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Frequency Converter

Convert Hz, kHz, MHz, GHz, THz, rpm, rad/s and BPM

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Type the frequency you want to convert into the frequency value field.
  2. 2.Choose the source unit under 'From' and the target unit under 'To' — Hz, kHz, MHz, GHz, THz, mHz, rpm, BPM, rad/s or deg/s.
  3. 3.Read the converted result instantly, or tick 'Show all units at once' to see every unit from millihertz to terahertz together.

About Frequency Converter

A frequency converter changes how often something repeats between hertz (Hz), kilohertz (kHz), megahertz (MHz), gigahertz (GHz), terahertz (THz), millihertz (mHz), and rate units like revolutions per minute (rpm), beats per minute (BPM), radians per second (rad/s), and degrees per second (deg/s) — instantly and entirely in your browser, with nothing uploaded. Every conversion routes through hertz, the SI unit for one cycle per second, so any pair of units stays exact and consistent.

The SI prefixes handle the plain scaling. Following the BIPM definitions, kilo is 10^3, mega is 10^6, giga is 10^9, and tera is 10^12, while milli is 10^-3. That makes 1 kHz = 1000 Hz, 1 MHz = 1,000,000 Hz, 1 GHz = 1,000,000,000 Hz, and 1 THz = 1,000,000,000,000 Hz. Each step up the ladder is a factor of 1000, which is exactly why converting hz to khz, khz to mhz, or mhz to ghz just moves the decimal point three places. Millihertz runs the other way at one thousandth of a hertz, useful for very slow oscillations.

Angular frequency is the part people most often get wrong. Angular frequency (omega) is measured in radians per second and relates to ordinary frequency f by omega = 2*pi*f, because one full cycle sweeps 2*pi radians. So 1 Hz equals 2*pi, about 6.283185 rad/s, and going the other way, 1 rad/s = 1/(2*pi), about 0.159155 Hz. Notice the direction: a value in rad/s is roughly 6.28 times larger than the same frequency written in Hz, so 1 rad/s is a smaller frequency than 1 Hz. This tool uses 2*pi exactly rather than a rounded 6.2832, so the round trip Hz to rad/s and back returns your original number. Degrees per second follows the same idea with a full turn of 360 degrees, giving 1 deg/s = 1/360 Hz.

Revolutions per minute (rpm) and beats per minute (BPM) are per-minute rates, so both equal 1/60 Hz: 60 rpm = 1 Hz and 120 BPM = 2 Hz. They share identical math but different worlds — rpm describes spinning engines, hard drives, and motors, while BPM describes musical tempo and heart rate. Because this converter keeps them as separate labels, you can move between a drummer's 128 BPM, a motor's 3000 rpm, and a clean 50 Hz mains figure without doing the arithmetic by hand.

Typical uses span audio and music (Hz and BPM), radio and wireless (kHz, MHz, GHz), processors and signal timing (MHz, GHz), light and spectroscopy (THz), and rotating machinery (rpm, rad/s). Enter any number, choose your source and target units, and read the answer immediately; tick 'Show all units at once' to see the full ladder from millihertz to terahertz alongside rpm, BPM, rad/s, and deg/s. Everything runs client-side, so your values never leave your device.

Frequently asked questions

How do I convert Hz to kHz and MHz to GHz?
Each SI step is a factor of 1000. To go hz to khz, divide by 1000 (2500 Hz = 2.5 kHz); the same jump applies from kHz to MHz and mhz to ghz. Going the other way you multiply by 1000, so 1 GHz = 1000 MHz = 1,000,000 kHz = 1,000,000,000 Hz.
How do you convert rad/s to Hz?
Angular frequency and frequency are linked by omega = 2*pi*f, since one cycle is 2*pi radians. To get Hz, divide rad/s by 2*pi: 1 rad/s = 1/(2*pi) ≈ 0.159155 Hz. To get rad/s, multiply Hz by 2*pi: 1 Hz = 2*pi ≈ 6.283185 rad/s. A rad/s value is a smaller frequency than the same number in Hz.
How do you convert rpm to Hz?
Revolutions per minute are per-minute, so divide by 60: 1 rpm = 1/60 Hz ≈ 0.016667 Hz, which means 60 rpm = 1 Hz and 3000 rpm = 50 Hz. To turn Hz back into rpm, multiply by 60.
Is BPM the same as Hz?
Not directly. BPM (beats per minute) is a per-minute rate, so it equals 1/60 Hz — the same math as rpm. A 120 BPM tempo is 2 Hz, and 60 BPM is 1 Hz. BPM keeps the musical or heart-rate label while Hz states cycles per second.
What is the difference between frequency and angular frequency?
Frequency f (in Hz) counts complete cycles per second. Angular frequency omega (in rad/s) counts radians swept per second, and because one full cycle is 2*pi radians, omega = 2*pi*f. They describe the same motion in different units, which is why 1 Hz equals 2*pi rad/s.

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