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Conversions

Frequency Converter

Convert between hertz, kilohertz, megahertz, gigahertz, RPM, rad/s, and more frequency units instantly.

What is Frequency Converter?

A frequency converter lets you switch between units of frequency — how many times an event repeats per second. The SI unit is the hertz (Hz). Radio waves are measured in MHz and GHz, processor speeds in GHz, sound in Hz and kHz, and rotational speed in RPM. Radians per second (rad/s) links frequency to angular velocity.

How to use

  1. 1 Enter the frequency value in the Value field.
  2. 2 Select the unit you are converting from in the From dropdown.
  3. 3 Select the unit you want to convert to in the To dropdown.
  4. 4 The result and a full table of all equivalent frequencies appear instantly.
  5. 5 Click the swap button to reverse the conversion.

Formula

converted = input_value * (factor_of_from_unit / factor_of_to_unit), where all factors are expressed relative to hertz (Hz)

Example calculation

To convert 2.4 GHz (Wi-Fi frequency) to MHz: 2.4 × 1000 = 2400 MHz. To convert 3000 RPM to Hz: 3000 / 60 = 50 Hz.

Frequently asked questions

What is the difference between Hz and RPM?

Hertz (Hz) counts cycles per second; RPM (revolutions per minute) counts full rotations per minute. 1 Hz = 60 RPM. A car engine idling at 800 RPM is turning at about 13.3 Hz.

How do I convert rad/s to Hz?

Divide radians per second by 2π (≈ 6.28318) to get Hz. For example, 100 rad/s ÷ 6.28318 = 15.92 Hz. Angular frequency ω = 2πf.

What frequency is visible light?

Visible light spans roughly 430 THz (red) to 750 THz (violet). These are terahertz frequencies — far too high for electronics but measurable as wavelengths (700–400 nm).

What is the audible frequency range?

Human hearing typically spans 20 Hz to 20,000 Hz (20 kHz). Frequencies below 20 Hz are infrasound; above 20 kHz is ultrasound. With age, the upper limit often drops to 15–16 kHz.

Why do power grids use 50 Hz or 60 Hz?

50 Hz is standard in Europe, Asia, Africa, and Australia. 60 Hz is used in North America and parts of South America. The difference dates back to early competing electrical standards — neither has a strong technical advantage over the other at these frequencies.