maximum velocity for journeys to stars and galaxies.

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100 Amp Wire Size Calculator

Find the correct wire gauge (AWG) for a 100 amp circuit using voltage, conductor material, distance, and NEC voltage drop formulas. Free online electrical wire sizing calculator.

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12V Wire Size Calculator

Find the correct wire gauge (AWG) for 12V DC automotive, marine, solar, and low-voltage lighting systems using voltage drop formulas and material resistivity. Free online 12V wire sizing calculator.

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24V Wire Size Calculator

Find the correct wire gauge (AWG) for 24V DC automotive, marine, solar, trolling motor, and low-voltage lighting systems using voltage drop formulas and material resistivity. Free online 24V wire sizing calculator.

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3-Phase Motor Amperage Calculator — Full Load Current

Calculate the full load current of any 3-phase or single-phase AC motor using power rating, voltage, power factor, and efficiency. Free online electrical motor amperage calculator for wire sizing and breaker selection.

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Absolute Humidity

Calculate absolute humidity in g/m³ from air temperature and relative humidity using the Magnus formula for HVAC, meteorology, environmental analysis, and building science applications

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Ac Wattage

Ac Wattage — solve physics problems across mechanics, electricity, and waves. Get instant results with breakdowns and charts.

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Acceleration

Calculate acceleration from initial and final velocity over time using the standard kinematics formula for physics problems and engineering applications.

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Acceleration Due To Gravity

Calculate gravitational acceleration at any altitude using the international gravity formula and free-air altitude correction for physics and geophysics

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Air Density Calculator — Calculate ρ from Temperature, Pressure, and Humidity

Calculate air density in kg/m³ from temperature, pressure, and relative humidity using the ideal gas law with water vapor correction for aviation, meteorology, and engineering. Free online calculator.

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Air Pressure At Altitude Calculator

Calculate atmospheric pressure at any altitude using the barometric formula. Free online pressure calculator with results in Pa, atm, and hPa plus interactive charts for aviation, hiking, meteorology, and physics.

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Angle of Repose Calculator — θ = arctan(μ)

Find angle of repose from friction coefficient μ or pile dimensions. Free physics calculator with material comparison charts and reference values for sand, gravel, and soil.

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Angular Velocity

Calculate angular velocity in rad/s using ω = Δθ/Δt or ω = v/r. Interactive physics calculator with charts and breakdowns for rotational motion problems.

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Aperture Area Calculator

Calculate aperture area from focal length and f-number using A = π(D/2)². Free online calculator with diameter, area, and charts for photographers and optics.

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API Gravity Calculator — Petroleum Liquid Gravity °API

Calculate API gravity of petroleum liquids from density or product selection using the standard API formula API = 141.5/SG − 131.5. Free online petroleum gravity calculator with instant results, classification charts, and step-by-step breakdowns.

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Archimedes' Principle Calculator — Buoyant Force & Object Density

Calculate buoyant force, object volume, and density using Archimedes' Principle F_b = ρgV. Enter true mass, apparent mass in fluid, and fluid density for instant physics results with charts.

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Arrow Speed Calculator — IBO Bow Speed & Kinetic Energy

Calculate arrow speed with the IBO formula. Free archery calculator for bow speed, kinetic energy, and momentum from draw length, draw weight, and arrow weight.

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Attenuation

Attenuation — solve physics problems across mechanics, electricity, and waves. Get instant results with breakdowns and charts.

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Barn Pole Paradox

Explore the relativistic barn-pole paradox and ladder paradox in special relativity. Compute length contraction, Lorentz factor γ, and door closing times in both barn and pole frames with interactive charts.

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Belt Length Calculator – Pulley Belt Sizing

Calculate exact belt length for two-pulley drives using the open belt formula. Free pulley belt sizing tool for V-belts, timing belts, and flat belt drives with charts.

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Bend Allowance Calculator – Sheet Metal Bending

Calculate bend allowance and bend deduction for sheet metal fabrication with automatic K-factor estimation. Get flat pattern dimensions, bend angles, inside radius, and material thickness results for precise metal bending operations.

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Bernoulli Equation Calculator – Fluid Dynamics

Solve the Bernoulli equation to compare pressure, velocity, and height at two points along a streamline for fluid flow in pipes, ducts, and open channels with charts.

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Binoculars Range Calculator – Distance Estimation

Estimate distance to an object using binocular mil-dot reticle ranging. Perfect for hunting, birdwatching, marine navigation, and tactical field observation.

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Black Hole Calculator – Schwarzschild Radius

Calculate Schwarzschild radius, gravitational acceleration, and density of any black hole from its mass. Free astrophysics calculator with charts, breakdowns.

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Black Hole Temperature Calculator – Hawking Radiation

Calculate Hawking temperature of a black hole from its mass using T = ħc³ / 8πGMk_B. Free astrophysics calculator with evaporation timescales, Schwarzschild radius, and interactive temperature curves.

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Blast Radius Calculator

Calculate blast radius from explosive detonations using the Hopkinson-Cranz scaling law. Get safety distances for bare and fragmenting munitions.

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BTU to Tons Converter

Convert BTU per hour to tons of refrigeration, watts, and other power units instantly. Free online converter for HVAC, air conditioning, and refrigeration capacity calculations.

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Bullet Energy Calculator

Calculate bullet kinetic energy using E = ½mv². Enter mass and velocity for muzzle energy results with charts and breakdowns for physics and ballistics.

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Cloud Base Altitude Calculator

Calculate cloud base altitude from temperature and dew point using the adiabatic lapse rate formula. Get cloud height in meters and feet, cloud temperature, and temperature spread with interactive charts for meteorology and aviation planning.

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Cube Density Calculator — ρ = m / a³

Calculate cube density from mass and side length ρ = m/a³. Free physics calculator with kg/m³ results, breakdowns, and charts for students and engineers.

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Density, Mass, and Volume Calculator — ρ = m/V Density Triangle

Calculate density, mass, or volume using the density triangle formula ρ = m/V. Free online physics calculator — enter any two values to compute the third with charts and breakdown tables.

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Elongation Calculator

Calculate axial elongation (ΔL), strain (ε), and stress (σ) using Hooke's law for prismatic members. Enter force, length, area, and Young's modulus for instant structural deformation results.

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E=mc² Calculator — Mass-Energy Equivalence

Calculate the energy equivalent of any mass using Einstein's E = mc². Enter mass in kg to get rest energy in joules, megajoules, kWh, and tons of TNT equivalent.

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Flat Vs Round Earth Calculator

Test three experiments to determine if the Earth is flat or round: sunset twice, disappearing objects, and stick shadows. Free online physics calculator with charts.

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Flywheel Energy Storage Calculator

Calculate rotational kinetic energy stored in a flywheel using E = 0.5mv squared. Free online physics calculator with charts and breakdown tables for students and engineers.

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Force Calculator

Calculate force using Newton's second law F = ma with mass and acceleration inputs. Get net force, weight, and breakdown tables with interactive physics charts.

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Free Fall with Air Resistance Calculator — Terminal Velocity & Drag Force

Calculate free fall with air resistance using mass, height, gravity, and drag coefficient k. Get terminal velocity, fall time, impact speed, and drag force with interactive physics charts.

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Free Fall Height Calculator — h = v₀t + ½gt²

Calculate free fall height from gravitational acceleration, initial velocity, and time of fall using h = v₀t + ½gt². Free online physics calculator for students and engineers.

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Free Fall Velocity Calculator

Calculate free fall velocity from height or time with v = √(2gh) and v = gt. Free online physics tool with velocity vs drop height charts for students.

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Free Space Path Loss

Calculate free space path loss (FSPL) for radio signals between antennas. Enter distance, frequency, and gains to get path loss in dB, wavelength, and attenuation analysis charts.

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Frequency Bandwidth Calculator — fBW = f₀ / Q

Calculate frequency bandwidth from center frequency and quality factor using fBW = f₀ / Q. Get upper and lower cutoff frequencies with interactive charts and step-by-step breakdown for RF engineering and signal processing.

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Frequency Of Light Calculator — f = c/λ

Calculate light frequency from its wavelength using f = c/λ. Get EM spectrum region, formatted results, and interactive charts with this free physics calculator.

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Gas Density Calculator — ρ = m/V

Calculate gas density from mass and volume using ρ = m/V. Free online physics calculator with interactive charts for students and thermodynamics professionals.

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Generator Power Calculator

Calculate power from work and time using the physics formula P = W/t. Free online generator power calculator with interactive charts, breakdowns, and instant results for students and engineers.

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Gold Weight Calculator

Calculate pure gold weight from total weight and karat purity (24K to 10K). Free gold calculator for jewelry, investments, and precious metals with charts.

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Grams to Cc Converter — Mass to Volume Using Density

Convert grams to cubic centimeters (cc) and vice versa using material density with 16 material presets including metals, water, glass, and concrete. Free online density converter with interactive charts.

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Ground Speed Calculator — Aviation Ground Speed, WCA & Heading

Calculate an aircraft ground speed from true airspeed wind speed course and wind direction using vector addition. Free online aviation navigation calculator with wind correction angle heading and interactive charts.

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Helical Coil Calculator - Inductance, Wire Length, Resonant Frequency

Calculate helical coil parameters: coil height H=N×(S+Dw), wire length Lw=N×√((πDc)²+S²), inductance via Wheeler formula, wire volume, and resonant frequency for physics and engineering.

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Hooke's Law Calculator

Calculate spring force using Hooke's Law F = kx and elastic potential energy PE = ½kx² with spring constant and displacement inputs. Free online physics calculator with charts and breakdown tables.

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Hoop Stress Calculator

Calculate hoop stress, longitudinal stress, and max shear stress in cylindrical and spherical pressure vessels using the thin-walled theory. Free online engineering calculator with interactive charts.

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HP to Amps Calculator

Convert hp to amps for DC and AC motors with efficiency and power factor. Free electrical calculator with interactive charts and accurate motor current results.

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Hydraulic Pressure Calculator

Calculate hydraulic pressure using Pascal's law P = F/A with force and area inputs. Free physics calculator with interactive charts and breakdown for students and engineers.

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Ideal Transformer

Calculate secondary voltage, current, apparent power, and efficiency for an ideal transformer from turns ratio. Free electrical engineering calculator with interactive charts and copper loss analysis.

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Impact Test

Calculate material energy absorption during Izod or Charpy pendulum impact tests. Get energy absorbed, impact velocity, and height with interactive charts.

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Insertion Loss Calculator – dB Signal Loss

Calculate insertion loss in dB from power or voltage measurements before and after inserting a two-port network. Free online RF signal integrity tool for engineers and technicians.

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Inverse Square Law

Calculate how intensity of light, sound, gravity, or radiation changes with distance using the inverse square law formula I₂ = I₁ × (r₁/r₂)². Free physics calculator with charts.

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J-Pole Antenna Calculator — Design Dimensions for Any Frequency

Calculate J-Pole antenna dimensions including long section, short section, feed point, and spacing for any frequency band. Free online antenna design tool with charts and breakdowns for ham radio operators and RF engineers.

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Kg To Newtons

Convert kilograms to newtons using F = m x g and gravity 9.80665 m/s squared. Free online weight-to-force converter with unit breakdowns and charts for physics.

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Kinetic Energy

Calculate kinetic energy with KE = ½mv² using mass (kg) and velocity (m/s). Get energy in joules, eV, calories, plus momentum and de Broglie wavelength.

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Length Contraction

Calculate relativistic length contraction using L = L₀√(1−v²/c²) with this free online physics calculator. Get Lorentz factor γ, observed contracted length, and contraction ratio with interactive charts for special relativity studies.

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Linear Actuator Force

Calculate linear actuator force for inclined or horizontal loads using Newton's second law. Free online tool with force component breakdown and charts.

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Lumen Calculator — Lumens, Candelas & Lux Converter

Online lumens, candelas, and lux converter with interactive charts. Free physics photometry calculator with sensitivity analysis and detailed breakdowns.

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Lux To Footcandle

Convert illuminance between lux (lx) and footcandles (fc) instantly using fc = lx / 10.76391. Free online light intensity converter for photography, lighting design, architecture, and engineering applications.

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Magnetic Permeability Calculator

Calculate magnetic permeability, relative permeability, and susceptibility for any substance using μ₀. Includes 14 presets from vacuum to mu-metal and custom entry.

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Mass To Density

Calculate density from mass and volume using the formula ρ = m/V. Free online density calculator with instant results, interactive charts, and step-by-step breakdown for physics students and professionals.

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Mean Free Path Calculator — Gas Molecule Collision Distance

Calculate the mean free path of gas molecules using temperature, pressure, and kinetic diameter. Free physics calculator with interactive charts for thermodynamics and kinetic theory.

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Mixing Ratio Of Air Calculator — Actual & Saturation

Calculate the actual and saturation mixing ratios of moist air from temperature, dew point, and station pressure using the Magnus formula. Free online meteorology physics calculator with charts.

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Moisture Content Calculator — Water Percentage in Materials

Calculate moisture content percentage of any material using wet weight and dry weight with the formula ((Wet − Dry) / Wet) × 100. Free online physics tool with breakdowns and charts for agriculture, food, and construction.

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Momentum Calculator (p = mv)

Calculate linear momentum using p = mv with mass (kg) and velocity (m/s) inputs. Free physics calculator for collision and impulse analysis with interactive charts and breakdowns.

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Muzzle Velocity Calculator

Calculate muzzle velocity using the formula v = d / t. Enter distance to target and bullet time of flight to compute projectile speed in m/s with interactive charts and detailed breakdowns for firearms, airsoft, and pellet guns.

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Noise Figure Calculator — NF from SNR

Calculate the noise figure (NF) from input and output signal-to-noise ratios using NF = 10 × log₁₀(SNRᵢ/SNRₒ). Free online NF calculator with charts and breakdowns for RF engineering, wireless communications, and signal processing.

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Number Density Calculator — Charge Carrier Density

Calculate charge carrier number density of metals using density, molar mass, and free electrons. Free online physics calculator with comparison charts and breakdowns for students and engineers.

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Optical Density (OD) Calculator

Calculate optical density (OD) from incident and transmitted light intensity. Free online OD calculator with absorbance, transmittance, charts, and breakdown.

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Particles Velocity Calculator

Calculate particle velocity using v = d/t formula. Enter distance in meters and time in seconds to get velocity in m/s with interactive charts and detailed breakdowns for physics students and kinematics problems.

