Enter the wavelength into the calculator to determine the wavenumber. This calculator can also evaluate any of the variables given the others are known.

Cm To Wavenumber Formula

The following formula is used to calculate the wavenumber.

W = 1 / λ


  • W is the wavenumber (cm-1)
  • λ is the wavelength in centimeters (cm)

To calculate the wavenumber, take the reciprocal of the wavelength in centimeters. This means dividing 1 by the wavelength. The result is the wavenumber, measured in reciprocal centimeters (cm-1).

What is Cm To Wavenumber?

Cm to wavenumber is a conversion used in spectroscopy, which is the study of the interaction between matter and electromagnetic radiation. The wavenumber, often used in infrared spectroscopy, is the spatial frequency of a wave, measured in cycles per unit distance or radians per unit distance. It is typically measured in reciprocal centimeters (cm-1), hence the conversion from cm to wavenumber. The wavenumber is calculated as the reciprocal of the wavelength in centimeters (1/wavelength).

How to Calculate Cm To Wavenumber?

The following steps outline how to calculate the Cm To Wavenumber using the formula: W = 1 / λ

  1. First, determine the wavelength in centimeters (λ).
  2. Next, use the formula W = 1 / λ to calculate the wavenumber (W).
  3. Finally, calculate the Cm To Wavenumber.
  4. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

wavelength in centimeters (λ) = 5