Frequency ↔ Wavelength Converter — Free Online Tool

Convert between frequency (Hz, kHz, MHz, GHz) and electromagnetic wavelength using λ = c/f with the exact speed of light.. Frequency ↔ Wavelength Converter is a free online tool from the ToolsRift Special Unit Converters collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.

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How to use Frequency ↔ Wavelength Converter

Enter a frequency in Hz or a wavelength in metres. The tool applies λ = c/f both ways and lists kHz, MHz, GHz, cm and mm values.

Frequently asked questions

What formula converts frequency to wavelength?

λ = c ÷ f, where c is 299,792,458 m/s, the exact speed of light in vacuum.

What wavelength is 100 MHz?

100 MHz gives λ = c/f ≈ 2.9979 m, a typical FM-radio wavelength.

Does this assume a vacuum?

Yes — it uses the vacuum speed of light; in other media, wavelength shrinks by the refractive index.

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