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Pendulum Kinetic Energy

Calculate pendulum bob kinetic energy using KE = ½mv². Enter mass (kg) and velocity (m/s) to get kinetic energy in joules with interactive charts for physics students and educators.

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Piston Force Calculator — F = P × A

Calculate piston cylinder force from bore diameter and cylinder pressure using F = P × A. Free physics calculator with interactive charts for engineers.

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Potential Energy

Calculate gravitational potential energy using PE = m·g·h. Enter mass (kg) and height (m) to compute stored energy in joules and kilojoules with interactive charts and breakdown tables.

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Pounds Per Square Inch (PSI) Converter

Convert PSI pressure to bar, kPa, Pa, atm, mmHg, inHg, kg/cm², and MPa instantly with this free online pounds per square inch pressure converter for engineering and science.

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Pressure Calculator (P = F/A)

Calculate pressure using P = F/A from force and area inputs. Free online calculator with results in pascals (Pa) and kPa for physics and engineering uses.

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Prop Pitch Calculator — Boat Propeller Pitch and Speed

Calculate boat propeller pitch from desired speed or theoretical boat speed from known pitch, RPM, and gear ratio. Free online marine propeller pitch calculator for boat performance tuning and propeller selection analysis.

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Propeller Slip (Prop Slip) Calculator

Calculate boat propeller slip percentage from engine RPM, gear ratio, propeller pitch, and actual boat speed. Free online marine prop slip calculator for boat performance tuning and propeller selection analysis.

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Pulley Calculator — Belt Drive System

Calculate driven pulley RPM, belt velocity, belt length, belt tension, and torque for a two-pulley belt drive system with interactive charts and full breakdown tables.

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Quantum Number Calculator

Find all four quantum numbers (n, l, ml, ms) for any electron shell. Free online atomic physics calculator with orbital counts, max electron capacity, and full combinations table.

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Quarter Mile Calculator — Drag Racing ET and Trap Speed

Estimate your vehicle 1/4-mile elapsed time and trap speed from horsepower and weight using Huntington, Fox, and Hale empirical drag racing formulas. Free online automotive performance calculator with comparison charts.

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Reaction Time Calculator – Ruler Drop Reflex Test

Calculate your reaction time using the ruler drop experiment and the free fall formula t = √(2d/g). Measure reflexes with this free online physics calculator.

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Relative Humidity Calculator

Calculate relative humidity from air temperature and dew point using the Magnus formula. Free online physics calculator with comfort analysis and interactive charts.

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Resultant Force

Calculate net resultant force from multiple vectors via vector addition. Free physics calculator with component breakdown, interactive charts, and analysis.

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Resultant Velocity

Add two velocity vectors by magnitude and angle to find the resultant velocity, direction, and x/y components. Free physics calculator with interactive charts.

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RMS Speed Calculator — Gas Molecule Speed

Calculate root mean square speed of gas molecules using v_rms = √(3RT/M) from kinetic theory of gases. Free online RMS speed calculator with 10 gas presets, interactive comparison charts, and detailed formula breakdowns for physics and chemistry students and educators.

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RMS Voltage Calculator

Calculate RMS voltage for sine, square, triangle, sawtooth, half-wave, and full-wave rectified AC waveforms. Free online RMS voltage calculator with interactive charts and detailed breakdowns for electrical engineering and physics.

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Rocket Thrust Calculator

Calculate rocket engine thrust using F = v_e × m_dot + A_e × (P_e − P_amb). Free online physics calculator with interactive charts and detailed breakdowns for aerospace students and professionals.

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Rockwell Hardness Conversion Calculator — HRB HRC to HB HV

Convert Rockwell hardness numbers between HRB, HRC, Brinell HB, and Vickers HV scales. Free physics calculator with depth-to-hardness and cross-scale conversion.

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Root Mean Square Velocity Calculator — Gas Molecule Speed

Calculate RMS (root mean square) velocity of gas molecules using v_rms = √(3RT/M) from kinetic theory. Free online physics calculator with 15 common gas presets, interactive charts, and detailed breakdowns for students and researchers.

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Rotational Stiffness Calculator — k = M/θ

Calculate rotational stiffness from applied torque and rotation angle using k = M/θ. Free online engineering calculator with formula breakdown and interactive charts for mechanical and structural engineers.

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Rydberg Equation Calculator — Hydrogen Spectral Lines

Calculate photon wavelengths, frequencies, and energies for hydrogen and hydrogen-like atoms using the Rydberg formula 1/λ = RZ²(1/n₁² − 1/n₂²). Free online atomic physics calculator with spectral series identification and interactive charts.

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SCFM Calculator — Standard Cubic Feet per Minute

Convert actual cubic feet per minute (ACFM) to standard cubic feet per minute (SCFM) using temperature and pressure correction. Free online gas flow converter with interactive charts and step-by-step breakdowns for engineers, HVAC technicians, and pneumatics professionals worldwide.

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Series Resistor Calculator — Rₜ = R₁ + R₂ + ... + Rₙ

Calculate the equivalent resistance of resistors connected in series using R_total = R1 + R2 + ... + Rn. Free online series resistor calculator with interactive charts for electronics students, engineers, and hobbyists.

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Shear Modulus Calculator

Calculate the shear modulus (modulus of rigidity) of a material using G = FL/AΔx from force, area, length, and displacement or G = τ/γ from shear stress and shear strain. Free online physics and engineering calculator.

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Shear Strain Calculator

Calculate shear strain using γ = x/h from displacement, γ = τ/G from shear stress and modulus, or γ = cφ/L for shafts under torsion. Free online shear strain calculator for mechanics and engineering students with three calculation modes and interactive charts.

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Shear Stress Calculator

Calculate shear stress in beams using τ = VQ/It for transverse loads and in circular shafts using τ = 16T/πD³ for torsional loads. Free online shear stress calculator for mechanical and civil engineering with Pa, kPa, and MPa outputs and interactive charts.

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Shear Wave Velocity Calculator

Calculate shear wave velocity in materials using Vs = sqrt(G/ρ) from shear modulus and density. Free online physics calculator with material presets and charts.

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Signal to Noise Ratio (SNR) Calculator

Calculate signal-to-noise ratio in dB from power or voltage inputs with linear ratio and ENOB. Free SNR calculator for audio engineering and communications.

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Simple Harmonic Motion

Calculate SHM displacement, velocity, and acceleration using y = A·sin(ωt). Free SHM calculator with charts and formula breakdown for physics students.

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Simple Pendulum Calculator

Calculate the period and frequency of a simple pendulum using T=2π√(L/g). Enter pendulum length in meters to get oscillation period, frequency, and detailed physics breakdown—ideal for physics students, educators, and engineers studying harmonic motion.

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Skin Depth Calculator — δ = √(ρ / πfμ₀μᵣ)

Calculate skin depth in copper, aluminum, gold, silver, and nickel conductors using δ = √(ρ/πfμ₀μᵣ). Free online RF skin effect calculator with interactive charts.

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Slenderness Ratio Calculator — Column Buckling Analysis

Calculate column slenderness ratio λ = KL/r from length, end conditions, and cross-section. Free buckling analysis tool with radius of gyration and column class.

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Smartphone Projector Calculator — DIY Lens Setup

DIY smartphone projector using the thin lens equation. Enter screen size plus two of object distance, image distance, or focal length for magnification.

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Snell's Law Calculator — n₁ sin θ₁ = n₂ sin θ₂

Calculate the refraction angle using Snell's Law n₁ sin θ₁ = n₂ sin θ₂ with refractive index presets for air, water, glass, diamond, and common media.

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Sound Absorption Coefficient Calculator

Calculate the sound absorption coefficient (α) of any material using incident and absorbed sound intensities. Free online acoustics calculator with interactive energy distribution charts for soundproofing and acoustic treatment.

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Sound Wavelength Calculator

Calculate sound wavelength from velocity and frequency using the wave equation λ = v/f. Free online physics calculator for acoustics, music, and engineering with instant results and charts.

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Specific Impulse Calculator – Rocket Engine Performance

Calculate specific impulse Isp = F/(ṁ×g₀) for rocket engines from thrust and mass flow rate. Get exhaust velocity and thrust power with interactive charts.

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Speed Of Light Calculator

Calculate how far light travels in any given time using the constant c = 299,792,458 m/s. Free physics calculator with results in meters, kilometers, and miles.

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Speed Of Sound Calculator

Calculate the speed of sound in dry air using c = sqrt(γRT) at any temperature. Free online physics calculator with instant results in m/s, km/h, ft/s, mph, and knots.

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Speed of Sound in Solids Calculator

Calculate speed of sound in solids from Young's modulus and density. Get P-wave and S-wave speeds for steel, aluminum, copper, and custom materials with charts and breakdowns.

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Speeds And Feeds Calculator — Machining RPM & Feed Rate

Calculate spindle speed in RPM and feed rate for drilling, milling, and turning using cutting speed, tool diameter, teeth count, and chip load per tooth for machining.

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Sphere Density Calculator

Calculate the density of a sphere using mass and radius with the formula ρ = m / (4/3 × π × r³). Free online physics calculator with instant results, interactive charts, and step-by-step breakdown.

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Spherical Capacitor Calculator

Calculate the capacitance of a concentric spherical capacitor using the formula C = 4pi*epsilon_0*epsilon_r * (r1*r2)/(r2 - r1). Get capacitance, stored charge, and energy with interactive charts.

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Spring Calculator — Hooke's Law & SHM

Calculate spring force using Hooke's Law F = k·x, elastic potential energy EPE = ½k·x², and SHM parameters — angular frequency, frequency, period, max velocity, and max acceleration for any spring-mass system.

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Spring Rate Calculator

Calculate the spring constant k of a helical coil spring from shear modulus, wire diameter, outer diameter, end type, and coil count. Free online spring rate calculator with charts and unit conversions.

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Spring Rate Converter

Convert spring rate units between N/m, N/mm, kN/m, lbf/in, lbf/ft, kgf/cm, and ozf/in instantly. Free online spring constant converter with comparison chart and breakdown table for engineers and DIY enthusiasts.

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Stefan-Boltzmann Law Calculator

Calculate blackbody thermal radiation power using the Stefan-Boltzmann law P = σ × ε × A × T⁴. Enter area, temperature, and emissivity to compute radiated power in watts.

📐

Stiffness Matrix Calculator — Element Stiffness for FEA

Compute element stiffness matrices for truss, beam, and frame elements used in finite element analysis. Enter Youngs modulus, area, moment of inertia, and length to get the full [K] matrix with charts and breakdowns.

⚪

Stokes Law

Calculate terminal velocity of a spherical particle falling through a viscous fluid using Stokes law. Free online physics calculator with material presets, drag force, and Reynolds number breakdown.

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Stopping Distance

Calculate vehicle stopping distance from speed, reaction time, road grade, and surface friction using the AASHTO formula. Free online physics calculator with charts and breakdowns for drivers, engineers, and students.

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Stress Calculator — Mechanical Stress σ = F/A

Calculate axial mechanical stress (σ = F/A), strain (ε = ΔL/L₀), and Young's modulus with material comparison charts across 26 engineering materials. Free online physics calculator for engineering and mechanics.

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Stress Concentration Factor Calculator

Calculate the stress concentration factor Kt for geometric discontinuities including elliptical holes and anisotropic composite materials. Free online engineering calculator with charts.

☀️

Sun Angle Calculator — Solar Elevation and Azimuth

Calculate solar elevation and azimuth angles for any location worldwide. Free sun position finder with charts for solar energy, architecture, and astronomy.

🌅

Sunrise Calculator — Compute Sunrise and Twilight Times

Calculate exact sunrise time, civil dawn, nautical dawn, and astronomical dawn for any location using date, latitude, longitude, and timezone. Includes atmospheric refraction correction and day length.

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Sunrise Sunset Calculator

Calculate exact sunrise and sunset times for any location worldwide using date, latitude, longitude, and timezone. Includes atmospheric refraction correction, solar noon, and day length with charts.

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Sunset Calculator

Calculate the exact sunset time for any location worldwide using date, latitude, longitude, and timezone. Includes atmospheric refraction correction, twilight times, and day length with interactive charts.

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Surface Tension Calculator — Physics Surface Tension of Liquids

Calculate surface tension in droplets, bubbles, jets, and flat surfaces using physics formulas. Free online calculator with interactive charts and breakdowns for students and engineers.

📐

SUVAT Calculator — Equations of Motion

Solve SUVAT equations of motion for constant acceleration. Enter any 3 of 5 kinematic variables to compute the remaining unknowns with instant results, charts, and breakdowns.

🪐

Synodic Period Calculator

Calculate the synodic period of any planet using the formula 1/P_syn = |1/P_sid − 1/P_ref|. Free online astronomy calculator with planet presets and charts.

📏

Telescope Field of View Calculator

Calculate the true field of view of any telescope-eyepiece combination using apparent FOV and magnification. Free online astronomy calculator with interactive charts and breakdowns.

📏

Telescope Magnification Calculator

Calculate telescope magnification, resolving power, field of view, and exit pupil from aperture, f-ratio, and eyepiece specs. Free online astronomy calculator with interactive charts for stargazers.

🪢

Tension Calculator — Find Tension Force in Ropes

Calculate tension force in ropes suspending an object using mass, gravity, and rope angles. Free online physics tension calculator with interactive charts.

💨

Terminal Velocity Calculator

Calculate terminal velocity of a free-falling object using mass, cross-sectional area, and drag coefficient with the physics formula vt = sqrt(2mg/ρACd). Free online physics calculator with charts and breakdowns.

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Thermal Conductivity Calculator

Calculate heat flux through materials using Fourier law q = λ·ΔT/Δx with material presets for copper, brick, glass, wood, and more. Free online physics heat transfer calculator with charts and breakdowns.

🔥

Thermal Diffusivity Calculator

Calculate thermal diffusivity of materials using α = k/(ρ·cₚ) with material presets for copper, gold, silver, aluminum, water, air, wood, and rubber. Free online physics heat transfer calculator with charts and breakdowns.

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Thermal Efficiency Calculator

Calculate thermal efficiency of heat engines using η = 1 − Q_out/Q_in for real engines or η = 1 − T_c/T_h for Carnot cycles. Free online physics calculator with charts and breakdowns.

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Thermal Energy Calculator — Kinetic Theory of Gases

Calculate the average kinetic energy of gas molecules, average velocity, and total thermal energy of an ideal gas using Boltzmann constant and the kinetic molecular theory. Free online physics calculator with interactive charts and step-by-step breakdowns.

