Wavelength to Wavenumber Conversion Calculator

This is an online calculator that calculates Wavenumber in cm-1. Just enter the Wavelength value to get the corresponding Wavenumber value.
Enter the Wavelength to Calculate the Wavenumber Value
  • nm

Result

  • Wavenumber in cm-1
    cm-1

Wavenumber is defined as the number of waves per unit distance. It is the inverse of the wavelength. Wavelength is the distance between two consecutive points in a wave which are in same phase.

Consider wavelength in nm,

Now to convert m-1 to cm-1, 

We’ve,

So (1) can be written as,