Wavelength Calculator
Find the wavelength of a wave from its speed and frequency.
m/s
Hz
299.7925 cm
2,997,924,580 nm
Formula
Examples
| Input | Result |
|---|---|
| v = 299,792,458 m/s, f = 100 MHz | λ ≈ 2.998 m |
About this calculator
A wave’s wavelength (λ) is the distance between successive crests. It equals the wave speed divided by the frequency: λ = v / f. With speed in metres per second and frequency in hertz, the wavelength comes out in metres.
For electromagnetic waves such as light and radio in a vacuum, the speed is the speed of light, c ≈ 299,792,458 m/s, which is the default here. For sound, use the speed of sound in the medium instead (about 343 m/s in air at room temperature). Higher-frequency waves have shorter wavelengths, and vice versa.
Frequently asked questions
Wavelength equals wave speed divided by frequency: λ = v / f. Use m/s and hertz to get the wavelength in metres.
For light or radio waves in a vacuum, use the speed of light (≈ 299,792,458 m/s). For sound, use the speed of sound in your medium, such as ~343 m/s in air.
They are inversely proportional for a fixed wave speed: as frequency increases, wavelength decreases, and their product always equals the wave speed.
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