Biology Calculators
Biology, genetics, plants, animals, and life science calculators for students and professionals
Animal Pregnancy
2 calculatorsSheep Gestation Calculator
Calculate your sheep's lambing due date from the mating date using the average 147-day gestation period. Free sheep pregnancy calculator with lambing date range, timeline, and progress charts for breeders and farmers.
Swine Gestation Calculator
Calculate your pig farrowing due date from the breeding date using the average 114-day gestation period. Free swine pregnancy calculator with farrowing date range, timeline, and progress charts for farmers and breeders.
Biology Calculators
101 calculatorsAcres Per Hour
Calculate effective field coverage rate in acres per hour based on implement width, speed, and field efficiency for agricultural machinery planning and crop management
Allele Frequency
Allele frequency calculator using the Hardy-Weinberg equation. Compute carrier probability and genotype frequencies from disease prevalence for recessive traits.
Animal Mortality Rate
Calculate livestock mortality rate, cumulative mortality, and case fatality for poultry, cattle, pigs, and other farm animals. Free online death rate calculator with charts and breakdowns.
Annealing Temperature Calculator (PCR)
Calculate optimal PCR annealing temperature using primer and target DNA melting temperatures with the Rychlik formula. Free online molecular biology tool for PCR primer design and thermal cycling optimization.
Bacteria Growth Calculator
Calculate bacterial population growth over time using the exponential growth formula. Free biology calculator with final population, doubling time, and growth charts.
Benadryl Dosage For Dogs
Calculate safe Benadryl (diphenhydramine) dosage for dogs by weight. Get recommended single dose in mg, mL for liquid, and tablet count for allergies, anxiety, and motion sickness.
Bird Age Calculator
Convert your pet bird age to human-equivalent years based on species average lifespan. Supports parakeets, cockatiels, lovebirds, finches, canaries, African greys, and conures with conversion charts.
Bulb Spacing Calculator
Calculate how many flower bulbs fit your garden. Supports rectangular and triangular grids with presets for tulips, daffodils, crocus, hyacinths, and more.
Cat Age Calculator
Convert your cat age to human-equivalent years using the veterinary-approved formula. Free online cat age converter with life stage classification and chart.
Cat Benadryl Dosage
Calculate safe Benadryl (diphenhydramine) dosage for cats by weight. Get the single dose in mg, mL for liquid, or tablet count for allergies and motion sickness.
Cat BMI Calculator
Calculate your cat's FBMI using rib cage and leg length. Assess if your cat is underweight, normal, overweight, or obese using the vet-approved FBMI formula.
Cat Calorie Calculator
Calculate your cat's daily calorie needs using the veterinary-approved RER formula. Enter weight and condition to get Resting Energy Requirement (RER) and Maintenance Energy Requirement (MER) in kcal per day.
Cat Chocolate Toxicity Calculator
Check if your cat has eaten a toxic amount of chocolate. Calculate theobromine and caffeine dose based on cat weight, chocolate type, and amount ingested. Get an immediate prognosis for your pet.
Cat Pregnancy Due Date Calculator
Calculate your cat due date from the mating date using the average 63-day gestation period. Free cat pregnancy calculator with due date range, gestation week, and trimester tracking for cat owners and breeders.
Cat Quality Of Life
Assess your cat QOL with the HHHHHMM Scale. Score hurt, hunger, hydration, hygiene, happiness, mobility, and good days from 1-10 for hospice care decisions.
Catculator — Cat Population Growth Calculator
Calculate cat population growth over a single period using initial population size and annual growth rate. Free online biology calculator with charts and breakdowns for veterinarians and wildlife managers.
Cattle Per Acre Calculator
Calculate pasture stocking rate from forage yield and cattle type. Free cattle per acre calculator with Animal Unit conversion and forage balance charts.
Cell Dilution Calculator
Calculate cell suspension dilutions using the C₁V₁ = C₂V₂ formula. Free online biology calculator for initial concentration, volume, final concentration, and dilution factor with charts.
Cell Doubling Time Calculator
Calculate cell doubling time, growth rate, and number of generations from initial and final cell concentrations over a given time period. Free online biology calculator with growth charts for cell culture research.