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Thermal Equilibrium Calculator

Calculate the final equilibrium temperature when two objects at different temperatures exchange heat via Q = mcΔT. Free online physics calculator with material presets, heat transfer results, and interactive comparison charts.

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Thermal Expansion Calculator

Calculate linear and volumetric thermal expansion of materials using ΔL = α·L₀·ΔT and ΔV = 3α·V₀·ΔT. Free online physics calculator with material presets, charts, and step-by-step breakdowns.

🌡️

Thermal Resistance Calculator

Calculate thermal resistance of plates, cylinders, and spheres using R = t/(kA), ln(r₂/r₁)/(2πLk), and (r₂−r₁)/(4πr₁r₂k). Free online heat transfer calculator with material database and charts.

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Thermal Stress Calculator

Calculate thermal stress and strain in constrained materials using σ = E × α × ΔT. Select from steel, aluminum, copper, brass, and more with preset material properties, interactive charts, and step-by-step breakdown for engineering and physics applications.

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Thermodynamic Processes Calculator — Ideal Gas Law & Combined Gas Law

Free online thermodynamic processes calculator for ideal gases — isochoric, isobaric, isothermal, and adiabatic. Compute final p, V, T, ΔU, W, and Q with interactive charts and breakdown tables for monatomic, diatomic, and polyatomic gases.

🌈

Thin Film Optics Calculator

Analyze thin film optical interference with OPD, Fresnel reflectivity (s-polarized and p-polarized), minimum AR coating thickness, and interference type using wavelength, incident angle, film thickness, and refractive indices.

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Thin Lens Equation

Thin Lens Equation Calculator — solve 1/f = 1/v + 1/u for object distance, image distance, focal length, and magnification. Free online physics optics calculator with interactive charts and step-by-step breakdown.

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Three Phase Power Calculator — Balanced AC Circuit Analysis

Calculate apparent, active, and reactive power for balanced three-phase AC circuits. Free online 3-phase calculator with charts, breakdowns, and Star/Delta analysis.

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Thrust-to-Weight Ratio Calculator

Calculate the thrust-to-weight ratio (TWR) of any rocket, jet, or vehicle using thrust in Newtons and mass in kilograms. Free online physics calculator with interactive charts and step-by-step breakdown.

⏱️

Time Dilation Calculator

Compute relativistic time dilation using Einstein formula Δt' = Δt/√(1−v²/c²). Enter proper time and observer velocity as fraction of c to get dilated time, Lorentz factor, time difference, and interactive comparison charts for physics students and enthusiasts.

⏱️

Time of Flight Projectile Motion

Calculate the time of flight of any projectile using initial velocity, launch angle, and launch height. Free online physics calculator with interactive trajectory chart showing flight duration, range, velocity components, and maximum height for kinematics problems.

💣

TNT Equivalent Calculator

Calculate TNT equivalent weight for any explosive using the heat of detonation ratio. Select from C4, RDX, HMX, PETN and more with interactive comparison charts.

❄️

Ton to kW Converter

Convert refrigeration tons to kilowatts (kW) instantly. Free HVAC cooling capacity converter using the standard formula 1 ton = 3.517 kW with charts.

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Torque Calculator

Calculate torque from force, lever arm, and angle using τ = r × F × sin(θ). Free physics calculator with interactive charts for rotational mechanics problems.

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Torsional Constant

Calculate torsional constant K of circular, square, rectangular, and elliptical sections. Free online physics calculator with step-by-step formula breakdowns.

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Torsional Spring

Calculate helical torsion spring torque, angular deflection, spring rate, and bending stress using wire diameter, coil diameter, active turns, material Young's modulus, applied force, and lever arm length. Free online engineering calculator with charts and breakdown.

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Torsional Stiffness

Calculate torsional stiffness of beams and shafts using k = GJ/L or k = T/φ. Free online engineering calculator with material selection, polar moment J, interactive charts, and step-by-step breakdowns for mechanical design.

🎯

Trajectory Projectile Motion Calculator

Plot the parabolic path of a projectile from velocity, angle, and height. Free physics calculator with interactive chart, flight time, range, and max height.

⚡

Transformer Sizing Calculator — kVA for Single & Three Phase

Calculate the minimum kVA for single-phase and three-phase transformers from load voltage and current. Free online sizing tool with standard recommendations.

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Transistor Biasing Calculator — BJT Bias Circuit Designer

Calculate BJT transistor DC bias for fixed, feedback, and voltage divider circuits. Free online electronics calculator with interactive charts and breakdowns.

⚙️

Transmission Gear Ratio Calculator — Vehicle Speed from RPM

Calculate vehicle speed from engine RPM, transmission gear ratio, differential ratio, and tire diameter. Free automotive calculator with interactive charts and breakdowns for gear ratio tuning and performance analysis.

🛩️

True Airspeed Calculator (E6B)

Calculate TAS from CAS, altitude, temp, and altimeter with the E6B formula. Free aviation calculator with pressure altitude, density altitude, Mach, and charts.

📏

True Strain Calculator

Convert engineering strain to true strain using ε_true = ln(1 + ε_eng). Calculate true stress from engineering stress with charts and formula breakdowns.

🔫

Twist Rate Calculator (Miller Twist Rule)

Calculate barrel twist rate for bullet stability using the Miller twist rule. Enter bullet mass, diameter, length, and gyroscopic stability factor to get the required rifling twist in inches per turn.

👽

UFO Travel Calculator — Design & Travel Time

Design your own UFO by choosing shape and engine, then calculate travel times to stars and galaxies. Free interactive performance tool with speed charts and breakdowns.

🌌

Universe Expansion Calculator — ΛCDM Model

Calculate universe age, composition, critical density, and fate with the ΛCDM model. Enter matter density Ωm, dark energy ΩΛ, and Hubble constant H₀ for instant cosmology results.

🌀

Valve Flow Coefficient (Cv) Calculator

Calculate valve flow coefficient Cv for liquids from flow rate, pressure drop, and specific gravity. Free online valve sizing tool with breakdowns and charts for piping system design.

⚗️

Van der Waals Equation Calculator

Calculate real gas pressure using the Van der Waals equation of state (P + a·n²/V²)(V − n·b) = nRT. Compare real vs ideal gas with interactive charts and breakdowns for chemistry and physics.

💨

Velocity Calculator — v = d/t

Calculate velocity and speed from distance and time using the physics formula v = d/t. Free online velocity calculator with instant m/s and km/h results, charts, and step-by-step breakdown for physics and kinematics problems.

🚀

Velocity Addition Calculator

Calculate relativistic velocity addition using Einsteins formula u = (v + w) / (1 + vw/c²). Free online calculator with interactive charts for special relativity velocity problems.

💎

Vickers Hardness Number Calculator

Calculate Vickers Hardness Number (HV) from force and indentation diagonal. Free calculator with surface hardness in MPa/GPa and tensile strength for metals.

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Virtual Temperature Calculator

Calculate virtual temperature of moist air from air temperature and mixing ratio. Essential for CAPE, atmospheric density, and severe weather assessment in meteorology.

⚡

Voltage Divider Calculator — Vout and Power

Calculate Vout of a resistive divider using Vout = Vin x R2 / (R1 + R2). Free online calculator with current, power, and charts for electronics design.

⚡

Voltage Regulation Calculator

Calculate step-down and step-up voltage regulation of linear and switching regulators using no-load and full-load voltage inputs with interactive charts.

⚡

Volts to Electron Volts Calculator

Convert volts (V) to electron volts (eV) instantly using our free online calculator. Enter voltage and charge in elementary charges or coulombs for accurate results with charts.

🧪

Volume To Density

Calculate density from mass and volume (ρ = m/V). Get results in kg/m³, g/cm³, and lb/ft³ with automatic material classification alongside 16 reference materials.

⚖️

Volume to Mass Calculator

Convert volume to mass using density with the formula mass = density × volume. Choose from 12 materials like water, aluminum, gold, and steel or enter a custom density in kg/m³.

⚖️

Von Mises Stress

Calculate Von Mises equivalent stress from principal stresses using the distortion energy failure criterion. Free online calculator with stress component breakdown and interactive charts for mechanical engineering and materials science.

〰️

VSWR Calculator — Voltage Standing Wave Ratio

Calculate VSWR, reflection coefficient, return loss, and mismatch loss from impedance or direct input. Free RF transmission line calculator with charts.

🛸

Warp Speed Calculator — Starship Velocity from Warp Factor

Calculate starship velocity from warp factor using TOS (w³) and TNG (w^(10/3)) equations. Free warp speed calculator with interactive charts and travel time estimates.

💧

Water Density Calculator

Calculate water density at any temperature from 0°C to 100°C with optional salinity correction. Get density in kg/m³, g/ml, and lb/ft³ with a float/sink table.

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Water Heating Calculator — Energy to Heat Water

Calculate the energy required to heat water using Q = mcΔT. Get results in joules, kWh, and BTU with heating time and cost estimates for any temperature change.

🌊

Water Pressure At Depth

Calculate water pressure at any depth using hydrostatic formula P = ρgh. Get gauge and absolute pressure in Pa, kPa, bar, atm, and psi for freshwater or seawater.

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Water Viscosity Calculator — Dynamic & Kinematic Viscosity

Calculate water dynamic viscosity (mPa·s), kinematic viscosity (mm²/s), and density (g/cm³) at any temperature from 0°C to 100°C. Free water viscosity calculator with charts and detailed results.

⚡

Watt Calculator — Power from Work and Time

Calculate power in watts from work done and time taken using P = W / t. Free online physics power calculator with charts, breakdowns, and step-by-step results.

⚡

Watt Converter

Convert between watts, kilowatts, megawatts, horsepower, BTU/h, and 14 power units. Free online watt converter with charts, calculations, and detailed breakdowns.

🔋

Watt Hours Calculator — Convert Ah to Wh or W to Wh

Calculate energy in watt-hours from amp-hours and voltage using Wh = Ah × V or from power and time using Wh = W × h. Free online watt-hour calculator for battery capacity and energy consumption analysis with interactive charts and breakdowns.

⚡

Wattage to Amperage Calculator — Convert Power to Current

Convert watts to amps for DC, AC single-phase, and AC three-phase circuits using the I = P/V formula. Free online wattage-to-amperage calculator with charts and breakdowns.

⚡

Watts to Amps Calculator — Convert Power to Current

Convert watts to amps for DC, AC single-phase, and AC three-phase circuits using I = P/V formula. Enter power and voltage for instant current results with charts.

🔥

Watts To Heat

Convert electrical power in watts to heat energy in joules, BTU, and kWh using Q = P × t. Free online physics energy conversion calculator with charts and breakdowns.

💡

Watts To Lux Calculator — Power to Illuminance

Convert watts to lux using luminous efficacy and surface area. Free online illuminance calculator with presets for LED, CFL, halogen, and incandescent bulbs with comparison charts.

🌊

Wave Speed Calculator — v = f × λ

Calculate wave speed from frequency and wavelength using the formula v = f × λ. Free physics calculator for sound, light, and mechanical waves with charts and breakdowns.

🌊

Wave Velocity Calculator — v = f × λ

Calculate wave velocity from frequency and wavelength using v = f × λ. Free physics calculator for sound, light, and mechanical waves with charts and breakdowns.

🌊

Wavelength Calculator — λ = c/f

Calculate wavelength from frequency using λ=c/f with the speed of light constant. Free physics calculator with meters, nanometers, charts, and breakdowns.

⚛️

Wavelength To Energy

Convert photon wavelength to energy in joules and eV using Planck's equation E = hc/λ. Free online physics calculator with frequency, wavenumber, charts, and breakdowns for spectroscopy and quantum mechanics.

📡

Wavelength To Frequency Calculator — Convert λ to f

Convert wavelength to frequency with wave velocity using f = v/λ. Free online physics calculator with charts, breakdowns, and support for light, sound, and custom waves.

🌊

Wavenumber

Calculate wavenumber from wave velocity and frequency using ν̄ = f/v. Free physics calculator with charts and breakdowns for spectroscopy and wave analysis.

🪐

Weight on Other Planets Calculator

Calculate your weight on Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune. Enter your Earth weight and see gravity changes across the solar system.

🌡️

Wet Bulb Calculator — Stull Formula

Calculate wet-bulb temperature from air temperature and relative humidity using the Stull formula. Free online physics calculator with dew point, WBGT, charts, and breakdowns for meteorology, HVAC, and heat safety.

🔌

Wheatstone Bridge Calculator — Unknown Resistance & Output Voltage

Calculate unknown resistance using the Wheatstone bridge balanced formula Rx = (R2/R1) × R3, or compute output voltage of an unbalanced bridge circuit. Free online electronics calculator with charts and breakdowns.

🌡️

Wien's Law Calculator — Blackbody Peak Wavelength & Temperature

Calculate the peak wavelength of blackbody radiation from temperature using Wien's displacement law. Free online physics tool with Planck spectrum chart and photon energy results.

✈️

Wind Correction Angle Calculator

Calculate the wind correction angle (WCA) and heading for any aircraft using true airspeed, course, wind speed, and wind direction. Free online aviation calculator with vector analysis, charts, and ground speed results for pilots and flight planning.

✈️

Wing Loading Calculator — Aircraft Aerodynamics

Calculate wing loading (WL = W/S) and wing cube loading (WCL = W/S^1.5) for any aircraft. Free online aerodynamics tool with charts and breakdowns for pilots and engineers.

🔌

Wire Gauge Calculator — AWG/SWG to Diameter, Area, and Resistance

Convert AWG and SWG wire gauge to diameter (mm/in), cross-sectional area (mm²/kcmil), and electrical resistance per unit length (Ω/m, Ω/kft). Free online wire gauge converter with material presets for copper, aluminum, silver, gold, and more.

⚡

Wire Resistance Calculator

Calculate wire resistance using Pouillet's Law R = ρL/A. Select from copper, aluminum, silver, gold, and other conductor materials. Get resistance, conductance, and interactive charts for any wire size and length.

⚡

Wire Size Calculator

Determine correct electrical wire gauge (AWG) for DC, AC single-phase, and three-phase circuits based on current, voltage, distance, and conductor material.

⚙️

Work Calculator

Calculate work done by a force using W = F × d × cos(θ) with force, distance, and angle inputs. Free online physics work calculator for mechanics problems with interactive charts and step-by-step breakdowns.

