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Frequency Converter

Hz, kHz, MHz, GHz, rpm, rad/s and BPM — plus period and wavelength.

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Quick Tool Overview

The Frequency Converter converts between hertz and its SI multiples, rpm, revolutions per second, radians per second, degrees per second and beats per minute, and reports the period, angular frequency and wavelength.

What it does
Converts frequency and rotational speed
You give it
A frequency and its unit
You get back
The result, period, wavelength and a unit table
Best for
Electronics, radio, motors and audio work
Converters Free, unlimited use No sign-up Runs in your browser

About the Frequency Converter

Frequency is simply how often something repeats, but it is quoted very differently depending on what is repeating. Radio and electronics use hertz with SI prefixes, motors and turntables use revolutions per minute, control engineering uses radians per second and music uses beats per minute.

Enter a value and its unit to get any other unit, with a full table beneath. The converter also reports the period of one cycle, the angular frequency, and the wavelength a wave at that frequency would have in a vacuum, which is the figure radio and optics people usually want next.

Key features of the Frequency Converter

Rotation and oscillation together

rpm and rad/s convert directly to hertz, so a motor speed and a signal frequency can be compared.

Period of one cycle

The time for one cycle is shown in the most readable unit, from seconds down to picoseconds.

Wavelength in a vacuum

The electromagnetic wavelength is calculated from the speed of light, useful for antennas and optics.

Terahertz to millihertz

Twelve units cover everything from slow sensor cycles to terahertz radiation.

Presets for common questions

Wi-Fi bands, mains frequency and tempo conversions are one click away.

How to use the Frequency Converter

  1. 1

    Enter the frequency

    Type the value — 50, 2.4, 1500 — in whatever unit you have.

  2. 2

    Choose the units

    Select the source and target units, or use a preset such as 50 Hz to rpm.

  3. 3

    Read period and wavelength

    The time for one cycle and the wavelength in a vacuum are shown under the result.

  4. 4

    Copy from the table

    Every unit is listed; click any value to copy it.

Frequently asked questions

Divide by 60. A motor turning at 1,500 rpm completes 25 revolutions per second, which is 25 Hz.

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