Cephalexin For Cats Dosage
Calculate the right cephalexin antibiotic dosage for your cat by weight with tablet and liquid measurements. Free online veterinary medicine calculator with safety warnings.
Cephalexin for Dogs Dosage Calculator
Calculate the correct cephalexin antibiotic dose for your dog by weight with tablet and liquid measurements. Free online veterinary dosage calculator with safety warnings and charts.
CO₂ Grow Room Calculator
Calculate how much CO₂ to add to your grow room for optimal plant growth. Enter room dimensions, current and target CO₂ levels, and get precise CO₂ volume and flow rate with interactive charts.
Compost Calculator
Calculate how much compost you need for your garden, raised bed, or lawn. Enter length, width, and depth to get precise volume in cubic feet and cubic yards, weight, bag count, and cost with charts.
Corn Yield Calculator
Calculate corn yield per acre and total bushel production from a 1/1000 acre sample. Free corn yield estimator for farmers and agronomists with interactive charts and breakdowns.
Cow Gestation
Calculate your cow calving date and postpartum interval from the exposure or insemination date using the average 283-day cattle gestation period. Free online gestation calculator for farmers, ranchers, and veterinarians.
Cricket Chirp Thermometer
Estimate outdoor temperature by counting cricket chirps using Dolbear's law. Free online biology calculator for field crickets, snowy tree crickets, and katydids with instant °F and °C results and species comparison chart.
Daily Light Integral (DLI) Calculator
Calculate Daily Light Integral (DLI) from PPFD and photoperiod for optimal plant growth. Free online horticulture calculator for growers and greenhouse managers with interactive charts.
Dihybrid Cross Punnett Square Calculator
Calculate dihybrid cross Punnett square genotype and phenotype ratios for two traits with four alleles. Free online genetics calculator with Punnett square grid, charts, and probability breakdowns.
DNA Concentration Calculator
Calculate DNA concentration from A260 absorbance using Beer-Lambert law conversion factors. Free spectrophotometry calculator with purity ratio and DNA yield.
DNA Copy Number Calculator
Calculate DNA copy number per microliter from DNA concentration and template length. Free online molecular biology calculator for PCR and qPCR with dsDNA, ssDNA, and ssRNA support.
DNA to mRNA Converter
Convert DNA sequences to mRNA using complementary base pairing rules (A→U, T→A, C→G, G→C). Free online transcription calculator with protein translation and base composition charts for molecular biology students and researchers.
Dog Age Calculator
Convert your dog age to human-equivalent years based on breed size using the veterinary formula. Free online dog age calculator with life stage classification and chart.
Dog BMI Calculator
Calculate your dog BMI using weight and height with the standard BMI formula. Free online dog body mass index calculator with healthy weight assessment, charts, and breakdowns for pet owners and veterinarians.
Dog Calorie Calculator
Calculate your dog daily calorie needs using the veterinary RER formula. Enter weight and activity level to get RER and MER in kcal per day with charts and breakdowns.
Dog Chocolate Toxicity Calculator
Check if your dog has eaten a toxic amount of chocolate. Calculate methylxanthine dose, theobromine and caffeine levels from dog weight, chocolate type, and amount ingested with prognosis.
Dog Crate Size
Find the right dog crate size for your pup by entering height and length measurements. Get recommended crate height and length with extra space for comfort and safety.
Dog Food Calculator
Calculate your dog daily food and calorie needs using the veterinary RER formula with weight and activity type. Get RER, MER, and feeding amount with charts.
Dog Harness Size
Find the perfect dog harness size by entering your dog weight and chest girth. Get recommended size from XX-Small to X-Large with leash width and breed examples for pet owners worldwide.
Dog Heat Cycle Calculator
Track your female dog heat cycle by entering the last heat start date and breed size. Get next heat window, fertile period, ovulation date, and current cycle stage with charts.
Dog Life Expectancy
Find your dog expected lifespan based on breed with average minimum and maximum life expectancy. Free online tool with comparison charts for pet owners and veterinarians.
