Frequency / Wavelength / Energy Calculator

Enter a wavelength in microns (μm), frequency in gigahertz (GHz), or energy in electron volts (eV), then choose one of the calculate buttons. The related values will be filled in automatically.

Conversion inputs and outputs

Wavelength (λ)
μm

Frequency (f)
GHz

Energy (E)
eV

Light type

Calculate f and E Calculate λ and E Calculate λ and f

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This chart shows wavelength in meters and frequency in hertz. By looking on the chart you may convert from wavelength to frequency and frequency to wavelength.
Frequency and wavelength of light are related to one another through the speed at which light travels.

Equation: f * λ = c
Equation: E = ^hc/_λ

where:
f = frequency in Hertz (Hz = ¹/_sec)
λ = wavelength in meters (m)
c = the speed of light (299792458 ^m/_s)
E = energy in electron Volts (eV)
h = Plank's constant (6.626068 ◊ 10^{-34 m2kg}/_s)

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