Photon Energy Unit Converter
Convert optical frequency, wavenumber, wavelength, and photon energy instantly. Edit any field; the rest update as you type.
Convert
cm⁻¹
μm
nm
THz
eV
meV
Enter a positive, finite value.
Relation
ν = cṽ λ = 1/ṽ E = hν
Spectrum visualizer
Move across the electromagnetic spectrum from terahertz frequencies to ultraviolet light.
- Wavenumber
- cm⁻¹
- Wavelength
- μm
- Photon energy
- eV
- Frequency
- THz
THzInfraredVisibleUV
Difference
Enter two wavenumbers to calculate their separation.
Separation100.0000cm⁻¹
Equivalent wavelength
100.0000μm
Equivalent wavelength
100000.0000nm
Wavelength difference|λA − λB|
391.0068nm
Energy interval
0.0124eV
Energy interval
12.3984meV
Frequency interval
2.9979THz
Note “Equivalent wavelength” is 1/Δṽ. It is not the wavelength spacing between the two lines; that quantity is shown separately as |λA − λB|.