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Frequency Converter
Convert frequency between hertz, kilohertz, megahertz and more, with wavelength display.
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How to Use This Converter
Type a value in either box and pick the units. The other box updates instantly. Use the swap button to reverse the direction.
- All 7 units are supported in both directions.
- Results update live as you type — no button to press.
- Values are formatted for readability while staying precise.
Frequently Asked Questions
How do I convert RPM to hertz?
Divide by 60. 60 RPM = 1 revolution per second = 1 Hz.
What is the wavelength of a frequency?
The distance a wave travels in one cycle: λ = c/f, where c is the speed of light (299,792,458 m/s).
What is the range of human hearing?
Roughly 20 Hz to 20 kHz. Frequencies above that are ultrasound.
How do I convert MHz to Hz?
Multiply by 1,000,000. FM radio around 100 MHz is 100 million Hz.
Practical Example
Convert an FM radio signal of 98.7 MHz to hertz: 98.7 × 1,000,000 = 98,700,000 Hz. You can also find its wavelength with λ = c ÷ f.
- Wavelength = 299,792,458 ÷ 98,700,000 ≈ 3.04 meters
- 98.7 MHz ÷ 1,000 = 98,700 kHz
- Formula: Hz = MHz × 1,000,000
What Your Results Mean
- Hertz (Hz) — cycles per second, the SI unit of frequency.
- kHz / MHz / GHz — multiples of 1,000; used for audio, radio and wireless bands.
- RPM / BPM — revolutions or beats per minute; 60 RPM = 1 Hz.
- Wavelength — the distance a wave covers in one cycle: λ = c/f.
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