⚡

Work and Power Calculator

Calculate work, time, or power using the physics formula P = W/t. Enter any two values to get the third instantly with interactive charts and step-by-step physics breakdowns.

🧊

Young's Modulus Calculator — Modulus of Elasticity

Calculate Young's modulus (modulus of elasticity) from force, area, and deformation using the stress-strain formula E = σ/ε. Free online physics calculator with material comparison and interactive charts.

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Y-Plus (y⁺) Calculator

Calculate first cell height for CFD meshing using y⁺ wall distance. Compute Reynolds number, skin friction, and wall distance for turbulent boundary layer flow.

⚛️

LHC Span Calculator – Large Hadron Collider Beam Parameters

Calculate LHC beam parameters: momentum, bending radius, Lorentz factor, velocity, revolution frequency, and beam rigidity from energy and magnetic field.

🔍

Lens Magnification Calculator

Calculate lens magnification using focal length and object distance with this free online optics tool. Get the magnification ratio, object distance, and image distance instantly with interactive charts and breakdowns for photographers and physics students.

〰️

Total Harmonic Distortion (THD) Calculator

Calculate total harmonic distortion (THD) from distortion attenuation in dB. Free online THD calculator for audio engineers and electronics enthusiasts with interactive charts and breakdowns.

🎯

Ballistic Coefficient Calculator

Calculate ballistic coefficient from bullet weight, caliber, and G1 drag coefficient. Free BC calculator for trajectory prediction in shooting and ballistics analysis.

🏎️

Bank Angle

Calculate ideal banking angle for curves using velocity and radius with circular motion physics for road design, race tracks, and vehicle safety analysis

⚛️

Bohr Model Calculator

Calculate electron orbit radius, energy levels, and orbital velocity for hydrogen-like atoms using the Bohr model. Free online atomic physics calculator for quantum mechanics education and study.

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Boltzmann Factor

Calculate the Boltzmann factor exp(-ΔE/k_B T) for two energy states at thermal equilibrium. Free statistical mechanics calculator for molecular energy distribution, reaction rates, and thermodynamic analysis.

⬆️

Boost Converter Calculator

Calculate boost converter duty cycle, input current, and output current for DC-DC step-up power supply design. Free online electronics engineering tool for engineers and hobbyists.

⚡

Acceleration of Particle in Electric Field Calculator — a = qE/m

Calculate acceleration of a charged particle in a uniform electric field using the Lorentz force law a = qE/m for physics students, electronics engineers, and charged particle dynamics analysis

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Alfvén Velocity Calculator — Magnetohydrodynamic Wave Speed

Calculate the Alfvén velocity v = B/√(μ₀ρ) of magnetohydrodynamic waves in a magnetized plasma. Free online physics calculator with accurate m/s results, step-by-step breakdowns, and interactive charts for astrophysics, fusion research, and space physics.

⚡

Capacitance Calculator — Parallel Plate Capacitor C = ε₀εᵣA/d

Parallel plate capacitance calculator. Features 14 dielectric presets, charge Q=CV, energy E=½CV², and interactive material comparison charts for physics.

⚡

Capacitive Reactance Calculator — XC = 1/(2πfC)

Calculate capacitive reactance XC = 1/(2πfC) of a capacitor in AC circuits. Free online physics calculator with angular frequency, susceptance, interactive charts, and formula breakdown.

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Capacitive Transformerless Power Supply Calculator

Calculate the output voltage and input current of a capacitive transformerless power supply circuit. Enter AC RMS voltage, Zener voltage, capacitance, and resistance for instant DC power supply analysis with charts and breakdowns.

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Capacitor Calculator — Capacitance, Charge Q=CV, Energy E=½CV²

Calculate capacitor stored charge Q=CV, energy E=½CV², and decode standard 3-digit EIA capacitor codes with tolerance. Free online capacitor calculator for electronics and physics with interactive charts and breakdowns.

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Capacitor Charge Time Calculator — RC Circuit Charging Formula t = τ×ln(1−V/V₀)

Calculate how long it takes to charge a capacitor through a resistor using the RC time constant formula. Free online electronics and physics calculator with charging curves, breakdowns, and interactive charts.

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Capacitor Energy Calculator — Stored Electrostatic Energy E = ½CV²

Calculate the electrostatic energy stored in a capacitor using E = ½ × C × V². Free online capacitor energy calculator with stored charge, breakdowns, and interactive charts for electronics and physics.

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Capacitor Size Calculator — Required Capacitance C = 2E/V²

Calculate the required capacitor size (capacitance) from start-up energy and voltage using C = 2E / V². Free online capacitor sizing calculator with instant results, step-by-step breakdowns, and interactive charts for electronics and physics.

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Capacitors in Series Calculator — Equivalent Capacitance 1/C = 1/C₁ + 1/C₂ + ... + 1/Cₙ

Calculate total equivalent capacitance of capacitors in series using the reciprocal formula 1/C = 1/C₁ + ... + 1/Cₙ. Free online electronics and physics calculator with interactive charts, breakdowns, and stored energy computation.

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Conductivity to Resistivity Calculator — ρ = 1/σ

Convert electrical conductivity (σ) to resistivity (ρ) instantly using ρ = 1/σ. Free online physics calculator with material presets for silver, copper, gold, aluminum, and more.

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Coulomb's Law Calculator — Electrostatic Force F = k·q₁·q₂/r²

Calculate electrostatic force between two point charges using Coulomb's law F = k·q₁·q₂/r². Enter charges in coulombs and distance in meters for instant force in newtons with breakdowns and interactive charts.

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Curie Constant Calculator — Paramagnetic Material C = μ₀/(3k_B) × N/a³ × μ²

Calculate the Curie constant C = μ₀/(3k_B) × N/a³ × μ² for paramagnetic materials. Enter atoms per unit cell, lattice constant (nm), and magnetic moment (μ_B) for instant results with charts and detailed breakdowns.

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Curie's Law Calculator — M = C×B/T Paramagnetic Magnetization

Calculate paramagnetic magnetization using Curie's Law M = C×B/T. Enter Curie constant, magnetic field, and temperature for instant magnetic susceptibility and magnetization results with interactive charts and detailed breakdowns for physics students and researchers.

⚡

Current Divider Calculator — Iₓ = I × (Z_eq / Zₓ)

Calculate branch currents in parallel resistive, inductive, and capacitive circuits using the current divider rule Iₓ = I × (Z_eq / Zₓ). Free online physics calculator with interactive charts and detailed breakdowns for electrical engineering students and electronics professionals.

💫

Cyclotron Frequency Calculator — f_c = qB/(2πm)

Calculate the cyclotron frequency f_c = qB/(2πm) of a charged particle in a uniform magnetic field. Enter particle type and magnetic field strength for instant cyclotron frequency, angular frequency, and orbital period with interactive charts for physics students and researchers.

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DC Wire Size Calculator — A = 2IρL/V_drop

Calculate the recommended DC wire gauge (AWG) using the voltage drop formula A = 2×I×ρ×L/V_drop. Free online DC wire sizing calculator for automotive, marine, solar, and low-voltage electrical systems with material comparison charts.

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Debye Length Calculator — λD = √(ε₀k_BT/nₑe²) for Plasma & Electrolytes

Calculate the Debye screening length for plasmas using λD = √(ε₀k_BT/nₑe²) and for monovalent electrolyte solutions using λD = √(εᵣε₀k_BT/(2NₐIe²)). Free online physics calculator with interactive charts and detailed step-by-step breakdowns for plasma physics and electrochemistry.

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Delta to Wye Conversion Calculator — Δ-Y Resistor Network Transform

Convert between Delta (Δ) and Wye (Y) resistor networks instantly using the Δ-Y transformation formulas Ra, Rb, Rc to R1, R2, R3 and vice versa. Free online electrical engineering calculator with interactive comparison charts and step-by-step breakdowns for circuit analysis, three-phase power systems, and network simplification.

⚡

Dipole Moment Calculator — Electric Dipole p = qd

Calculate electric dipole moment using p = q × d where q is charge and d is separation distance. Free online physics calculator with torque, potential energy in external field, and interactive charts in C·m and Debye units.

⚡

Drift Velocity Calculator — v_d = I/(n × A × q)

Calculate drift velocity of charge carriers in a conductor using v_d = I/(n×A×q). Free online physics calculator with scientific notation, breakdowns, and interactive charts for students and engineers.

📡

EIRP Calculator — Effective Isotropic Radiated Power

Calculate Effective Isotropic Radiated Power (EIRP) using the formula EIRP = Tx − Lc + Ga. Enter transmitter power (dBm), cable loss (dB), and antenna gain (dBi) for instant EIRP, ERP, and watt results with charts.

💫

Electric Field of a Point Charge Calculator

Calculate the electric field magnitude of a point charge using E = kQ/r² with Coulomb's constant. Free online physics calculator with interactive charts and detailed breakdown for students and engineers.

⛓️

Electric Motor Torque Calculator — T = 60P / (2π × rpm)

Calculate electric motor torque from power and speed using T = 60P / (2π × rpm). Get synchronous speed, slip analysis, breakdown table, and interactive charts for AC and DC motors — free online physics tool.

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Electric Potential Calculator

Calculate electric potential at a point due to a point charge using V = kQ/r formula. Free online physics calculator with step-by-step breakdowns and charts.

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Electrical Mobility Calculator — Einstein-Smoluchowski Relation

Calculate the diffusion constant from electrical mobility using the Einstein-Smoluchowski relation D = μ·k_B·T/q. Free online physics calculator for charge carriers, drift velocity, and semiconductor analysis with interactive charts and step-by-step breakdowns.

⚡

Electrical Power Calculator — DC & AC Power from V, I, and PF

Calculate electrical power using P = V × I × pf for DC and AC circuits. Enter voltage, current, and power factor to get real power, apparent power, reactive power, and interactive charts for physics and electronics.

💨

Electron Speed Calculator — Electron Velocity from Voltage

Calculate the speed of an electron accelerated through a potential difference using v = √(2eV/m). Free online physics calculator with classical and relativistic velocities, kinetic energy, and interactive velocity comparison charts.

⚡

Energy Density of Electric and Magnetic Fields Calculator

Calculate energy density of electric and magnetic fields using u = ½ε₀E² + ½B²/μ₀. Free online physics calculator with accurate J/m³ results, interactive charts, and breakdown tables for electromagnetism students and professionals.

⚡

Excess Electrons Calculator — n = Q / e

Calculate the number of excess electrons from an electric charge using the formula n = Q / e, where e = 1.602176634 × 10⁻¹⁹ C. Free online physics calculator for students and professionals.

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Faraday's Law Calculator — Electromagnetic Induction

Calculate induced EMF using Faraday's law: ε = -N dΦ/dt. Enter coil area, turns, magnetic field, and time for voltage results with charts.

🧲

Gauss's Law Calculator — Electric Flux Φ = Q/ε₀

Calculate electric flux using Gauss's law Φ = Q/ε₀ with vacuum permittivity. Free online electromagnetism calculator with charge, flux, and breakdown results.

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Hall Coefficient Calculator — R_H = V·t/(I·B)

Calculate the Hall coefficient R_H using the formula R_H = V·t/(I·B). Free online Hall effect calculator with carrier concentration, carrier type analysis, and interactive charts.

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Inductive Reactance Calculator — XL = 2πfL

Calculate inductive reactance XL = 2πfL of an inductor in AC circuits. Free online electronics calculator with interactive charts, formula breakdown, and admittance results.

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Inductor Energy Calculator

Calculate magnetic energy stored in an inductor using E = ½LI². Free online physics calculator with interactive charts, formula breakdown, and accurate joule results for students and engineers.

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Internal Resistance Calculator

Calculate battery internal resistance using r = ε/I − R. Free physics calculator finds terminal voltage, power dissipated in load and internally with charts.

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Joule Heating Calculator — Q = I²Rt

Calculate heat generated by electrical current in a conductor using Joule's first law Q = I²Rt. Free online Joule heating calculator with power dissipation in watts, kWh, and calories.

⚡

kVA Calculator — Apparent Power & kW Conversion

Calculate apparent power in kilovolt-amperes (kVA) from voltage and current for single-phase and three-phase AC systems. Free kVA calculator with kW conversion and power factor support.

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Lorentz Force Calculator — F = qvB sin(α)

Calculate the magnetic force on a moving charged particle using F = qvB sin(α). Free online electromagnetism calculator with instant Newtons results, interactive charts, and detailed formula breakdown.

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Magnetic Declination Calculator — True North vs Magnetic North

Find magnetic declination between true north and magnetic north at any location. Free geomagnetic calculator with interactive charts and field breakdown.

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Magnetic Dipole Moment Calculator — Loop & Solenoid

Calculate magnetic dipole moment of a current loop or solenoid using μ = N×I×A. Free online physics calculator with interactive charts and A·m² results.

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Magnetic Field Of Straight Current Carrying Wire Calculator

Calculate the magnetic field around a long straight wire using B = μ₀I/(2πd). Free online electromagnetism calculator with instant Tesla results, interactive charts, and detailed formula breakdown.

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Magnetic Force Between Wires

Calculate the magnetic force between two parallel current-carrying wires using F/L = μ₀I₁I₂/(2πd). Free online electromagnetism calculator with instant Newtons results, interactive charts, and detailed formula breakdown.

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Magnetic Force On Current Carrying Wire

Calculate the magnetic force on a current-carrying wire using F = BIL sin(α). Free online electromagnetic force calculator with instant Newtons results, interactive charts, and detailed breakdowns for physics.

⚡

Ohm's Law Current Calculator — I = V/R

Calculate electric current using Ohm's Law I = V/R. Enter voltage and resistance to find current in amperes with interactive charts and detailed breakdowns for physics students, hobbyists, and electronics engineers.

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Ohm's Law Power Calculator — P = V × I

Calculate electrical power using Ohm's Law P = V × I = I²R = V²/R. Enter any two values of voltage, current, or resistance to find power in watts with interactive charts.

⚡

Ohm's Law Resistance Calculator — R = V/I

Calculate the resistance of a conductor using Ohm's Law R = V/I. Enter voltage and current to find resistance in ohms with interactive charts and detailed breakdowns for physics students, hobbyists, and engineers.

⚡

Parallel Capacitor Calculator — Equivalent Capacitance in Parallel

Calculate the equivalent capacitance of capacitors connected in parallel using C_total = C1 + C2 + ... + Cn. Free online parallel capacitor calculator with interactive charts, breakdowns, and stored energy computation for students and electronics engineers.

