Frequency Converter
Convert between Hertz, kilohertz, megahertz, gigahertz, and terahertz instantly.
Type in any field and the others update automatically.
Type in any field — the others update instantly.
Frequency counts how many times something repeats each second. The SI unit is the hertz (Hz): one hertz is one cycle per second. What makes frequency remarkable is its reach. The same unit describes a slow heartbeat, a musical note, a radio carrier, and a beam of light, spanning more than fifteen orders of magnitude.
Metric prefixes:
- 1 kHz = 1,000 Hz
- 1 MHz = 1,000,000 Hz
- 1 GHz = 1,000,000,000 Hz
- 1 THz = 1,000,000,000,000 Hz
Frequencies you can place:
- Human hearing: 20 Hz to 20 kHz
- FM radio: 88–108 MHz
- Wi-Fi (2.4 GHz band): 2,400 MHz
- Visible light: 430–770 THz
Frequency and period are two views of one thing. The period is one divided by the frequency, so a 100 Hz signal repeats every 0.01 seconds. If someone hands you a time per cycle and you need a rate, just flip it.
A frequent snag is angular frequency, written as omega and measured in radians per second. It runs through physics and signal processing and equals 2π times the frequency in hertz, so 50 Hz mains works out to about 314 rad/s. Both describe the same oscillation: one counts whole cycles, the other counts radians of phase. Check which one a formula expects before you plug numbers in.
How we build and check this converter
This converter runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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