Dog Metacam Dosage Calculator
Calculate the correct Metacam (meloxicam) dosage for your dog by entering weight and selecting the medication form. Get day 1 loading dose and maintenance dose with precise volume or tablet count for safe veterinary dosing.
Dog Onion Toxicity
Check if your dog has eaten a toxic amount of onions. Enter weight and onion amount to calculate toxic and serious toxicity thresholds with severity assessment and veterinary guidance for pet owners worldwide.
Dog Pregnancy Due Date Calculator
Calculate your dog due date from the mating date using the average 63-day gestation period. Free dog pregnancy calculator with due date range, gestation week, and trimester tracking for dog owners and breeders.
Dog Quality Of Life
Assess your dog QOL using Dr. Mary Gardner Quality of Life Scale. Score mobility, nutrition, hydration, elimination, interaction, and favorite things 1-10 for hospice care decisions.
Dog Raisin Toxicity Calculator
Check if the raisins your dog ate could be toxic. Calculate toxic threshold, amount eaten, and severity based on dog weight, raisin size, and raisin count with veterinary guidance.
Dog Size Calculator
Predict your puppy adult size using weight and age in weeks. Free dog size calculator with breed classification, adult weight range, and max height estimate.
Dog Water Intake Calculator
Calculate how much water your dog should drink daily based on weight and activity level. Get daily water intake in ml, cups, and fl oz with comparison charts for dog owners.
Dry Matter Basis Calculator (Pet Food)
Convert pet food as-fed to dry matter basis. Compare protein, fat, and fiber across dog and cat foods with moisture removed for accurate nutrition comparison.
Feed Conversion Ratio (FCR) Calculator
Calculate feed conversion ratio for poultry, cattle, pigs, and fish. Free online FCR calculator with weight gain analysis and efficiency charts for farmers.
Fertilizer Calculator
Calculate how much fertilizer you need for your lawn or garden based on area, NPK ratio, and desired nitrogen application rate per 1000 sq ft with charts and breakdowns.
Fish Oil Dosage For Cats
Calculate safe fish oil (EPA and DHA) dosage for your cat by weight. Get the recommended daily dose in mg, liquid volume in mL, and approximate drops for cats with standard and CKD guidelines.
Growing Degree Units (GDU) Calculator
Calculate Growing Degree Units (GDU) for corn, wheat, soybeans, and other crops. Free heat accumulation calculator with temperature charts and breakdowns for farmers and agronomists.
Goat Gestation Calculator — Kidding Date & Due Date
Calculate your goat kidding date from the breeding date using the average 150-day gestation for standard breeds or 145 days for miniature breeds. Free goat gestation calculator with kidding range and timeline chart for farmers and breeders.
Grain Bin Capacity Calculator
Calculate grain bin capacity in bushels and cubic feet for round bins with peaked roof and hopper options. Free online grain bin bushel calculator with weight estimates for corn, wheat, and soybeans.
Grain Conversion Calculator
Convert grain quantities between bushels, pounds, kilograms, and metric tons for corn, wheat, soybeans, barley, oats, and other agricultural commodities. Free online grain unit converter using USDA standard test weights with interactive charts and breakdowns for farmers, traders, and agronomists.
Grass Seed Calculator
Calculate how much grass seed you need for your lawn based on area, grass type, and coverage rate in lbs per 1000 sq ft. Free online lawn grass seed calculator with charts and breakdowns for homeowners and landscapers.
Guinea Pig Age Calculator
Convert your guinea pig age to human-equivalent years using the veterinary-approved conversion chart. Free online guinea pig age calculator with life stage classification and age comparison chart.
Guinea Pig Pregnancy Due Date Calculator
Guinea pig pregnancy due date calculator from breeding date using 65-day gestation (59-72 day range). Get expected delivery date, timeline chart, and progress tracking for guinea pig owners.
Hamster Age Calculator
Convert your hamster age to human-equivalent years using the veterinary-approved conversion chart. Free online hamster age calculator with life stage classification and age comparison chart.
Horse Gestation Calculator — Mare Due Date & Foaling Date
Calculate your mare foaling date from breeding date using the 338-day average horse gestation period. Free horse due date calculator with foaling range chart.
