Science & Engineering

Sound Wavelength Calculator (Lambda = v / f)

A sound wave's length is the speed of sound divided by its frequency. Enter a frequency and the medium, and the air speed even adjusts for temperature.

How to use
  1. Enter the sound frequency in hertz.
  2. Pick the medium, or set the air temperature.
For study and estimation. Verify against authoritative data before relying on a result.
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Worked examples

FrequencyMediumSpeed (m/s)WavelengthNote
20 HzAir 20C34317.2 mLow bass
440 HzAir 20C3430.78 mConcert A
1000 HzAir 20C3430.343 mReference tone
1000 HzSeawater15001.5 mSonar range

Common questions

How do you find the wavelength of a sound?

Divide the speed of sound by the frequency. In 20C air at 343 m/s, a 440 Hz note has a wavelength of 343 / 440 = 0.78 m.

Does temperature change sound wavelength?

Yes. The speed of sound in air rises about 0.6 m/s per degree C, so warmer air gives a slightly longer wavelength for the same frequency.

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