Frequency Converter
Free online frequency converter: convert between Hz, kHz, MHz, GHz, THz, RPM, rad/s, and deg/s. Get accurate results instantly with no registration required.
About This Calculator
The Frequency Converter is a free online tool that converts between 12 frequency units instantly. Whether you need to convert hertz to radians per second, megahertz to kilohertz, or RPM to hertz, this calculator provides accurate results for students, engineers, physicists, and hobbyists working with waves, rotational motion, audio, radio frequencies, and electrical signals.
Frequency measures the number of occurrences of a repeating event per unit time. The SI unit is the hertz (Hz), equal to one cycle per second. This converter supports the most common frequency units including hertz (Hz), kilohertz (kHz), megahertz (MHz), gigahertz (GHz), terahertz (THz), revolutions per minute (RPM), radians per second (rad/s), degrees per second (deg/s), and metric submultiples like millihertz (mHz), microhertz (μHz), nanohertz (nHz), and picohertz (pHz).
The conversion is performed by first converting the input value to hertz using a standard conversion factor, then dividing by the target unit's factor. For example, 1 MHz = 1,000,000 Hz, 1 RPM = 1/60 Hz, and 1 rad/s = 1/(2π) Hz.
Applications
Electronics & Radio: Convert between MHz, kHz, and GHz for RF engineering, radio communication, and wireless device specifications. Broadcast radio operates in the MHz range, while Wi-Fi and Bluetooth use GHz frequencies.
Mechanical Engineering: Convert between RPM and Hz for motor speeds, turbine rotation, and vibration analysis. A motor running at 3000 RPM operates at 50 Hz.
Physics & Acoustics: Convert between Hz, rad/s, and deg/s for wave mechanics, sound frequency analysis, and rotational dynamics. Angular frequency (rad/s) is essential in AC circuit analysis and simple harmonic motion.
Astronomy & Spectroscopy: Convert between GHz, THz, and Hz for spectral line analysis, radio astronomy, and cosmic microwave background measurements.
Frequently Asked Questions
How do you convert between frequency units?
To convert between frequency units, multiply the input value by the conversion factor to get hertz (Hz), then divide by the target unit's conversion factor. For example, to convert 100 MHz to Hz: 100 MHz × 1,000,000 = 100,000,000 Hz.
What is the relationship between Hz and rad/s?
The relationship is: 1 Hz = 2π rad/s ≈ 6.283 rad/s. To convert Hz to rad/s, multiply by 2π. To convert rad/s to Hz, divide by 2π. Angular frequency (ω) in rad/s is used in rotational motion and alternating current analysis.
How do I convert RPM to Hz?
To convert RPM (revolutions per minute) to Hz (hertz), divide the RPM value by 60. This is because 1 RPM equals 1/60 of a revolution per second, and 1 Hz equals 1 cycle per second. For example, 1200 RPM ÷ 60 = 20 Hz.
What is the standard unit of frequency in physics?
The SI unit of frequency is the hertz (Hz), named after German physicist Heinrich Hertz. One hertz equals one cycle per second. Common multiples include kilohertz (10³ Hz), megahertz (10⁶ Hz), gigahertz (10⁹ Hz), and terahertz (10¹² Hz).
What is the difference between frequency and angular frequency?
Frequency (f) measures cycles per second in hertz, while angular frequency (ω) measures radians per second. They are related by ω = 2πf. Angular frequency is commonly used in physics for rotational motion, oscillations, and AC circuits where phase angles matter.
What are the common frequency ranges for radio bands?
Common radio frequency bands include: ELF (3-30 Hz), SLF (30-300 Hz), ULF (300-3000 Hz), VLF (3-30 kHz), LF (30-300 kHz), MF (300-3000 kHz), HF (3-30 MHz), VHF (30-300 MHz), UHF (300-3000 MHz), SHF (3-30 GHz), EHF (30-300 GHz). These ranges are used for everything from submarine communication to satellite links.
Is the Frequency Converter free to use?
Yes, this frequency converter is completely free to use with no registration or hidden charges. You can convert between Hz, kHz, MHz, GHz, THz, RPM, rad/s, deg/s, and more instantly.
Can I share my frequency conversion results?
Yes, the URL saves your input and selected units so you can bookmark or share the exact frequency conversion calculation with others.