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Parallel Inductors Calculator

Calculate equivalent inductance of inductors in parallel using the reciprocal formula 1/L = 1/L1 + 1/L2 + ... + 1/Ln. Free online parallel inductor calculator with charts and breakdowns for students and engineers.

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Parallel Resistor Calculator

Calculate the equivalent resistance of resistors connected in parallel using 1/R = 1/R1 + 1/R2 + ... + 1/Rn. Free online parallel resistor calculator with charts and detailed breakdowns for students and electronics engineers.

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Power Dissipation Calculator — Series and Parallel Circuits

Calculate power dissipated by resistors in series and parallel circuits using Joule's law P = I²R. Free online power dissipation calculator with per-resistor breakdowns and interactive charts.

⚡

Power Factor Calculator

Calculate the AC power factor (cos φ) from real power and apparent power using PF = P/S. Free online power factor calculator with reactive power, phase angle, and interactive power triangle charts for electrical engineering.

⚡

RLC Impedance Calculator

Calculate series and parallel RLC circuit impedance, phase angle, quality factor, and resonant frequency with interactive charts and detailed formula breakdown.

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Series Inductors Calculator

Calculate the total equivalent inductance of inductors connected in series using L_total = L1 + L2 + ... + Ln. Free online physics calculator with interactive charts and per-inductor breakdowns for electronics students, engineers, and circuit designers.

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Solenoid Inductance Calculator — L = μ₀N²A/l

Calculate the self-inductance of an air-core solenoid using L = μ₀N²A/l. Free online physics calculator with results in henries, formula breakdown, and interactive charts for electronics engineering and electromagnetism.

🧲

Solenoid Magnetic Field Calculator — B = μ₀NI/L

Calculate the magnetic field inside a solenoid using B = μ₀NI/L. Free online physics calculator with results in Tesla and Gauss, formula breakdown, and interactive charts.

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220V Wire Size Calculator — Find Correct Wire Gauge (AWG)

Find the correct wire gauge (AWG) for 220V circuits using NEC voltage drop formulas. Free online electrical wire sizing calculator for single-phase and three-phase systems.

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Amp To Wire Size Calculator — Find Correct Wire Gauge (AWG) by Current

Find the correct wire gauge (AWG) for any electrical circuit based on current, voltage, distance, and conductor material using NEC voltage drop formulas. Free online amp to wire size calculator.

🔺

Amplification Gain Calculator — Voltage, Current & Power Gain in dB

Calculate voltage, current, and power amplification gain in ratio and dB. Free online amplifier gain calculator with signal comparison charts for electronics and physics.

⚡

Breaker Size Calculator — Correct Circuit Breaker Rating

Calculate the correct circuit breaker size for DC and AC circuits using total appliance wattage, voltage, and power factor. Free online electrical breaker sizing calculator with 125% NEC derating factor, instant results, breakdowns, and charts.

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Bridge Rectifier Calculator — Full-Wave AC-to-DC Converter

Calculate DC output voltage, current, ripple factor, and PIV for a full-wave bridge rectifier circuit. Free online electronics calculator with step-by-step formulas and charts.

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Buck Converter Calculator — DC-DC Step-Down Duty Cycle & Inductance

Calculate the duty cycle and inductance for a buck converter DC-DC step-down circuit using input voltage, output voltage, switching frequency, and ripple current. Free online SMPS design calculator for electronics engineers and hobbyists.

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Cutoff Frequency Calculator — RC and RL Filter f_c = 1/(2πRC)

Calculate the cutoff frequency of RC and RL filter circuits. Free physics calculator with time constant, angular cutoff frequency, interactive charts, and step-by-step formula breakdowns for electronics students and engineers.

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Dipole Antenna Length Calculator — L = 468/f for Half-Wave Dipole

Free half-wave dipole antenna length calculator. Uses L = 468/f (feet) or 142.65/f (meters). Get wavelength, half-wave, charts, and breakdowns for ham radio.

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Flyback Converter Calculator — DC-DC Converter Design

Design a flyback converter DC-DC power supply: calculate duty cycle D, peak currents Ip and Is, and primary/secondary inductance from input voltage, output voltage, windings ratio, output current, and switching frequency.

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Forward Converter Calculator — DC-DC Converter Design

Design a forward converter DC-DC power supply: calculate output voltage Vout = D × Vin / N and ripple current from input voltage, duty cycle, transformer turns ratio, switching frequency, and inductance.

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High Pass Filter Calculator — RC and RL Cutoff Frequency

Calculate RC and RL high-pass filter cutoff frequency using fc=1/(2πRC) and fc=R/(2πL). Free online high-pass filter calculator with Bode plot and gain analysis for electronics and audio engineering.

⚛️

Intrinsic Carrier Concentration Calculator

Calculate intrinsic carrier concentration (ni) in semiconductors using band gap, effective masses, and temperature. Supports Si, Ge, GaAs, and custom materials.

⬇️

Inverting Buck-Boost Converter Calculator

Calculate duty cycle and inductance for inverting buck-boost converters from input voltage, output voltage, and switching frequency. Free DC-DC design tool.

⚡

kVA to Amperage Calculator — Convert kVA to Amps

Convert apparent power in kilovolt-amperes (kVA) to electric current in amperes (A) for single-phase and 3-phase AC systems. Free online kVA to amps calculator with formula breakdown and comparison charts for electrical engineering.

〰️

LC Filter Calculator — Cutoff Frequency of Inductor-Capacitor Circuit

Calculate the cutoff frequency of an LC low-pass or high-pass filter circuit using fc = 1/(2π√(LC)). Free online LC filter calculator with frequency response chart, gain analysis, and detailed breakdowns for electronics engineers and physics students.

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LED Resistor Calculator — Current-Limiting Resistor for LED Circuits

Calculate the current-limiting resistor for single or multiple LEDs in series and parallel circuits. Enter supply voltage, forward voltage, and current to find exact resistance, closest E12 value, and power dissipation for safe LED operation.

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Low Pass Filter Calculator — RC and RL Cutoff Frequency

Calculate RC and RL low-pass filter cutoff frequency using fc=1/(2πRC) and fc=R/(2πL). Free filter calculator with Bode plot and gain analysis for electronics.

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MOSFET Calculator — Drain Current & Operating Region

Calculate MOSFET drain current in cut-off, triode, and saturation regions using threshold voltage, K parameter, and bias voltages. Free online semiconductor calculator with I-V characteristic charts for engineers and students.

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MOSFET Threshold Voltage Calculator — V_T from C₀, N_A & φ_F

Calculate the threshold voltage of a MOSFET using oxide capacitance, doping concentration, and surface potential. Free online semiconductor calculator with interactive body-effect charts and detailed parameter breakdowns for engineers and students.

⏱️

NE555 Astable Multivibrator Calculator — Frequency & Duty Cycle

Calculate NE555 astable multivibrator frequency, period, time high, time low, and duty cycle from R1, R2, and C. Free online 555 timer calculator with charts for electronics hobbyists and engineers.

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Photon Detection Efficiency (PDE) Calculator — SiPM Detector

Calculate SiPM photon detection efficiency using PDE = R·h·c/(e·λ·G·(1+P_XT)·(1+P_AP)). Analyze gain, wavelength, and responsivity effects with interactive charts.

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RC Circuit Calculator

Calculate the characteristic frequency, angular frequency, and time constant of an RC circuit from resistance and capacitance values. Free online physics calculator with interactive charts and formula breakdown.

〰️

RC Filter Calculator — Cutoff Frequency and Bode Plot

Calculate the cutoff frequency, time constant, and frequency response of an RC low-pass or high-pass filter circuit. Free online RC filter calculator with interactive Bode plot charts for electronics engineers and physics students.

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Resistor Color Code

Decode 4-band, 5-band, and 6-band resistor color codes to find resistance value, tolerance, and temperature coefficient. Free online calculator for electronics engineering and hobbyists.

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Resistor Noise Calculator — Johnson-Nyquist Thermal Noise

Calculate RMS noise voltage of a resistor using Johnson-Nyquist formula E = √(4·R·k_B·T·Δf). Free online resistor noise calculator with charts and breakdown for electronics engineers and physics students.

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Resistor Wattage Calculator

Calculate power dissipated by a resistor using P = V²/R, P = I²×R, or P = V×I. Enter any two values of voltage, current, or resistance to compute resistor wattage instantly.

⚡

Resonant Frequency LC Calculator

Calculate the resonant frequency of an LC inductor-capacitor circuit using f = 1/(2π√(LC)). Free online calculator with angular frequency, reactance at resonance, interactive charts, and detailed formula breakdowns for electronics engineers and physics students.

⚡

RLC Circuit Calculator

Calculate the resonant frequency, angular frequency, and Q-factor of an RLC circuit from resistance, inductance, and capacitance values. Free online RLC circuit calculator with frequency response charts and parameter breakdowns for electronics engineers and physics students.

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Shockley Diode Calculator

Calculate diode current via the Shockley equation I = I_S(e^(V_D/(nV_T)) − 1). Free online I-V curve calculator for electronics and semiconductor physics.

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Broad Crested Weir Calculator — Discharge & Flow Rate Q = C·L·H³/²

Calculate discharge over a broad-crested weir using Q = C × L × H³/². Free online hydrology calculator for open channel flow, stream gauging, and hydraulic structure design.

⛵

Buoyancy Calculator — Buoyant Force & Displaced Mass

Calculate buoyant force using Archimedes' principle B = ρVg. Enter fluid density and volume for instant buoyancy force and displaced mass with physics charts.

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Buoyancy Experiment Calculator — Archimedes Principle Experiment

Calculate buoyant force, displaced volume, and object density using Archimedes principle. Enter mass in air and apparent mass in water for physics results with charts.

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Buoyant Force Calculator — Archimedes' Principle F = ρgV

Calculate buoyant force using Archimedes' principle F = ρVg. Enter fluid density and displaced volume for force in Newtons and displaced mass with interactive charts.

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Coefficient of Discharge Calculator — Cd = Q_act / (A × √(2gH))

Calculate the coefficient of discharge Cd for fluid flow through an orifice using actual discharge, diameter, and hydraulic head. Free online fluid dynamics calculator with flow resistance, theoretical discharge, and interactive comparison charts for engineers and physics students.

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Cv Flow Calculator — Valve Flow Coefficient Cv = Q × √(SG/ΔP)

Calculate valve flow coefficient Cv = Q × √(SG/ΔP) for liquid valve sizing. Free online fluid mechanics tool with pressure drop analysis and medium presets.

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Darcy-Weisbach Calculator — Pressure Drop & Head Loss ΔP = f·L·V²·ρ/(2·D)

Calculate pressure drop and head loss in pipes via the Darcy-Weisbach equation. Free fluid dynamics calculator with charts and breakdowns for engineers.

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Darcy's Law Calculator — Groundwater Flow Q = k×I×A

Calculate groundwater flow rate, hydraulic gradient, and permeability using Darcy's Law Q = k×I×A for porous media flow analysis in hydrogeology and fluid mechanics.

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Differential Pressure Calculator — ΔP = (Q²/Kv²) × S

Calculate differential pressure across a valve using ΔP=(Q²/Kv²)×S. Free fluid dynamics calculator with bar, Pa, psi results, breakdowns, and charts.

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Drag Equation Calculator — Aerodynamic Drag Force F_d = ½ρv²C_dA

Calculate aerodynamic drag force using F_d = 0.5 × ρ × v² × C_d × A. Enter velocity, cross-section area, and drag coefficient for instant physics results with charts and breakdowns.

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Fan CFM Calculator — Airflow & Power

Calculate fan CFM, pressure, and power output using the fluid power equation P = p × Q. Free fan airflow calculator with electrical efficiency analysis, unit conversions, and charts.

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Flow Rate Calculator

Calculate volumetric and mass flow rate for pipes and channels using Q = A x v. Free online flow rate calculator with shape selection, velocity input, and mass flow results.

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Friction Factor Calculator — Darcy Friction Factor

Calculate the Darcy friction factor for pipe flow using Moody approximation of the Colebrook equation. Free online Moody chart calculator with breakdowns for engineers and students.

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Friction Loss Calculator — Hazen-Williams Pipe Flow

Calculate pipe friction head loss and pressure drop using the Hazen-Williams equation. Enter pipe diameter, length, flow rate, and material to get accurate head loss in meters and pressure drop in kPa and bar.

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Froude Number Calculator — Open Channel Flow Fr = u/√(g·Hd)

Calculate the Froude number for open channel flow using Fr = u/√(g·Hd) with hydraulic depth from cross-section area and channel width. Classify flow as subcritical, critical, or supercritical with interactive charts.

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Hydraulic Conductivity Calculator — Soil Permeability

Calculate hydraulic conductivity of soil and porous media using Kozeny-Carman or Darcy's Law. Get K values in m/s and m/day with interactive charts and breakdown tables for groundwater flow analysis.

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Hydraulic Gradient

Calculate the hydraulic gradient (hₗ) between two measurement points using head difference and distance. Free online fluid mechanics calculator for groundwater flow direction, Darcy velocity, and potentiometric surface analysis in hydrogeology.

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Hydraulic Jump Calculator

Calculate hydraulic jump characteristics including Froude numbers, sequent depth, head loss, jump length, and jump efficiency for rectangular open channel flow. Free online fluid mechanics calculator.

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Hydraulic Radius Calculator

Calculate hydraulic radius for rectangular channels, trapezoidal channels, triangular channels, and circular pipes using R = A/P with interactive charts and breakdown.

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Hydrostatic Pressure Calculator

Calculate hydrostatic pressure at any depth using P = ρgh + P₀ with fluid presets for water, mercury, alcohol, and more. Free physics calculator with gauge and absolute pressure results, interactive charts, and formula breakdown.

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Isentropic Flow Calculator — Compressible Flow Properties

Calculate isentropic flow ratios, critical throat conditions, Mach angle, and mass flow from Mach number for compressible gas dynamics and aerodynamics.

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Kinematic Viscosity of Air Calculator — Sutherland Formula

Calculate kinematic viscosity of air from temperature and pressure using Sutherlands formula. Free fluid dynamics calculator with results in m²/s and cSt.

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Knudsen Number Calculator — Rarefied Gas Flow Regime

Calculate the Knudsen number (Kn = λ/L) for rarefied gas flows using mean free path and characteristic length. Free online fluid dynamics calculator with continuum, slip, transitional, or free molecular flow classification for physics and engineering.

