Frequency Converter
Convert frequency between Hz, kHz, MHz, GHz, RPM and rad/s.
Results update as you type.
About this calculator
A frequency converter changes a rate of repetition between hertz, kilohertz, megahertz and gigahertz, plus revolutions per minute and radians per second. Values convert through the hertz — one cycle per second — as a common base.
The SI steps are simple powers of a thousand: 1 kHz = 1,000 Hz, 1 MHz = 1,000,000 Hz and 1 GHz = 1,000,000,000 Hz. The two odd ones out are RPM, which is cycles per minute (divide by 60 to reach hertz), and radians per second, which is 2π times the frequency in hertz.
Worked example: to convert 3,000 RPM to hertz, divide by 60, giving 50 Hz. To express a 2.4 GHz Wi-Fi signal in hertz, that is 2,400,000,000 cycles per second. A results table shows the same frequency in every unit at once, useful for radio, audio and rotating machinery.
Frequently asked questions
How many Hz are in a MHz?
One megahertz is 1,000,000 hertz, and one gigahertz is 1,000 megahertz. A 2.4 GHz Wi-Fi signal cycles 2.4 billion times per second.
How do I convert RPM to Hz?
Divide RPM by 60, since hertz is cycles per second. A motor at 3,000 RPM turns at 50 Hz.
What is radians per second?
Angular frequency in rad/s equals 2π times the frequency in hertz. So 1 Hz is about 6.2832 rad/s.
How many megahertz are in a gigahertz?
One gigahertz is 1,000 megahertz, or one billion hertz. A 3.2 GHz processor clock therefore ticks 3.2 billion times each second.
How do I convert Hz to RPM in this frequency converter?
This frequency converter multiplies hertz by 60 to reach revolutions per minute, since RPM counts cycles per minute. So 50 Hz corresponds to 3,000 RPM.
How do I convert kHz to MHz?
One megahertz is 1,000 kilohertz, so divide kilohertz by 1,000 to get megahertz. A 1,500 kHz AM radio station broadcasts at 1.5 MHz.
API — use this calculator from code
Call this calculator as a free JSON endpoint — no key required. Send the field values below as query parameters or JSON. Read the full API docs →
Endpoint
GET https://calculator.free/api/v1/frequency/curl
curl "https://calculator.free/api/v1/frequency/?amount=1&from=mhz&to=ghz"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/frequency/?" + new URLSearchParams({
"amount": "1",
"from": "mhz",
"to": "ghz"
}));
const data = await r.json();
console.log(data.results);Results are estimates for general guidance only, not financial, medical or tax advice.