Toolcroft

Frequency Converter - Hz, kHz, MHz, GHz, RPM & rad/s

Unit Converters

Convert Hz, kHz, MHz, GHz, THz, RPM, RPS, and rad/s with live results, all-unit equivalents, frequency presets, and period hints in your browser.

Period (T = 1/f): 1 nsA zero frequency has no finite period.

Common frequency references

All supported units

Based on the current From value in Megahertz (MHz). Angular frequency uses ω = 2πf.

SI

  • Hertz (Hz)1000000000
  • Kilohertz (kHz)1000000
  • Megahertz (MHz)Current input1000
  • Gigahertz (GHz)1
  • Terahertz (THz)0.001

Rotational

  • Revolutions per minute60000000000
  • Revolutions per second1000000000

Angular

  • Radians per second (rad/s)6283185300

How to use this tool

  1. Enter a value. Type a frequency or rotation rate in the From field, or start with a common reference preset.
  2. Choose units. Select source and target units from the SI, Rotational, or Angular groups. You can also enter a value in the To field to convert in the reverse direction.
  3. Read or copy results. The paired result, all supported unit equivalents, and the period hint update as you edit either input. Use a row copy button to copy any equivalent.

Common frequency conversions

ValueEquivalent
1 kHz1,000 Hz
1 MHz1,000 kHz = 1,000,000 Hz
1 GHz1,000 MHz = 10⁹ Hz
1 THz1,000 GHz = 10¹² Hz
60 RPM1 Hz = 1 rev/s
3,600 RPM60 Hz
60 Hz376.991 rad/s (2π × 60)

How frequency conversion works

All conversions pass through Hertz (Hz) as the base unit. 1 Hz means one cycle per second. SI prefixes apply: kHz = 10³ Hz, MHz = 10⁶ Hz, GHz = 10⁹ Hz, THz = 10¹² Hz.

RPM (revolutions per minute) converts to Hz by dividing by 60. For example, 3,000 RPM = 50 Hz.

Frequency in audio

The human hearing range spans approximately 20 Hz to 20,000 Hz (20 kHz), though high-frequency sensitivity declines significantly with age (a process called presbycusis). Each musical octave doubles the frequency: A4 = 440 Hz, A5 = 880 Hz, A3 = 220 Hz. The frequency range is divided into sub-bass (20–60 Hz), bass (60–250 Hz), midrange (250 Hz–4 kHz), presence (4–6 kHz), and brilliance/air (6–20 kHz).

Frequency in the electromagnetic spectrum

BandFrequency rangeExample uses
AM radio535–1,605 kHzAmplitude-modulated broadcast radio
FM radio88–108 MHzFrequency-modulated broadcast radio
WiFi 2.4 GHz2,400–2,484 MHz802.11b/g/n wireless LAN
WiFi 5 GHz5,150–5,850 MHz802.11a/ac/ax wireless LAN
Visible light~400–750 THzViolet (750 THz) to red (400 THz)

Angular frequency

Angular frequency ω (omega) is related to ordinary frequency f in Hz by ω = 2πf and is measured in radians per second (rad/s). Select Radians per second from the Angular group to convert it directly. For example, a 60 Hz power grid has an angular frequency of 2π × 60 ≈ 376.991 rad/s. This form is common in physics and signal equations because it incorporates the 2π factor used for each cycle.

Frequently asked questions

What is the difference between Hz and RPM?

Hertz measures cycles or revolutions per second, while RPM measures revolutions per minute. For a rotating shaft, divide RPM by 60 to express its rotation rate in revolutions per second (Hz).

How do I convert RPM to Hz?

Divide RPM by 60. For example, 3,000 RPM ÷ 60 = 50 revolutions per second, or 50 Hz.

What does rad/s mean?

Radians per second measure angular frequency. Convert ordinary frequency f in hertz with ω = 2πf; for example, 60 Hz equals about 376.991 rad/s. Choose the Angular group to convert rad/s in this tool.

How are MHz and GHz related?

One gigahertz is 1,000 megahertz. Divide a value in MHz by 1,000 to get GHz, so 2,400 MHz equals 2.4 GHz.

How do I find the period from a frequency?

For a positive frequency f, the period is T = 1/f. The hint above the unit list shows that reciprocal in a suitable time unit; zero frequency has no finite period.

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