Horse Weight Calculator
Estimate your horse body weight using the Martinson formula based on heart girth, body length, height, and neck circumference. Free online horse weight estimator for Arabians, ponies, and stock horses with charts and breakdowns.
How Big Will My Cat Get
Predict how big your kitten will grow as an adult cat using current weight and age in weeks. Free cat size calculator with adult weight estimate, weight range, and growth charts for cat owners and breeders.
Ligation Calculator — DNA Insert Mass for Cloning
Calculate the required insert mass for DNA ligation reactions using vector length, insert length, vector mass, and molar ratio. Free molecular biology ligation calculator with molar amount breakdown for cloning experiments.
Livestock Fence Cost Calculator
Estimate livestock fencing costs including posts, wire strands, and labor. Free online livestock fence cost calculator with material breakdowns and cost distribution charts for farmers and ranchers.
Llama & Alpaca Gestation Calculator — Cria Due Date
Calculate the expected cria due date for your llama or alpaca from the mating date using the average 342-day gestation period. Free gestation calculator with timeline chart for breeders.
Log Reduction Calculator
Calculate microbial log reduction from initial and final CFU counts using the log₁₀ formula. Free online microbiology calculator for disinfectant efficacy validation with percentage reduction, reduction factor, and charts.
Metacam Dosage Calculator for Cats
Calculate the correct Metacam (meloxicam) dosage for your cat by weight and medical indication. Get first 24h loading dose and daily maintenance dose with injection volume and oral drops for safe veterinary dosing.
MLVSS Calculator — Mixed Liquor Volatile Suspended Solids
Calculate MLVSS for wastewater with lab filtration and ignition methods. Free MLVSS calculator for environmental engineers and wastewater operators with charts.
Mowing Cost Calculator
Calculate lawn mowing cost by area and price per sq ft. Estimate mowing time with mower speed, deck width, and efficiency for homeowners and landscapers.
Mutation Frequency Calculator
Calculate mutation frequency in a cell population using the μ = m/N formula. Free biology genetics calculator for microbiology and cancer research with charts.
Omega 3 For Dogs Dosage Calculator
Calculate the recommended omega-3 (EPA and DHA) dosage for your dog based on weight and health condition using NRC veterinary guidelines. Free dog omega-3 dosing tool with charts and breakdowns for osteoarthritis, kidney disease, and more.
Pet Sitter Rates
Calculate pet sitting costs by service type, number of pets, visits per day, and duration. Free online pet sitter rates calculator with charts and cost breakdown for pet owners and sitters worldwide.
Pine Straw Calculator
Calculate how many bales of pine straw you need to cover your garden or landscaping area. Enter length, width, and coverage per bale to get the exact bale count and total cost instantly.
Plant Population Calculator
Plant population calculator for farmers and gardeners. Enter field dimensions, plant and row spacing to get total plants per acre and hectare with charts.
Plant Spacing Calculator — Garden Bed Plant Layout
Calculate how many plants fit in your garden bed based on bed dimensions and plant spacing. Free garden bed plant spacing calculator with charts and breakdowns for gardeners and landscapers.
Potting Soil Calculator
Calculate exactly how much potting soil you need for rectangular or round planters. Enter planter dimensions, number of planters, and bag size to get precise soil volume in cubic feet, liters, quarts, gallons, and bags needed with cost.
Protein Concentration Calculator
Calculate protein concentration from A280 absorbance using the Beer-Lambert law for BSA, IgG, Lysozyme and custom proteins. Free spectrophotometry calculator for molecular biology and biochemistry labs.
Protein Molecular Weight Calculator
Compute protein weight from any amino acid sequence with precise masses. Free kDa calculator for biochemistry, Western blot, and molecular biology research.
Punnett Square Calculator
Calculate monohybrid cross Punnett square genotype and phenotype ratios for one trait with two alleles. Free online genetics calculator with Punnett square grid, charts, and probability breakdowns.
qPCR Efficiency Calculator
Calculate qPCR efficiency from standard curve slope. Get amplification factor and acceptability check for your PCR assay validation with interactive charts.