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Lift Coefficient Calculator

Calculate the lift coefficient using CL = 2F / (ρAV²) or compute lift force from a known coefficient. Free online aerodynamics calculator with interactive charts and detailed breakdowns for aerospace engineers and physics students.

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Mach Number Calculator — Calculate Mach Speed Online

Calculate the Mach number of an object moving through air using its speed and air temperature. Free online compressible flow calculator with interactive speed comparison chart and flow regime classification.

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Magnus Force Calculator — Spinning Cylinder Fluid Dynamics

Calculate the Magnus force generated by a spinning cylinder in a fluid using the Kutta-Joukowski equation for fluid mechanics and aerodynamics applications.

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Manometer Calculator — Hydrostatic Fluid Pressure

Calculate hydrostatic pressure using the manometer equation P = ρgh. Free online fluid pressure calculator with interactive charts, unit conversions, and formula breakdown for physics students and engineers.

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NPSH Net Positive Suction Head Calculator — Pump Cavitation Check

Calculate NPSH available for pump cavitation analysis: surface pressure, vapor pressure, lift height, friction loss. Free online fluid dynamics calculator.

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Oblique Shock Calculator

Compute oblique shock wave properties from Mach and wave angle. Get turn angle, downstream Mach, and pressure, density, temperature, and stagnation ratios.

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Open Channel Flow Calculator — Manning's Equation

Calculate water flow velocity and volumetric discharge in open channels using Manning's equation. Free online open channel flow calculator with interactive charts and detailed hydraulic breakdowns for civil engineers and hydrology professionals.

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Orifice Flow Calculator — Flow Rate Through an Orifice

Calculate liquid discharge flow rate through an orifice using Q = Cd × A × √(2gH). Free online orifice flow calculator with charts and breakdown tables for fluid dynamics and hydraulics.

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Pipe Flow Calculator — Gravity-Fed Water Flow

Calculate water flow velocity and discharge in gravity-fed pipes using the Hazen-Williams equation. Free online pipe flow calculator with interactive charts and breakdown tables for engineers.

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Pipe Velocity Calculator — Fluid Flow Speed in Pipes

Calculate fluid velocity in pipes from flow rate and pipe diameter using v = 4Q/πd². Free online pipe velocity calculator with charts and breakdown tables for engineers and plumbers.

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Pneumatic Cylinder Force Calculator — Air Cylinder Force F = P × A

Calculate pneumatic cylinder force from pressure and bore diameter using F = P × A. Free online air cylinder force calculator supports single-acting and double-acting with friction loss.

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Poise-Stokes Converter — Dynamic to Kinematic Viscosity

Convert between poise (dynamic viscosity) and stokes (kinematic viscosity) using ν = η/ρ. Free online viscosity converter for physics and fluid mechanics with multi-unit outputs.

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Poiseuille's Law Calculator — Laminar Pipe Flow

Calculate volumetric flow rate and flow resistance for laminar pipe flow using Hagen-Poiseuille equation Q = π·ΔP·r⁴/(8·μ·L). Free online fluid dynamics calculator with interactive charts and fluid presets for water, blood, air, and more.

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Porosity and Permeability Calculator — Darcy's Law

Calculate permeability (k) and porosity (φ) of porous materials using Darcy's law and fluid flow equations. Free online physics calculator for earth sciences and hydrogeology.

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Pounds Per Minute Calculator — Mass Flow Rate

Calculate mass flow rate in pounds per minute (lb/min) from weight and time. Free online physics tool with instant results, unit conversions, and interactive charts.

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Prandtl Meyer Expansion Calculator

Calculate Prandtl-Meyer expansion wave properties: downstream Mach number, Mach angles, Prandtl-Meyer function, and isentropic flow property ratios for supersonic gas dynamics analysis.

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Prandtl Number Calculator

Calculate Prandtl number (Pr) for air, water or any fluid from viscosity, specific heat, and conductivity. Free fluid dynamics heat transfer calculator.

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Reynolds Number Calculator — Fluid Flow Regime Analysis

Calculate Re = ρvL/μ to determine if flow is laminar, transitional, or turbulent. Free calculator with fluid presets and interactive charts for engineers.

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Specific Gravity Calculator — Relative Density

Calculate specific gravity (relative density) of any material. Enter density or pick from common substances for SG value, buoyancy check, and comparison chart.

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Elastic Constants Calculator

Convert between elastic constants — Young's modulus, shear modulus, bulk modulus, Poisson's ratio, Lamé's constant, and P-wave modulus. Free online physics calculator.

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Acceleration Using Force And Mass Calculator — a = F/m

Calculate acceleration from force and mass using Newton second law a = F/m for physics mechanics engineering with instant results breakdowns and charts

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Angle Of Twist Calculator — Torsional Deformation ϕ = TL/JG

Calculate the angle of twist of a circular shaft under torque using the torsion formula ϕ = TL/JG. Free online mechanics calculator with instant radians and degrees results, breakdowns, and interactive charts for mechanical engineering.

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Angular Acceleration Calculator

Calculate angular acceleration of rotating objects using the formula α = (ω₂ − ω₁) / t. Free online physics calculator with instant rad/s² results, step-by-step breakdowns, and interactive charts for rotational motion problems.

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Angular Displacement Calculator — θ = s/r, ωt, ω₀t + ½αt²

Calculate angular displacement of rotating objects using θ = s/r, θ = ωt, or θ = ω₀t + ½αt². Free online physics calculator with instant radians and degrees results, step-by-step breakdowns, and interactive charts for rotational motion problems.

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Angular Momentum Calculator — L = Iω, L = mvr

Calculate angular momentum using L = I × ω for rigid bodies or L = m × v × r for point masses. Free online physics calculator with instant kg·m²/s results, step-by-step breakdowns, and interactive charts for rotational motion problems.

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Brake Mean Effective Pressure (BMEP) Calculator

Calculate brake mean effective pressure (BMEP) from engine torque and displacement. Free online BMEP calculator with charts for automotive engineering.

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Brinell Hardness Number Calculator — HBW from Indentation Test

Calculate Brinell hardness number (HBW) from applied load, ball diameter, and indentation diameter using the ISO 6506-1 standard formula with comparison charts.

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Column Buckling Calculator — Euler & Johnson Critical Load

Calculate the critical buckling load of a column using Euler formula for long columns and Johnson formula for short columns. Get slenderness ratio, column classification, and structural analysis charts for engineering design.

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Bulk Modulus Calculator — K = ΔP/(ΔV/V₀)

Calculate bulk modulus K = ΔP/(ΔV/V₀) from pressure and volume change. Free online physics calculator with interactive charts for engineers and science.

🚗

Car Crash Force Calculator — Impact Force & G-Force

Calculate crash impact force using F=mv²/2d. Compare seatbelt vs no-seatbelt forces, stopping time, and g-force. Free online physics crash safety calculator.

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Car Jump Distance Calculator — Projectile Motion Range & Landing Speed

Calculate car jump distance, maximum height, time of flight, and landing speed using projectile motion physics. Free online car jump distance calculator with trajectory charts and detailed breakdowns for stunt planning and physics education.

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Car Center of Mass Calculator — Longitudinal CG Position from Axle Weights

Calculate your car's center of mass (CG) position from front and rear axle weights and wheelbase. Get CG distance from each axle and weight distribution percentages with interactive charts for vehicle dynamics analysis.

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Carburetor CFM Calculator — Engine Airflow Requirement CFM = (CID × RPM × VE) / 3456

Calculate required carburetor CFM from engine CID, max RPM, and volumetric efficiency. Free automotive tuning calculator with interactive charts, detailed breakdowns, and worked examples.

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Cartesian Coordinates

Analyze any two points in a 2D Cartesian coordinate system — compute distance d = √((x₂−x₁)²+(y₂−y₁)²), midpoint, slope, line equation, and quadrant location with formula breakdowns and interactive charts.

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Centrifugal Force Calculator — F = mv²/r

Calculate centrifugal force using F = mv²/r for rotating objects. Enter mass, velocity, and radius to get force in newtons, centrifugal acceleration, and detailed physics breakdowns with interactive charts.

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Centrifuge Speed Calculator — RPM to RCF Converter

Convert between RPM and RCF for any centrifuge rotor using RCF = 11.18 × r × (RPM/1000)². Free online centrifuge speed calculator with instant RPM to g-force conversion, step-by-step breakdowns, and interactive charts for lab professionals and physics students.

🎯

Centripetal Force Calculator — F = mv²/r

Calculate centripetal force using F = mv²/r for objects in circular motion. Enter mass, velocity, and radius to get force in newtons, centripetal acceleration, and detailed physics breakdowns with interactive charts.

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Circular Motion Calculator — ω = 2π/T, a = v²/r

Calculate uniform circular motion parameters: angular velocity ω = 2π/T, frequency f = 1/T, tangential velocity v = ωr, centripetal acceleration a = v²/r, and centripetal force F = mv²/r. Free online physics calculator with interactive charts and detailed breakdowns for students and engineers.

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Conservation of Momentum Calculator — Elastic & Inelastic Collisions m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

Calculate final velocities of two colliding objects using the law of conservation of momentum m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂ for elastic and perfectly inelastic collisions with kinetic energy analysis, breakdowns, and interactive charts. Ideal for physics students and educators.

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Copper Wire Weight Calculator — Weight in kg, g, lb & oz

Calculate copper wire weight for round, square, rectangular, and hexagonal wires. Supports pure copper and 12 common alloys with instant kg, g, lb, and oz results, charts, and detailed material breakdowns.

🌍

Coriolis Effect Calculator — F = 2mvΩ sin(φ)

Calculate the Coriolis force and acceleration on a moving object using F = 2mvΩ sin(φ) with mass, velocity, latitude, and hemisphere. Free online physics calculator with interactive charts and breakdowns for students, pilots, and meteorologists.

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Crawl Ratio Calculator — 4x4 Off-Road Gearing

Calculate your 4x4 crawl ratio from transmission, transfer case, and axle gear ratios. Free off-road calculator with interactive charts and capability assessment.

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Delta V Calculator — Change in Velocity Δv = a×t, v₂−v₁

Calculate change in velocity (delta-v) from acceleration and time using Δv = a × t or from initial and final velocities Δv = v_final − v_initial. Free online physics calculator with interactive charts and step-by-step breakdowns for students and engineers.

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Density of a Cylinder Calculator — ρ = m/(πr²h)

Calculate cylinder density from mass, radius, and height using ρ = m/(πr²h). Free online physics calculator with volume, breakdowns, and interactive charts.

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Density to Mass Calculator — m = ρ × V

Calculate the mass of an object from its density and volume using the physics formula m = ρ × V. Free online density to mass calculator with interactive charts and step-by-step breakdowns for students, engineers, and scientists.

⚖️

Density to Weight Calculator — W = ρ × V

Calculate the weight (mass) of any object from its density and volume using W = ρ × V. Free online density to weight calculator with 35+ material presets, unit conversion, interactive charts, and detailed breakdowns for physics and engineering.

🎢

Displacement Calculator — s = v₀t + ½at² Kinematic Formula

Calculate linear displacement using three kinematic formulas: s = v×t, s = v₀t + ½at², or s = (v² − v₀²)/(2a). Free online physics calculator with instant results, step-by-step breakdowns, and interactive charts for kinematics problems.

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Elastic Potential Energy Calculator

Calculate elastic potential energy using EPE = ½k·x². Enter spring constant and displacement to get energy, spring force, and max velocity with charts.

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Engine Displacement Calculator

Calculate engine displacement in cc and cubic inches from bore, stroke, and cylinders. Free engine size calculator using the formula V = N × π/4 × D² × L for automotive engines.

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Exhaust Diameter Calculator — Optimal Exhaust Pipe Size

Calculate optimal exhaust pipe inner diameter from peak torque RPM, engine displacement, and cylinder count. Free online automotive exhaust size calculator with charts and breakdowns.

🏗️

Factor Of Safety Calculator — FoS = Max Strength / Design Load

Calculate the factor of safety (safety factor) of a structure using FoS = maximum strength / design load. Free online engineering calculator for structural and mechanical design with interactive charts.

🎯

Foot Pounds Of Energy Calculator

Calculate projectile energy in foot-pounds (ft-lbs) from mass in grains and velocity in ft/s. Free bullet energy calculator with joule conversion and interactive charts for ballistics.

📉

Free Fall Calculator

Calculate free fall time, final velocity, and impact speed from height using t = sqrt(2h/g) and v = sqrt(2gh) with Earth gravitational acceleration g = 9.80665 m/s². Free online physics calculator for students and engineers.

📉

Free Fall Distance Calculator — d = v₀t + ½gt²

Calculate free fall distance from time or velocity using d = v₀t + ½gt². Get distance fallen, final velocity, and interactive distance vs time charts for physics students.

⏱️

Free Fall Time Calculator — t = √(2h/g)

Calculate free fall time from height or velocity using t = √(2h/g). Enter height, gravity, and initial velocity to get the exact fall time, final velocity, and interactive charts. Free online physics calculator for students and engineers.

🧲

Friction Calculator — F = μN

Calculate friction force using F = μN. Enter coefficient of friction and normal force, or any two values to solve for the third. Free online physics calculator with charts and step-by-step breakdown.

⚖️

Friction Coefficient Calculator — μ = F / N

Calculate the coefficient of friction (μ) from friction force and normal force using μ = F / N. Free online physics calculator with interactive charts and step-by-step breakdown for students and engineers.

🧲

Friction Force Calculator — F = μ × N

Calculate friction force using F = μ × N. Enter coefficient of friction and normal force to get friction force in newtons with interactive charts and step-by-step breakdown.

📍

Fulcrum Calculator

Find the ideal fulcrum position for Class I, II, or III levers. Enter load, effort, and lever length to calculate mechanical advantage, load arm, and effort arm distances.

🏎️

G-Force Calculator

Calculate g-force from velocity change and time using g = Δv / (t × 9.80665). Free online physics calculator with interactive charts for students, engineers, and motorsports enthusiasts.

⚙️

Gear Ratio Calculator

Calculate gear ratio and output RPM from driven and drive gear teeth counts. Free online mechanical engineering calculator with instant results, breakdown table, and interactive charts for gear train analysis.

⚙️

Gear Ratio RPM Calculator — Output Speed from Gear Teeth

Calculate output RPM from input gear teeth, output gear teeth, and input speed. Free online gear ratio RPM calculator with interactive charts and breakdowns for mechanics, engineers, and hobbyists.

