Frequency Converter
Convert frequency between hertz and its multiples, revolutions per minute, beats per minute, and radians per second. A cycle is a cycle whether it is an engine turning, a speaker moving, or a metronome ticking, so all of these measure the same thing at different scales.
Converters
Private by default
This tool runs entirely in your browser. Your data is never uploaded to a server.
How it works
Cycles per second, under different names
1 Hz = 1 cycle/s = 60 rpm = 60 BPM = 2π rad/s · period = 1 ÷ frequency
Hertz counts complete cycles per second. Revolutions and beats per minute count the same cycles over a minute, and radians per second measures the angle swept rather than the cycles completed — one cycle being 2π radians.
- Angular frequency (rad/s) is what physics and control-system formulas use; ω = 2πf.
- Mains electricity is 50 Hz across most of the world and 60 Hz in North America — the reason some appliances are region-specific.
- Wi-Fi bands are named in GHz (2.4 and 5) while channel widths are quoted in MHz; 1 GHz is 1,000 MHz.
- Audio sample rates such as 44.1 kHz are frequencies too: 44,100 samples every second.
For reference
Frequencies worth recognising
| What | Value | In hertz |
|---|---|---|
| Mains electricity, Europe | 50 Hz | 50 |
| Metronome at 120 BPM | 120 BPM | 2 |
| Car engine at 3,000 rpm | 3,000 rpm | 50 |
| Concert pitch A above middle C | 440 Hz | 440 |
| CD audio sample rate | 44.1 kHz | 44,100 |
| Wi-Fi 2.4 GHz band | 2.4 GHz | 2,400,000,000 |
A gaming monitor's 144 Hz refresh rate is the same kind of number: 144 complete frames every second.
How to use
4 clear steps.
Enter the frequency value.
Select its unit (Hz, MHz, rpm, BPM…).
Select the target unit and read the result.
Check the full table to see every unit for the same frequency.
Good to know
Frequently asked questions
- How do I convert rpm to Hz?
- Divide by 60, because a hertz is one cycle per second and rpm counts cycles per minute. An engine at 3,000 rpm is turning at 50 Hz.
- Is BPM the same as rpm?
- Numerically yes — both count cycles per minute, so 120 BPM and 120 rpm are both 2 Hz. They are listed separately because musicians and engineers look for different words.
- How is frequency related to period?
- They are reciprocals: period = 1 / frequency. A 50 Hz signal repeats every 0.02 seconds, and a 2.4 GHz carrier every 0.417 nanoseconds.