Photon Calculator (Wavelength, Frequency, Energy)

Convert between wavelength (λ), frequency (f), and photon energy (E). Uses c = λf and E = hf.

Choose what to calculate, then fill the other field.
Example: 500 nm = 5e-7 m.
Example: visible light is ~4e14–7.5e14 Hz.
J·s (default is exact SI value).
m/s (exact in vacuum).
c = λ·f
E = h·f
1 eV = 1.602176634e−19 J
Photon energy shown in J and eV.