How do I convert Hz to kHz, MHz and GHz?

Each step up is a factor of 1000. 1 kHz = 1,000 Hz, 1 MHz = 1,000,000 Hz, and 1 GHz = 1,000,000,000 Hz. So 2,400,000,000 Hz is 2,400,000 kHz, 2,400 MHz, or 2.4 GHz — the same frequency written four ways.

How is RPM related to frequency in hertz?

RPM is revolutions per minute, and frequency in Hz is cycles per second. Since one minute is 60 seconds, 60 RPM equals 1 Hz. To go from RPM to Hz divide by 60; to go from Hz to RPM multiply by 60. A 3,000 RPM motor spins at 50 Hz.

What is the period of a frequency?

The period is the time taken for one complete cycle, in seconds. It is the reciprocal of frequency: T = 1 / f. A 50 Hz mains signal has a period of 0.02 seconds (20 ms), and a 1 GHz processor clock has a period of 1 nanosecond.

How do I convert a period back into a frequency?

Frequency is one divided by the period: f = 1 / T. If one cycle takes 0.001 seconds (1 ms), the frequency is 1 / 0.001 = 1,000 Hz, or 1 kHz. This tool lets you type straight into the period field to do exactly that.

Why does the period field behave differently from the others?

Hz, kHz, MHz, GHz and RPM are all linear multiples of one another, so doubling one doubles them all. The period is the inverse of frequency, so a higher frequency gives a shorter period. The converter handles that reciprocal relationship for you so the numbers stay exact.

Is my data sent anywhere?

No. Every conversion is pure arithmetic done in your browser with no network calls, and your last entry is saved only on your own device. Nothing is uploaded or stored on a server.

Frequency Converter — Gera Tools

A complete frequency converter that moves a value between hertz (Hz), kilohertz (kHz), megahertz (MHz), gigahertz (GHz), revolutions per minute (RPM) and the signal’s period in seconds — all at once. Type a number into any one field and every other field updates live, so you never hunt for a convert button. It is built for electronics hobbyists, audio and radio engineers, students checking homework, and anyone who needs to read a clock speed, a motor’s RPM, or a mains frequency in whatever unit suits the job.

How it works

Frequency measures how many times something repeats each second. The SI unit is the hertz, where 1 Hz means one cycle per second. The metric prefixes scale it in steps of one thousand: 1 kHz is 1,000 Hz, 1 MHz is 1,000,000 Hz, and 1 GHz is 1,000,000,000 Hz. Because these are all plain multiples, the tool converts everything through a single canonical value in hertz and then fans that value back out to each unit.

RPM (revolutions per minute) is also a frequency, just measured per minute instead of per second. Since a minute is 60 seconds, 60 RPM equals 1 Hz — divide RPM by 60 to get hertz, or multiply hertz by 60 to get RPM. The period is the odd one out: it is the time for a single cycle and is the reciprocal of frequency, T = 1 / f. A higher frequency always means a shorter period, so the converter computes that inverse separately to keep the maths exact. Enter a period and it returns the matching frequency via f = 1 / T; enter a frequency and it returns the period.

Worked example

Say you have a Wi-Fi radio running at 2.4 GHz and you want every other unit. Type 2.4 into the GHz field. Instantly you see 2,400 MHz, 2,400,000 kHz and 2,400,000,000 Hz. The RPM field shows 144,000,000,000 (rarely useful for radio, but exact), and the period reads about 0.417 nanoseconds — the time for one full oscillation of the signal. Now type 3000 into the RPM field instead and you immediately get 50 Hz, a 0.05 kHz value, and a 0.02 second period: exactly what a 3,000 RPM motor or a 50 Hz European mains supply looks like.

Conversion reference

Hz	kHz	MHz	GHz	RPM	Period
1 Hz	0.001	0.000001	0.000000001	60	1 s
50 Hz	0.05	0.00005	0.00000005	3,000	20 ms
60 Hz	0.06	0.00006	0.00000006	3,600	16.67 ms
1,000 Hz	1	0.001	0.000001	60,000	1 ms
1,000,000 Hz	1,000	1	0.001	60,000,000	1 microsecond
1,000,000,000 Hz	1,000,000	1,000	1	60,000,000,000	1 ns
2,400,000,000 Hz	2,400,000	2,400	2.4	144,000,000,000	0.417 ns

Every figure above is recomputed in your browser from the exact factors (1 kHz = 1,000 Hz, 60 RPM = 1 Hz, T = 1 divided by f), so the table can never drift out of step with the live tool. Nothing you type is uploaded or stored anywhere off your device.