Frequency Converter

This free online frequency conversion tool allows you to quickly and accurately convert a frequency value into a wide range of commonly used frequency units. It is designed to support both very low and extremely high frequencies, making it suitable for a variety of scientific, technical, and everyday applications.

With this frequency calculator, you can convert between Millihertz, Hertz, Kilohertz, Megahertz, Gigahertz, and Terahertz instantly. Simply enter a value into any of the input fields, and the calculator will automatically convert and display the equivalent values across all other frequency units. This eliminates the need for manual calculations and helps ensure accurate, consistent results every time.

Enter frequency

Millihertz

mHz

Megahertz

MHz

Hertz

Gigahertz

GHz

Kilohertz

kHz

Terahertz

THz

Decimal places

Calculated in your browser as you type. Very small results can show as 0 when rounded to few decimal places.

How to use it

The frequency conversion calculator is a handy webtool to use to convert from one frequency to another.

Enter a valueType a frequency into any one of the fields. Any number is accepted, including the ‘e’ exponent such as 2.4e9.
Read the resultsAll the other fields update automatically with the converted frequencies.
Copy a valueClick the clipboard button beside any field to copy it.
Tidy the numbersUse Decimal places to round the results, or leave it on full precision.

Handy conversions

Period

The time for one cycle is 1 ÷ frequency. At 1 kHz one cycle takes 1 millisecond.

Radio wavelength

Wavelength in metres is roughly 300 ÷ frequency in MHz.

Cycles per minute

Multiply hertz by 60 to get cycles or revolutions per minute (rpm).

Frequency unit comparison table

Unit name	Symbol	Description	Equals in hertz
Millihertz	mHz	Used for very low frequencies	`0.001 Hz`
Hertz	Hz	Base unit of frequency (cycles per second)	`1 Hz`
Kilohertz	kHz	Common in audio signals and radio frequencies	`1,000 Hz`
Megahertz	MHz	Used for FM radio, processors, and wireless devices	`1,000,000 Hz`
Gigahertz	GHz	Common for CPUs, Wi-Fi, and microwave signals	`1,000,000,000 Hz`
Terahertz	THz	Used in advanced imaging and scientific research	`1,000,000,000,000 Hz`

Notes and use cases

Very low frequencies

Millihertz values are often used in geophysics and long-period signals, while hertz is the standard unit for cycles per second.

Audio and broadcasting

Kilohertz and megahertz are common in audio, broadcasting and communication systems.

Computing and research

Gigahertz frequencies are typical in modern computing and wireless technologies, and terahertz in spectroscopy, astronomy and cutting-edge research.

Frequently asked questions

What is a hertz?

A hertz (Hz) is one cycle per second. It is the standard unit of frequency, named after the physicist Heinrich Hertz.

What is the difference between mHz and MHz?

Capital and small letters matter. A lower-case m means milli (one thousandth), so 1 mHz is 0.001 Hz. A capital M means mega (one million), so 1 MHz is 1,000,000 Hz.

How many megahertz are in a gigahertz?

One gigahertz is 1,000 megahertz, 1,000,000 kilohertz and 1,000,000,000 hertz.

What frequency does Wi-Fi use?

Wi-Fi commonly uses bands around 2.4 GHz, 5 GHz and 6 GHz. Mains electricity is 50 or 60 Hz depending on the country, and FM radio sits between about 88 and 108 MHz.

Can I type very large or very small numbers?

Yes. Any number is accepted, including scientific notation such as 2.4e9 or 5e-3.

Is anything sent to a server?

No. The conversion is calculated in your browser as you type.