Spectral Unit Converter

Enter wavelength, frequency, wavenumber, or photon energy — get all equivalent values instantly.

Input
Visible (Red)
632.8 nm
Wavelength
Nanometres
632.8nm
Micrometres
0.63280µm
Ångströms
6328.0Å
Frequency
Terahertz
473.8THz
Gigahertz
473755.5GHz
Hertz
4.7376e+14Hz
Wavenumber
Spectroscopic
ν̃ = 1/λ — proportional to energy
15802.8cm⁻¹
Angular
k = 2π/λ — used in wave equations
9.9292e+6rad/m
Photon Energy
Electron volts
1.9593eV
Joules
3.1391e-19J
Abridged Optics — Spectral Unit Converter v1.0Constants: 2019 SI redefinition (c, h, e exact)

All information, equations, and calculations have been compiled and verified to the best of our ability. For mission-critical applications, we recommend independent verification of all values. If you find an error, please let us know.