Frequency Converter
Convert between Hz, kHz, MHz, GHz and rpm.
Results update as you type.
How it works
A frequency converter restates how often something repeats per unit of time in a different unit, moving between hertz, kilohertz, megahertz and gigahertz, and also to and from revolutions per minute. It reduces your figure to hertz, the SI unit for frequency of one cycle per second, then scales out to the unit you choose, so one mechanism covers radio bands, processor clock speeds, audio, and rotating machinery alike. This matters because frequency spans an enormous range and each domain settles on its own convenient unit. Audio and mains power sit in the tens to thousands of hertz; radio and Wi-Fi live in megahertz and gigahertz; computer processors are quoted in gigahertz; engines, turbines and motors are measured in revolutions per minute. Comparing a motor's rpm against a vibration limit in hertz, or lining up a radio frequency quoted in megahertz against one in gigahertz, is only possible once everything shares a single unit. The convert-through-hertz method is used because every frequency unit is a fixed multiple of the hertz — one kilohertz is 1,000 Hz, one gigahertz is a billion Hz, and one rpm is one cycle per sixty seconds or 1/60 Hz — so pivoting through that base stays exact and needs only one factor per unit. Engineers, radio and audio technicians, IT professionals and machinery operators all use a frequency converter whenever a rate arrives in an unfamiliar unit.
Convert to hertz via known factors, then to the target unit
The input is multiplied by its unit's fixed number of hertz to express the frequency in hertz, then divided by the target unit's hertz value to complete the conversion. Because each metric frequency prefix is an exact power of ten and one rpm is exactly one-sixtieth of a hertz, every unit has a fixed ratio to the hertz, so chaining through that single base is exact for every pairing with just one stored factor per unit.
Source:International System of Units (SI) — NIST
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter value, from and to.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Converted frequency updates instantly as you type — no button to press.
Frequently asked questions
How do I convert MHz to GHz?
Divide the megahertz figure by 1,000 to get gigahertz, since a gigahertz is 1,000 megahertz. So a 2,400 MHz Wi-Fi channel is 2.4 GHz, and a 3,600 MHz memory module is 3.6 GHz. To reverse it, multiply gigahertz by 1,000. Both units are exact powers of ten above the hertz, so the conversion is simply a shift of the decimal point by three places.
How do I convert rpm to hertz?
Divide revolutions per minute by 60 to get hertz, because one revolution per minute is one cycle spread across sixty seconds. So a motor at 3,000 rpm turns at 50 Hz, and 1,800 rpm is 30 Hz. To reverse it, multiply hertz by 60. This link is useful for matching rotating machinery speed to electrical supply frequency or to vibration limits quoted in hertz.
What is hertz a measure of?
Hertz measures frequency, the number of complete cycles or events that occur each second, named after physicist Heinrich Hertz. One hertz is one cycle per second. It applies to any repeating phenomenon — a sound wave's pitch, an alternating current's rate, a radio carrier, or a processor's clock ticks — which is why the same unit spans audio, power, radio and computing.
Is a higher-GHz processor always faster?
Not necessarily. Clock frequency in gigahertz tells you how many cycles the processor runs per second, but real-world speed also depends on how much work each cycle does, the number of cores, cache size and architecture. A newer 3.0 GHz chip can outperform an older 4.0 GHz one. Frequency is one important factor among several, not a complete measure of performance on its own.
Why convert frequency through hertz?
The hertz is the SI unit for frequency, one cycle per second, so every other frequency unit has a fixed, exactly defined ratio to it. Using it as the pivot means the converter needs only one factor per unit rather than a separate rule for each pair, keeps results exact, and matches the unit that physics and signal-processing equations use, making cross-checks straightforward.