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Free Physics Calculator

Wavelength Calculator

λ = v / f

Calculate wavelength, frequency, or wave speed for any wave type — light, sound, radio, or custom.

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〰️ Wavelength Calculator

Enter any TWO values — the third will be calculated automatically.

Enter any two values above
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The Wave Equation

All waves obey: v = fλ — wave speed = frequency × wavelength. Rearranging:

  • λ = v/f – find wavelength
  • f = v/λ – find frequency
  • v = fλ – find wave speed

EM Spectrum Wavelengths

All electromagnetic waves travel at c = 3×10⁸ m/s in vacuum:

TypeWavelengthFrequency
Radio& gt;1 mm<300 GHz
Visible380–700 nm430–790 THz
X-ray0.01–10 nm30 PHz–30 EHz
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