Frequency Converter

What this tool does

Frequency Converter switches between electrical, rotational, musical and angular frequency units. Because period and wavelength are the inverse of frequency, it also converts to and from those, handy for radio, audio and electronics work.

Frequency means "how many times per second", but different fields express it differently. Electronics uses hertz with SI prefixes, motors and drives use revolutions per minute, musicians count beats per minute, physicists write angular frequency in radians per second, and radio operators often talk in wavelengths such as the 2-metre band. Moving between these needs both simple factors and inverse relationships.

This tool uses the hertz (one cycle per second) as its base. Rpm and BPM divide by 60, and angular frequency uses ω = 2πf. Period is the reciprocal T = 1/f, and wavelength in a vacuum is λ = c/f with the exact speed of light, 299,792,458 m/s. Those inverse units are converted with reciprocals, so a frequency of zero shows a dash rather than a misleading number. Calculations run locally.

How to use Frequency Converter

1. Enter a value in the Value field.
2. Select its unit in From, for example Megahertz.
3. Select the target in To, for example Wavelength in vacuum (metres).
4. Read the Result and copy it, or swap the direction.
5. Check the table for the same value as rpm, period, wavelength and every other unit.
6. Use Batch convert to process a list of channel or clock frequencies.

Tips for better results

• A quick radio rule: wavelength in metres ≈ 300 ÷ frequency in MHz.
• Mains electricity is 50 Hz in India and Europe (period 20 ms) and 60 Hz in North America (16.7 ms).
• A motor at 3,000 rpm turns 50 times per second, or 50 Hz.
• For sound in air, divide 343 m/s by the frequency instead; this tool assumes light speed.

Common use cases

• Converting radio frequencies to wavelengths for antenna design.
• Converting motor speeds between rpm, Hz and rad/s for engineering calculations.
• Turning oscilloscope periods into frequencies and back.
• Converting music tempo in BPM to hertz for audio effects such as LFOs.

Common mistakes to avoid

• Using ordinary frequency in a formula that expects angular frequency, which is 2π times larger.
• Applying the electromagnetic wavelength formula to sound waves.
• Confusing MHz (megahertz) with mHz (millihertz), a factor of one billion.