CodesBeautify

Frequency Converter

Convert frequencies across the hertz family and into rotational units such as RPM and rad/s.

Values
Converted
Runs locally in your browser

About the Frequency Converter

One hertz is one cycle per second, and everything else on this page is that idea rescaled or rewritten. Audio sits between roughly 20 Hz and 20 kHz, radio and Wi-Fi live in the megahertz and gigahertz range, and processor clocks are quoted in gigahertz. Paste the figures from a datasheet and read them back in whichever prefix your notes use.

Rotational units share the same dimension, so they belong here too. A revolution per minute is a sixtieth of a hertz, which means a 3000 rpm motor turns at 50 Hz and a 1500 rpm shaft at 25 Hz. Radians per second is the angular velocity form preferred in control theory and equals 2 pi hertz, so 50 Hz becomes about 314.16 rad/s. Degrees per second and beats per minute round out the set for animation timing and music tempo.

A practical note for audio work: 44100 Hz is the CD sample rate and 48000 Hz the video standard, both far above the highest audible tone because sampling has to happen at more than twice the top frequency. For radio, remember that wavelength is the speed of light divided by frequency, so a 2.4 GHz signal has a wavelength near 12.5 centimetres. If you need the angle itself rather than the rate, use the Angle Converter.

How to use

  1. Paste the frequency values, one number per line.
  2. Select the unit they are written in, for example hertz.
  3. Select the unit you want, for example kilohertz or RPM.
  4. Copy the converted values and the printed factor.

Common questions

How many hertz is 3000 RPM?
50 Hz, because one revolution per minute is one sixtieth of a hertz.
How do I convert hertz to radians per second?
Multiply by 2 pi. Select hertz as the source and radian per second as the target and the tool applies it.
What is the difference between kHz and kbps?
Kilohertz counts cycles per second while kilobits per second counts data. They measure different things and are not interchangeable.
Why is 44.1 kHz used for CD audio?
It is slightly more than twice the 20 kHz upper limit of human hearing, which is what the sampling theorem requires.