Wavenumber Calculator

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Calculate wavenumber from wavelength.

Input

Wavelength (meters)

10 μm = 1e-5 m.

Wavenumber (ν̃)

Wavenumber (cm⁻¹)-cm⁻¹

Wavenumber SI (m⁻¹)-m⁻¹

About this calculator

Quick Reference

λWavelength

Overview

Wavenumber is the spatial frequency of a wave, often defined as 1/λ (spectroscopy) or 2π/λ (physics) angular wavenumber. This calculator computes the spectroscopic wavenumber.

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Pro Tips

In spectroscopy, wavenumber is typically measured in cm⁻¹.
High wavenumber corresponds to high energy and frequency.

Fun Facts

"Infrared spectroscopy uses wavenumbers (e.g., 4000-400 cm⁻¹) to identify molecular bonds."

Formula: ν̃ = 1 / λ