Wavenumber Calculator

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Choose which quantity to calculate. "Wavenumber" means enter a wavelength; "Wavelength" means enter a wavenumber.
The wavelength of the wave. Change the unit to nanometres, micrometres, angstroms, etc.
Spectroscopic wavenumberVisible light (Green)
20,000cm⁻¹

Number of wave cycles per centimetre - standard IR/Raman unit

Angular wavenumber12,566,370.6144rad m⁻¹
Wavelength500nm
Frequency599.5849THz
Photon energy2.479684eV
Photon energy0J
EM spectrum regionVisible light (Green)
20,000 cm⁻¹
Far IR / Microwave<10Mid IR (4000-10 cm-1)10-4000Near IR4000-14000Visible14000-25000UV25000+

20000.0 cm-1 - Visible light (Green)

  • The spectroscopic wavenumber is 20000.0 cm-1, meaning 20000 complete wave cycles fit inside one centimetre.
  • Each photon at this wavelength carries 2.4797 eV of energy, or 3.973e-19 J.
  • The corresponding frequency is 599.585 THz (5.996e+14 Hz).
  • The angular wavenumber k = 2π/λ = 1.2566e+7 rad/m.

Next stepThis is in the visible range (500 nm). Human vision spans roughly 380 to 700 nm, peaking near 555 nm (green).

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