How to convert wavenumber and wavelength

It depends on whether it's for general physics or for chemistry/spectroscopy:
For chemistry/spectroscopy: while for general physics:
For:
Insert wavelength or wavenumber and press calculate to obtain the other one:
Wavelength:
Wavenumber:
For:
Insert wavelength or wavenumber and press calculate to obtain the other one:
Wavelength:
Wavenumber:
The units will be the inverse of wavenumber, for example, if your units for wavenumber is nm-1, the units for wavelength is nm.

Other Conversions

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