⚙️

Gear Ratio Speed Calculator — Output RPM from Gear Teeth

Calculate gear ratio and output speed from input and output gear teeth. Enter your gear teeth count and input RPM to find the gear ratio, speed ratio, and output rotational speed with interactive charts and breakdowns.

🪐

Gravitational Force Calculator

Calculate the gravitational force between two masses using Newton's law of universal gravitation F = G·m₁·m₂/r². Enter masses in kg and distance in meters to get force in newtons with breakdown and interactive charts.

🎯

Horizontal Projectile Motion Calculator

Calculate horizontal projectile motion using initial velocity and height. Get time of flight, range, final velocity, and impact angle with interactive charts.

⚖️

Immersed Weight

Calculate the apparent weight (immersed weight) of an object submerged in any fluid using Archimedes' principle. Free online physics buoyancy calculator with charts.

💥

Impact Energy

Calculate kinetic impact energy of a moving object using E = ½mv². Free online physics calculator with interactive charts, breakdown table, and accurate results in joules for engineers and students.

💥

Impulse And Momentum Calculator

Calculate impulse and momentum using J = Δp = m·Δv. Free physics calculator for initial momentum, final momentum, change in momentum, and impulse with charts.

📐

Inclined Plane Calculator

Calculate acceleration, final velocity, sliding time, and energy loss for objects on an inclined plane with friction. Supports sliding blocks and rolling bodies (balls, cylinders, hoops) with interactive physics charts and formulas.

⚖️

Lever Calculator — Mechanical Advantage

Calculate lever mechanical advantage, effort force, load force, and lever arm lengths using the law of the lever Fa × a = Fb × b. Free online physics calculator with interactive charts and detailed breakdowns for students and engineers.

🚀

Magnitude Of Acceleration Calculator

Calculate the magnitude of acceleration using velocity change over time with the formula a = Δv/Δt. Free online kinematics calculator with interactive charts, formula breakdown, and instant results for physics students and engineers.

📈

Maximum Height Projectile Motion Calculator

Calculate the maximum vertical height reached by a projectile using initial velocity, launch angle and initial height. Free online physics calculator with interactive charts for students and engineers.

⚙️

Mechanical Advantage Calculator

Calculate mechanical advantage for levers, pulleys, screws, wedges, ramps, and wheel and axle machines. Free physics tool with charts and force conversions.

🎯

Minute of Angle (MOA) Calculator

Calculate Minute of Angle (MOA) for shooting and optics. Enter distance, spread, or MOA to find the missing value using the exact angular measurement formula with interactive charts and MIL conversion.

⭕

Mohr's Circle

Compute σ₁, σ₂, max shear, von Mises, and orientation angle via Mohr's circle. Free stress analysis tool for mechanics and civil engineering applications.

📐

Newton's Second Law Calculator — F = ma

Calculate net force, acceleration, and mass using Newton's Second Law of Motion: F = ma. Enter mass, initial velocity, final velocity, and time for instant physics results with interactive charts and detailed breakdowns.

↔️

Newton's Third Law Calculator — Action-Reaction Forces

Calculate action and reaction force pairs using Newton's Third Law of Motion: F₁₂ = -F₂₁. Enter mass and acceleration values to find the equal and opposite reaction force instantly with charts and breakdowns.

↗️

Normal Force Calculator

Calculate the normal force exerted by a surface on an object using mass, incline angle, and external force. Free online physics calculator with interactive charts and detailed breakdowns.

⏱️

Pendulum Frequency Calculator — Simple Pendulum Oscillation Frequency

Calculate pendulum frequency using f = 1/(2π)√(g/L). Enter length and gravity to get hertz, period, angular frequency, and oscillations per minute with interactive charts.

🕰️

Pendulum Period Calculator — Simple Pendulum Oscillation Period

Calculate pendulum period and frequency using T = 2π√(L/g). Enter length and gravity to get oscillation period, frequency, and angular frequency with interactive charts.

⏱️

Physical Pendulum Calculator — Period, Frequency & Oscillations

Calculate the period and frequency of a physical pendulum using its moment of inertia, mass, and pivot distance. Free physics pendulum calculator with interactive charts.

🔩

Piston Speed Calculator

Calculate mean piston speed from stroke length and RPM using the formula v = 2 x L x N / 60. Free online engine piston speed calculator with multi-unit outputs and interactive charts.

🔬

Poisson's Ratio Calculator

Calculate Poisson's ratio (ν) from strain or Young's and shear modulus. Free physics calculator with material classification, bulk modulus, and charts.

🏎️

Power To Weight Ratio Calculator

Calculate the power-to-weight ratio (PWR) of any vehicle. Enter horsepower or kW and weight in lbs or kg. Get results in hp/lb, hp/ton, kW/kg, and W/kg.

🔧

Principal Stress Calculator — Maximum and Minimum Principal Stresses

Calculate maximum and minimum principal stresses from normal stress σx and σy, and shear stress τxy using the principal stress formula. Free online mechanics calculator for engineering stress analysis with interactive charts.

🎯

Projectile Motion Calculator

Calculate projectile motion parameters including time of flight, range, maximum height, and velocity components from initial velocity, launch angle, and height. Free online physics calculator with interactive breakdown charts and formulas.

🎯

Projectile Motion Experiment Calculator

Analyze projectile motion experiments by calculating velocity components, time of flight, range, maximum height, impact velocity, and impact angle. Free online physics calculator with interactive trajectory charts.

💧

Pump Horsepower Calculator

Calculate pump shaft power, hydraulic power, and specific speed from flow rate, head, fluid density, and efficiency. Free online pump horsepower calculator with interactive charts and breakdowns for engineers and fluid mechanics applications.

🎯

Range Projectile Motion Calculator

Calculate the horizontal range, time of flight, and maximum height of a projectile using initial velocity, launch angle, and initial height. Free online physics calculator with interactive charts and formula breakdown for students and engineers.

🔫

Recoil Energy Calculator

Calculate firearm recoil energy, recoil impulse, and firearm velocity using conservation of momentum. Free online physics calculator with interactive charts and detailed formula breakdowns for shooters, hunters, and physics students.

⚖️

Reduced Mass Calculator

Calculate the reduced mass of any two-body system using μ = m₁ × m₂ / (m₁ + m₂). Free online physics calculator with charts and breakdown for mechanics, astrophysics, and molecular physics.

🛞

Rolling Resistance Calculator — Force, Power, and Coefficient

Calculate rolling resistance force and power using F_rr = C_rr × m × g. Free online physics calculator with 12 surface presets, interactive charts, and detailed breakdowns for automotive, cycling, and engineering applications worldwide.

🔄

Rotational Kinetic Energy Calculator — KE = ½Iω²

Calculate rotational kinetic energy from moment of inertia and angular velocity using KE = ½Iω². Free online physics calculator with interactive charts and step-by-step breakdowns for students, engineers, and hobbyists.

📐

Section Modulus Calculator

Calculate the elastic section modulus S and plastic section modulus Z of common beam cross-sections including rectangles, circles, I-beams, and hollow sections. Free online structural engineering calculator with interactive charts and step-by-step breakdowns.

⚙️

Shaft Size Calculator — Minimum Diameter for Torsion and Combined Loads

Calculate the minimum shaft diameter required to safely transmit torque or withstand combined bending and torsional loads. Free online mechanical engineering calculator for solid and hollow circular shafts with interactive charts and step-by-step breakdowns.

🛷

Sled Ride Calculator

Calculate sled ride speed, acceleration, stopping distance, and safety using physics inclined plane formulas. Free online sled ride calculator for winter safety.

🔄

Mass Moment of Inertia Calculator

Calculate mass moment of inertia (rotational inertia) for solid sphere, hollow sphere, cylinder, rod, rectangular plate, and point mass using standard physics formulas. Free online rotational dynamics calculator with charts.

🔄

Polar Moment of Inertia Calculator

Calculate polar moment J = πD⁴/32 for solid and J = π(D⁴-d⁴)/32 for hollow circular sections. Free engineering calculator with charts and multi-unit outputs.

🧻

Toilet Paper Race — Mass Moment of Inertia

Calculate the mass moment of inertia of a toilet paper roll (hollow cylinder) using I = ½m(r₁²+r₂²) and simulate the classic toilet paper race down an incline. Free online physics calculator with charts.

⚛️

Compton Scattering Calculator — Δλ = h/(mc)(1−cosθ)

Calculate Compton scattering wavelength shift Δλ = h/(mc)(1−cosθ) for any particle mass and scattering angle. Free online quantum mechanics calculator with photon energy loss, scattered wavelength, and interactive angle-vs-shift charts for physics students and researchers.

⚛️

Compton Wavelength Calculator — λ = h/(mc) for Electrons, Protons, Neutrons

Calculate the Compton wavelength of any particle using λ = h/(mc). Enter mass in kg or select presets for electron, proton, neutron, muon, and tau particles. Free online quantum mechanics calculator with results in m, pm, fm, and eV.

⚛️

De Broglie Wavelength Calculator — λ = h/(mv)

Calculate the de Broglie wavelength λ = h/(mv) of any particle — electron, proton, neutron, or custom. Free online quantum mechanics calculator with wavelength in m/nm/pm, momentum, interactive charts, and step-by-step breakdowns for physics students and researchers.

✨

Energy To Wavelength Calculator — Convert Photon Energy to Wavelength

Convert photon energy in eV to wavelength in nanometers using Planck's equation λ = hc/E. Free online physics calculator with frequency, wavenumber, and interactive charts for quantum mechanics and spectroscopy.

⚛️

Fermi Level Calculator — Fermi Energy, Wave Vector & Temperature

Calculate Fermi energy, Fermi wave vector, Fermi temperature, Fermi velocity, and the Fermi-Dirac distribution from electron number density with this free online solid-state physics calculator for students, researchers, and engineers.

⚛️

Heisenberg Uncertainty Principle Calculator

Calculate minimum position, momentum, and velocity uncertainties using Heisenberg's principle Δx·Δp ≥ h/4π. Free online quantum mechanics calculator with charts.

⚛️

Hydrogen Like Atom Energy Levels Calculator

Calculate hydrogen-like atom energy levels, ionization energy, Bohr radius, orbital velocity, and spectral transition wavelengths using the Bohr model formula En = -13.6 Z² / n² eV for physics students and researchers.

🧲

Magnetic Moment Calculator — Atomic Magnetic Moment

Calculate atomic magnetic moment from quantum numbers S, L, J using the Landé g-factor formula. Free online quantum mechanics calculator with charts and breakdown for physics students and researchers.

⚛️

Photoelectric Effect Calculator — Einstein's KEmax = hf − φ

Calculate photoelectric effect parameters using Einstein's photoelectric equation KEmax = hf − φ. Get photon energy, max kinetic energy, stopping potential, threshold frequency, and threshold wavelength with interactive charts and detailed step-by-step breakdowns for students and educators.

☀️

Photon Energy

Calculate photon energy from wavelength using E = hc/λ. Free online calculator with results in joules, eV, and frequency, plus interactive charts for quantum mechanics.

🐛

Bug Rivet Paradox Calculator — Special Relativity Thought Experiment

Calculate the bug-rivet paradox in special relativity. Find Lorentz factor γ, apparent rivet length, critical speed thresholds βc1 and βc2, and the bug's fate.

🌡️

Altitude Temperature Calculator — Temperature at Any Altitude

Calculate temperature at any altitude using the International Standard Atmosphere (ISA) model. Free online altitude temperature calculator with results in Celsius, Fahrenheit, and Kelvin for aviation, mountaineering, and physics.

🌡️

Biot Number Calculator – Heat Transfer Analysis

Calculate Biot number for transient heat conduction to see if the lumped capacitance model applies. Free heat transfer calculator with charts and breakdowns.

⬛

Blackbody Radiation Calculator – Planck Spectrum & Wien's Law

Calculate blackbody radiation properties including peak wavelength from Wien's law, spectral radiance from Planck's law, and total radiated power from the Stefan-Boltzmann law with interactive charts.

🌡️

Calorimetry Calculator — Q = mcΔT Heat Transfer

Calculate heat energy transfer using Q=mcΔT with material presets for water, metals, and gases. Free physics calculator with results in J, kJ, cal, and kcal.

♨️

Carnot Efficiency Calculator — Maximum Theoretical Heat Engine Efficiency η = 1 − T_c/T_h

Calculate Carnot (reversible) heat engine efficiency η=(T_h−T_c)/T_h. Enter hot & cold °C for efficiency %, decimal value, and Kelvin conversions with charts.

🔥

Charles's Law Calculator — V₁/T₁ = V₂/T₂ Isobaric Gas Law

Calculate any unknown variable in Charles's Law V₁/T₁ = V₂/T₂ for ideal gases in isobaric processes. Free online calculator with Kelvin conversion, instant results, and volume-temperature charts for physics, chemistry, and thermodynamics students.

🔬

Compressibility Factor Calculator — Z = PV/nRT

Calculate the compressibility factor Z of any real gas using Z = PV/nRT. Free online thermodynamics calculator with gas deviation analysis, PV vs nRT comparison charts, and detailed breakdowns for engineers and physics students.

✈️

Density Altitude Calculator

Calculate aviation density altitude from temperature, dewpoint, altimeter setting, and elevation. Get results in feet and km with the ICAO standard atmosphere for flight planning.

♨️

Effectiveness-NTU Calculator — Heat Exchanger Thermal Analysis

Calculate heat exchanger effectiveness, NTU, and outlet temperatures using the ε-NTU method for parallel flow, counter flow, cross flow, and phase-change configurations. Free online thermal engineering tool with charts.

♻️

Efficiency Calculator — Energy Efficiency η = Eout/Ein × 100%

Calculate energy efficiency as the ratio of useful energy output to total energy input with our free online physics calculator. Supports J, kJ, cal, kcal, Wh, kWh, and BTU units with unit conversion, interactive bar and pie charts, and step-by-step breakdowns.

🔥

Enthalpy Calculator — Reaction Heat Change

Calculate standard enthalpy change ΔH° of reactions. Enter coefficients and ΔHf° for reactants and products to determine exothermic or endothermic type.

💧

Evaporation Rate Calculator — Water Evaporation

Calculate water evaporation rate from surface area, air speed, temperature, and relative humidity using the Dalton-type evaporation formula for pools, ponds, and open water bodies.

🌡️

Gay-Lussac's Law Calculator — P₁/T₁ = P₂/T₂

Calculate final gas pressure using Gay-Lussac's Law P₁/T₁ = P₂/T₂ for isochoric processes. Free online thermodynamics pressure law calculator with interactive charts, breakdowns, and step-by-step analysis for physics and chemistry students and engineers.

