Audio & acoustics

Frequency to wavelength calculator

Convert frequency and wavelength directly using the speed of sound and optional temperature input.

Updated on Apr 24, 2026 Calculator, calculation path and examples on one page

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Calculator

Calculation direction

Frequency in Hz

Wavelength in meters

Air temperature in degrees C

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Result

This way you can see directly how long an acoustic wave is at the selected frequency.

wavelength 3,433 m

Frequency: 100.00Hz
Quarter wavelength: 0.858 m
Speed of sound: 343.30 m/s

The calculation applies to sound in air. The wavelength also changes slightly with temperature.

Examples

Typical calculations

Low frequency wavelength at 20 degrees C.

100 Hz in space

wavelength: 3,433 m

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Wavelength for a typical center frequency.

1kHz

wavelength: 0.343 m

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Derive frequency again from wavelength.

Calculate back 2.5 meters

Frequency: 137.32Hz

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FAQ

Frequently asked questions

What does wavelength mean in audio practice?

It shows how long a complete oscillation cycle is in air. This is helpful, for example, when setting up and room sizes.

Why is the quarter wavelength important?

It often serves as a quick guide for distances, resonances and absorber dimensions.

What wavelength is 100 Hz?

At 20 degrees C it is around 3.43 meters.

Does wavelength change with temperature?

Yes. As the speed of sound changes, the wavelength also changes.

Does the calculator apply to air or to speaker enclosures?

The calculator refers to sound in air. Other media require different speeds of sound.

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Sources and notes

Rule status and context

Formulas: Lambda = c / f, f = c / lambda, c = 331.3 + 0.6 x temperature
Note: The information is intended for sound propagation in air.