Frequency Converter
Convert between any two hertz units in your browser — instant, accurate, and private.
Example
1 Hz = 0.001 kHz. Switch the unit menus to convert between any pair.
How it works
Every value is converted through a single hertz base unit using internationally defined conversion factors, so any from/to pair stays consistent.
Good to know
Frequency conversion shows up anywhere something repeats over time: a CPU ticking billions of times a second, a radio station broadcasting on a fixed channel, a Wi-Fi router negotiating a band, or an engine spinning a crankshaft. The hertz family (Hz, kHz, MHz, GHz) stacks in clean powers of 1,000, while RPM measures rotational speed in revolutions per minute — so this tool bridges two very different worlds: the electronic spectrum and the mechanical shop floor.
The hertz units are pure SI, named after Heinrich Hertz, who proved electromagnetic waves existed in the 1880s. They scale decimally: 1 kHz = 1,000 Hz, 1 MHz = 1,000,000 Hz, and 1 GHz = 1,000,000,000 Hz. RPM is the odd one out — it counts whole turns per minute rather than cycles per second, which is why it lives in engine specs and motor datasheets instead of radio dials.
The handiest rule of thumb links the two systems: RPM ÷ 60 = Hz, and Hz × 60 = RPM. So 3,600 RPM is exactly 60 Hz, and 1 Hz is exactly 60 RPM. For the hertz ladder, just slide the decimal three places per step — 2.4 GHz is 2,400 MHz is 2,400,000 kHz. A useful anchor: mains electricity runs at 50 or 60 Hz, which is the same as 3,000 or 3,600 RPM for a 2-pole motor.
The classic mistake is forgetting the factor of 60 and treating RPM like a metric prefix — they are not interchangeable with the kHz/MHz jumps. Also watch the unit you actually need: "rotational frequency" in Hz is revolutions per second, not the angular frequency (rad/s) used in physics formulas, which adds a factor of 2π. And don't confuse RPM with audio frequency — a record spinning at 33⅓ RPM is only about 0.556 Hz, not anything you can hear.
Frequently asked questions
What does the frequency converter do?
It converts between common hertz units instantly. Pick a unit to convert from and a unit to convert to, type a value, and the result updates live.
Which units does this converter support?
It includes 5 units: Hertz, Kilohertz, Megahertz, Gigahertz, RPM.
Is this converter free and private?
Yes. It runs entirely in your browser, so your inputs never leave your device, there is no sign-up, and it works offline once loaded.
Are the conversions exact?
Conversions use internationally defined factors and are exact where the definitions are exact (for example, 1 inch = 2.54 cm). Displayed results are rounded for readability.
People also ask
How do you convert RPM to Hz?
Divide the RPM value by 60, since hertz counts cycles per second and there are 60 seconds in a minute. For example, 3,000 RPM ÷ 60 = 50 Hz, and 6,000 RPM = 100 Hz.
How many Hz is 1 GHz?
1 GHz equals 1,000,000,000 Hz (one billion hertz). It also equals 1,000 MHz or 1,000,000 kHz.
Is MHz faster than GHz?
No. GHz is larger — 1 GHz equals 1,000 MHz. A 3.2 GHz processor runs at 3,200 MHz, far faster than a 500 MHz chip.
What is 60 Hz in RPM?
60 Hz equals 3,600 RPM, because you multiply hertz by 60 to get revolutions per minute. This is why a 2-pole AC motor on 60 Hz mains spins near 3,600 RPM.
How many kHz are in a MHz?
There are 1,000 kHz in 1 MHz. So 5 MHz equals 5,000 kHz, and 0.5 MHz equals 500 kHz.
Why is Wi-Fi measured in GHz but the difference is just MHz?
Wi-Fi bands like 2.4 GHz and 5 GHz name the center frequency, but each channel is only about 20 to 80 MHz wide. So the band number is in GHz while the channel width is conveniently described in MHz.
What is 33 RPM in Hz?
A 33⅓ RPM record spins at about 0.556 Hz (33.33 ÷ 60). That is far below the 20 Hz lower limit of human hearing, which is why turntable speed and audio frequency are unrelated.
Can I convert RPM directly to MHz?
Only by going through hertz first — RPM has no direct metric relationship to MHz. Divide RPM by 60 to get Hz, then divide by 1,000,000 to reach MHz; for example, 60,000,000 RPM equals 1 MHz.
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