♨️

Heat Capacity Calculator — S = mc & Q = mcΔT

Calculate heat capacity (S = mc) and heat energy (Q = mcΔT) using mass and specific heat. Free online physics calculator with 30+ material presets and interactive charts.

🔥

Heat Transfer Calculator — Conduction, Convection & Radiation

Calculate heat transfer using Q=mcΔT, Fourier conduction, Newton convection, and Stefan-Boltzmann radiation. Free online physics calculator with material presets and charts.

🌡️

Heat Transfer Coefficient

Calculate overall heat transfer coefficient (U-value) and thermal resistance for multi-layer walls with up to 10 layers. Free online heat transfer calculator with conduction and convection modes, material presets from thermal conductivity database, and interactive charts.

🧪

Ideal Gas Density Calculator

Calculate gas density using ρ = PM/RT from pressure, temperature, and molar mass. Free online physics tool with 16 gas presets (air, CO₂, He, H₂, O₂) and interactive charts for thermodynamics and engineering.

📜

Ideal Gas Law Calculator — PV = nRT

Calculate any variable in the ideal gas law PV = nRT with this free online calculator. Solve for pressure, volume, moles, or temperature from three known values with interactive charts and breakdown.

🎈

Ideal Gas Pressure Calculator

Calculate ideal gas pressure using PV = nRT. Free online thermodynamics calculator with Pa, kPa, bar, and atm results, interactive charts, and breakdown for physics and engineering students.

🌡️

Ideal Gas Temperature Calculator

Calculate ideal gas temperature using the ideal gas law PV = nRT. Free online thermodynamics calculator with Kelvin and Celsius results, interactive charts, and breakdown for physics and engineering students.

💨

Ideal Gas Volume Calculator

Calculate ideal gas volume via V = nRT/P. Free online thermodynamics calculator with m³ and liter results, interactive charts, and breakdown for physics and engineering students.

🧊

Latent Heat

Calculate latent heat energy absorbed or released during phase transitions like melting, freezing, boiling, and condensation using Q = mL. Free online thermodynamics calculator with substance presets and interactive charts.

🌡️

LMTD Calculator — Log Mean Temperature Difference for Heat Exchangers

Calculate the log mean temperature difference for counter flow and parallel flow heat exchangers using LMTD = (ΔT₁ − ΔT₂) / ln(ΔT₁ / ΔT₂). Free online thermodynamics tool with interactive temperature profile charts and detailed breakdowns for engineers and students.

♻️

Mixed Air Calculator — HVAC Air Stream Mixing Temperature

Calculate the mixed air temperature and total flow when combining two air streams in HVAC systems using the weighted average formula. Free online thermodynamics calculator with interactive charts.

🌡️

Mixed Air Temperature Calculator — Weighted Average of Gas Streams

Calculate mixed air temperature from two gas streams via weighted average formula. Free online thermodynamics calculator with interactive charts for HVAC.

🌡️

Newton's Law of Cooling Calculator — T(t) = T_amb + (T₀ − T_amb)e⁻ᵏᵗ

Calculate the final temperature of an object cooling over time using Newton's Law of Cooling formula T(t) = T_amb + (T₀ − T_amb) × e⁻ᵏᵗ. Free online thermodynamics tool with interactive cooling curve for students and engineers.

🌡️

Nusselt Number Calculator — Convective Heat Transfer

Calculate the Nusselt number (Nu) for convective heat transfer using characteristic length, convection coefficient, and fluid thermal conductivity. Free online heat transfer calculator with interactive charts and detailed breakdowns for engineering students and professionals.

🔥

Coefficient of Performance (COP) Calculator — Heat Pump & Refrigerator Efficiency

Calculate the coefficient of performance for heat pumps, refrigerators, and air conditioners using basic COP = Q/W or Carnot theoretical maximum with interactive charts.

💨

Psychrometric Calculator — Moist Air Properties

Calculate moist air psychrometric properties from dry bulb temperature, relative humidity, and altitude. Get saturation vapor pressure, humidity ratio, dew point temperature, enthalpy, and specific volume using ASHRAE standard formulas with interactive charts.

🧊

Refrigerant Capillary Tube Resizer Calculator

Resize a refrigerant capillary tube for HVAC systems using the formula NL = OL × (New ID / Orig ID)⁴·⁶. Enter any three dimensions to compute the fourth with interactive comparison charts.

🌡️

Sensible Heat

Calculate sensible heat energy using Q = mcΔT for any material. Free online thermodynamics calculator with material presets, interactive charts, and step-by-step breakdowns.

🌡️

Specific Gas Constant Calculator — Rs = R/M

Calculate the specific gas constant Rs = R / M for any gas using molar mass. Free online thermodynamics calculator with gas presets for air, CO2, He, H2, O2, and more with comparison charts.

🌡️

Specific Heat Capacity Calculator

Calculate heat energy transfer using Q = mcΔT with mass, specific heat capacity, and temperature change. Free online thermodynamics calculator with charts.

🌀

Angular Frequency Calculator — ω = 2πf, ω = 2π/T, ω = Δθ/Δt

Calculate angular frequency using ω = 2πf, ω = 2π/T, or ω = Δθ/Δt. Free physics calculator with instant rad/s results, breakdowns, and interactive charts.

🔄

Critical Damping Calculator — c_c = 2√(km)

Calculate the critical damping coefficient and natural frequency of a damped harmonic oscillator. Enter any two of mass, stiffness, natural frequency, or damping coefficient to compute the remaining parameters with charts and breakdowns.

🔄

Damping Ratio Calculator — ζ = c/(2√(mk)) for Damped Harmonic Oscillators

Calculate the damping ratio ζ = c/(2√(mk)) of a damped harmonic oscillator from mass, stiffness, and damping coefficient. Free online physics calculator with system classification, natural frequency, damped frequency, and interactive charts for mechanical vibrations and oscillations.

📳

Natural Frequency Calculator — Spring-Mass & Pendulum

Calculate natural frequency of spring-mass systems and pendulums. Get frequency (Hz), angular frequency (rad/s), and period (s) with interactive charts and detailed breakdown tables for engineering and physics.

🔊

Acoustic Impedance

Calculate acoustic impedance Z = ρc from density and speed of sound with reflection and transmission coefficients for ultrasound imaging, NDT, and acoustics

💡

Angle Of Incidence Calculator

Calculate the angle of incidence for a light ray using Snell law of refraction. Free online optics calculator with instant results, step-by-step breakdowns, and comparison charts for physics students.

🔦

Angle of Refraction Calculator — Snell's Law n₁ sin θ₁ = n₂ sin θ₂

Calculate refraction angle using Snell's law n₁ sin θ₁ = n₂ sin θ₂. Includes refractive index presets for air, water, glass, and diamond. Free physics calculator.

🔭

Angular Resolution Calculator — Rayleigh Criterion θ = 1.22 × λ / D

Calculate the angular resolution of any optical system using the Rayleigh criterion θ = 1.22 × λ / D. Free online physics calculator with instant radians, degrees, and arcseconds results, step-by-step breakdowns, and comparison charts for telescopes, microscopes, and camera lenses.

〰️

Beat Frequency Calculator – Wave Interference

Calculate beat frequency from two sound waves using f_beat = |f₁ − f₂|. Wave interference calculator for acoustics, music tuning, and signal processing.

💎

Bragg's Law Calculator — X-ray Diffraction Angle

Calculate X-ray diffraction angles using Bragg's Law nλ = 2d sin θ. Free online calculator for X-ray crystallography, XRD analysis, and structural biology with charts.

🕶️

Brewster's Angle Calculator — Polarized Light Angle

Calculate Brewster's angle of polarization from refractive indices of two optical media. Free online physics calculator for polarized light, reflection reduction, and optics applications with charts.

🌸

Camera Lens Blur Calculator — Background Bokeh Estimator

Calculate background blur circle diameter for any camera lens and sensor. Get blur disk size, percentage of sensor width, and aperture diameter with charts.

👁️

Contact Lens Vertex Calculator — Fc = Fo/(1−d×Fo)

Convert spectacle power to contact lens power using the vertex compensation formula Fc = Fo/(1−d×Fo). Free online calculator for spherical and toric lenses with interactive charts and detailed breakdowns.

🔊

Speaker Crossover Calculator — Passive Audio Crossover Design

Design passive speaker crossovers for 2-way and 3-way audio systems. Calculate capacitor and inductor values for Butterworth filters with frequency response charts for DIY speaker builders.

🔊

dB Calculator — Sound Pressure & Intensity Level

Calculate sound pressure level (SPL) from pressure in pascals and sound intensity level (SIL) from intensity in W/m² using standard decibel formulas. Free online physics dB calculator with distance attenuation and interactive charts.

📶

dB Gain Calculator — Amplifier & Signal Gain in Decibels

Calculate amplifier gain in dB from power (10·log₁₀) or voltage (20·log₁₀) ratios. Free dB gain calculator for audio, RF, and electronics with charts.

🔬

Diffraction Calculator – Single & Double Slit Wave Optics

Calculate single slit and double slit diffraction patterns using wave optics formulas. Compute fringe positions, angular deflection, and central maximum width for physics lab analysis.

📢

Distance Attenuation

Calculate how sound pressure level (SPL) decreases with distance using the inverse square law SPL₂ = SPL₁ − 20·log₁₀(R₂/R₁). Free online acoustics calculator for audio engineers, noise consultants, and physics students.

🌊

Doppler Effect Calculator

Calculate observed frequency using the Doppler effect formula f' = f₀(v+vᵣ)/(v+vₛ) with relative motion. Free online Doppler shift calculator for physics with motion parameters, charts, and breakdowns.

📶

Frequency Calculator — f = c/λ

Calculate the frequency of any waveform from wavelength using f = c/λ. Supports electromagnetic waves, sound waves, and wave velocity presets. Free online physics calculator for students and engineers.

〰️

Frequency Converter

Convert between 12 frequency units including Hz, kHz, MHz, GHz, THz, RPM, rad/s, and deg/s instantly. Free online frequency unit converter for physics, engineering, and radio applications.

〰️

Frequency To Wavelength

Convert frequency to wavelength using the wave equation λ = v / f. Solve wave problems across mechanics, electromagnetism, and acoustics with instant results and charts.

📡

Fresnel Zone Calculator

Calculate the first Fresnel zone radius, max radius, and clearance distances for wireless links from frequency and antenna separation. Free RF engineering tool.

💇

Hair Diffraction Calculator

Measure human hair thickness via laser diffraction. Enter wavelength, wall distance, and dark spot position to calculate hair width in micrometers with charts.

🌊

Harmonic Wave Equation Calculator — Wavelength from v=fλ

Calculate wavelength from velocity and frequency using v = fλ. Free online wave equation calculator with interactive charts for sound, light, and EM waves.

🔊

Helmholtz Resonator Calculator — Resonance Frequency & Acoustic Analysis

Calculate the Helmholtz resonance frequency of a cavity based on volume, opening area, and neck length using the formula f = (c/2π) √(A₀/(V·L₀)). Free online physics calculator with interactive charts and breakdowns for acoustics engineering, musical instrument design, and physics education.

💎

Index Of Refraction

Calculate the refractive index n = c/v of any optical medium. Compare vacuum, air, water, glass, diamond and more with this free online physics calculator featuring interactive charts.

🔦

Laser Beam Divergence Calculator

Calculate the divergence angle of a laser beam using initial diameter, final diameter, and distance. Free online optics calculator with interactive beam expansion charts for physicists, engineers, and laser professionals.

🔦

Laser Beam Expander Calculator

Calculate laser beam expander magnification, output beam diameter, output divergence, and beam diameter at any distance using MP = fO / |fI|. Free online optics calculator for physics students, engineers, and laser professionals.

💡

Laser Brightness Calculator

Calculate laser radiance (brightness) from power and wavelength using the formula L = P/λ². Free online optics calculator for physics students and engineers comparing laser sources by radiance.

🎇

Laser Linewidth and Bandwidth Calculator

Calculate laser spectral linewidth using the Schawlow-Townes formula Δν = πhνΓ²/P. Enter wavelength, cavity linewidth, and power to get accurate linewidth results in Hz with charts.

🎯

Laser Spot Size Calculator

Calculate the focused spot size of a laser beam using wavelength, beam diameter, focal length, and beam quality factor M². Free online optics calculator with interactive charts and formula breakdowns for physics, engineering, and laser applications.

🔬

Lensmaker's Equation Calculator — Focal Length & Lens Power

Calculate focal length and lens power using the lensmaker's equation 1/f = (n−1)(1/R₁ − 1/R₂). Free online optics calculator with thin and thick lens formulas, step-by-step breakdown, and interactive charts for physics students and engineers.

⚡

Lightning Distance Calculator

Calculate lightning distance via flash-to-bang method. Free storm distance calculator uses speed of sound formula for accurate results in km, miles, and feet.

💡

Malus's Law Calculator — Light Polarization & Intensity

Calculate transmitted light intensity through a polarizer using Malus's Law I = I₀ cos²θ. Free online optics and polarization calculator with interactive charts and formula breakdown for physics students and researchers.

🪞

Mirror Equation Calculator — Optics Distance, Focal Length & Magnification

Solve the mirror equation 1/f = 1/v + 1/u to compute object distance, image distance, focal length, radius of curvature, and magnification of concave, convex, and plane mirrors. Free online physics optics calculator with interactive charts.

📡

Modulation Calculator — AM, FM, PM Modulation Index

Calculate modulation index for AM (Am/Ac), FM (Δf/fm), and PM (Δθ) signals. Free online telecommunications calculator with interactive charts, classifications, and breakdowns for engineers and physics students.

📡

Radar Horizon Calculator

Calculate the maximum detection range of a radar based on antenna and target heights, Earth curvature, and atmospheric refraction. Free physics calculator with charts.

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Reverberation Time Calculator — Room Acoustics RT60

Calculate the reverberation time (RT60) of any room using Sabine formula. Enter room dimensions, doors, and windows to get the effective absorbing area and optimal RT60 for speech or music. Free online acoustic calculator with absorption breakdown charts for architects, sound engineers, and interior designers.

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Diopter Calculator — Optical Power & Focal Length Converter

Convert focal length to optical power in diopters using the formula P = 1/f. Free online diopter calculator for eyeglass prescriptions, lens design, and optics education.