Frequency Converter

Convert frequency scales, calculate wave period durations, and estimate signal wavelengths across physical mediums.

Value

Unit

Frequency Conversions

Hertz (Hz)

1000000

Kilohertz (kHz)

1000

Megahertz (MHz)

Gigahertz (GHz)

0.001

Terahertz (THz)

0.000001

Revolutions / Second (RPS)

1000000

Revolutions / Minute (RPM)

60000000

Radians / Second (rad/s)

6283185.307

Degrees / Second (deg/s)

360000000

Wavelength Calculator (λ = v / f)

Propagation Medium

Meters (m)

299.792458

Centimeters (cm)

29979.2458

Millimeters (mm)

299792.458

Nanometers (nm)

299792458000

Wave Period (T = 1/f)

Seconds (s)

0.000001

Milliseconds (ms)

0.001

Microseconds (µs)

Nanoseconds (ns)

1000

Signal Guide

Human Hearing Lower Limit20 Hz

AC Power Grid (Europe/Asia)50 Hz

AC Power Grid (US/Americas)60 Hz

Human Hearing Upper Limit20 kHz

FM Radio Broadcasts87.5 – 108 MHz

WiFi 2.4 GHz Band2.4 GHz

WiFi 5 GHz Band5.0 GHz

Modern CPU Clock Speeds3.2 – 5.2 GHz

Visible Light Spectrum400 – 700 THz

How frequency and wave period conversions are computed

Frequency represents the count of wave cycles occurring per second (Hz). Period (T) describes the duration of a single wave cycle and is the mathematical reciprocal of frequency:T = 1 / f.

Wavelength (λ) calculates the spatial length of a wave cycle based on propagation speeds:λ = v / f, where v represents transmission speeds (such as the speed of light or sound waves in air and water).

Built and maintained by Meet Shah · Last updated 1 August 2026

What this tool is used for

Converting a frequency between Hz, kHz, MHz and GHz.
Checking a radio or WiFi band's frequency in another unit.
Converting an audio frequency for a specification.
Comparing two figures quoted in different units.
Converting an optical frequency for a calculation.

Frequently Asked Questions

What is a hertz?: One cycle per second — the SI unit, named for Heinrich Hertz. It is dimensionally the inverse of time, which is why the conversions to kHz, MHz and GHz are plain decimal steps of a thousand with no awkward factors anywhere.
How do frequency and wavelength relate?: Through the wave speed: λ = c / f. In vacuum that gives a 100 MHz FM signal a 3-metre wavelength, which is why the antenna is the size it is — antenna length is a fraction of wavelength, and that is the whole reason low frequencies need big antennas.
What does RPM convert to?: Divide by 60 for hertz — 3,000 RPM is 50 Hz. Rotational speed and frequency are the same quantity in different units, which is why a motor's rated speed and the mains frequency driving it are directly related.
Why is CPU clock speed no longer a useful comparison?: Because work per cycle diverged. Instructions per clock, core count, cache and memory bandwidth all changed independently, so a 3 GHz chip from two generations apart differs enormously in throughput. The number stopped tracking performance around the mid-2000s.
What is the audible range?: Roughly 20 Hz to 20 kHz for a young adult, with the upper limit falling steadily with age — often to 15 kHz by middle age. That range is why 44.1 kHz sampling exists: Nyquist requires more than twice the highest frequency you intend to reproduce.

Common errors and gotchas

Slipping a factor of a thousand between prefixes, which is easy across three steps.
Confusing frequency with wavelength, which are inversely related through the wave speed.
Mixing a sample rate with a frequency, where the Nyquist limit is half the rate.
Assuming a band's name matches its exact frequency, since 2.4 GHz WiFi spans a range.
Treating a clock frequency as a data rate, which encoding changes.