Rabbit Cage Size Calculator
Calculate the minimum rabbit cage size based on rabbit body length, hop distance, and standing height. Free rabbit hutch size calculator with dimension charts and breakdowns.
Rabbit Color Genetics Calculator
Predict rabbit offspring coat colors using the five main gene groups (A, B, C, D, E). Free rabbit color genetics calculator with Punnett squares, probability charts, and genotype breakdowns for rabbit breeders and genetics enthusiasts.
Rabbit Gestation Calculator
Calculate your rabbit due date from conception using breed-specific gestation periods (27-42 days). Free rabbit pregnancy calculator with palpation date, nest box date, and due date range for breeders and pet owners.
Raised Bed Soil Calculator
Calculate topsoil, compost, and aeration volume for your raised garden beds. Enter bed dimensions and pick a soil mix recipe for precise ingredient amounts.
Rat Cage Size Calculator
Calculate the ideal rat cage size based on cage height, length, and width. Get cage volume in cubic feet and liters with max rats recommendation and space per rat analysis for pet owners and breeders worldwide.
Raw Dog Food Calculator (BARF Diet)
Calculate daily raw dog food portions for the BARF diet by dog weight and life stage. Get breakdowns for muscle meat, bone, organs, and vegetables with charts.
Sod Calculator — Lawn Sod Rolls & Cost
Calculate how many rolls of sod you need to cover your lawn or garden area. Free sod calculator with area, waste factor, roll count, and total cost with charts and breakdowns for homeowners and landscapers.
The Cost of Owning a Dog
Calculate the total cost of owning a dog including one-time expenses and monthly/annual recurring costs for food, vet care, grooming, and insurance. Free dog ownership cost calculator with breakdowns and charts.
Tramadol For Dogs Dosage Calculator
Calculate safe tramadol dosage for dogs by weight using BSAVA veterinary guidelines. Get lower dose, upper dose, and maximum safe dose in mg with charts and dosing frequency recommendations.
Tree Age Calculator
Estimate a tree age by species and trunk circumference using the growth factor formula. Free online tree age estimator for arborists and nature lovers.
Tree Diameter
Calculate tree diameter at breast height (DBH) from circumference using d = C / π. Free tree diameter calculator with bark thickness support for arborists and forestry professionals.
Tree Height Calculator
Measure tree height using trigonometry (angle method) or shadow (similar triangles) formulas. Free online tree height estimator with distance, angle, and shadow measurements for arborists and landscapers.
Tree Leaves Calculator
Estimate leaves on any tree using the plate sample and LAI method. Free calculator with leaf count, autumn bags, and pile volume for gardeners and arborists.
Tree Spacing Calculator
Calculate how many trees you can plant in any area using rectangular spacing. Free tree spacing calculator for orchards, gardens, and farms with per-acre estimates and charts.
Tree Value Calculator
Calculate the monetary value of a tree by species, circumference, and height using the basic value formula. Free online tree worth estimator for arborists, homeowners, and property appraisers.
Trihybrid Cross Punnett Square Calculator
Calculate trihybrid cross Punnett square genotype and phenotype ratios for three traits with six alleles. Free online genetics calculator with 8x8 Punnett square grid, charts, and probability breakdowns.
Turtle Tank Size Calculator
Calculate the recommended turtle tank size based on species and shell length using the 10-gallon-per-inch rule. Get tank volume in gallons and liters with species-specific adult size estimates for healthy pet turtle care.
Vapor Pressure Deficit (VPD) Calculator
Calculate VPD for plants from air temperature and relative humidity. Free Vapor Pressure Deficit calculator for greenhouse and indoor garden growth conditions.
Vegetable Yield
Estimate home vegetable garden harvest yield by crop type row length and number of rows. Free garden planner with yield charts breakdowns and 30+ vegetable options for growers.
Water Potential Calculator
Calculate plant water potential using the formula Ψ = ψs + ψp with solute concentration, ionization constant, temperature, and pressure potential for biology students and researchers.
Basal Area Calculator
Calculate tree basal area from diameter at breast height (DBH) for forestry stand density, timber volume estimation, and ecological carbon stock assessment.