Convert between electromagnetic frequency and wavelength in free space.
Formula
f = c / λ, with c ≈ 299,792,458 m/s (speed of light in vacuum)
Explanation
In vacuum, wave speed equals the speed of light c. Frequency and wavelength are inversely related: higher frequency means shorter wavelength. Rearrange to λ = c/f when frequency is known.
Variables
ffrequency (Hz)
λwavelength (m)
cspeed of light in vacuum
When to use
RF, optics, photonics, and estimating band from wavelength or the reverse.