basic

Photon Momentum from Wavelength Calculator

p = h / λ.

Compute the linear momentum of a photon directly from its wavelength using p = h / λ, with Planck's constant h = 6.62607015 × 10⁻³⁴ J·s. The same formula gives the de Broglie momentum of any photon. Reports the wavelength in metres and momentum in kg·m/s.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

nm

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

p = h / λ.

In depth

Compute the linear momentum of a photon directly from its wavelength using p = h / λ, with Planck's constant h = 6.62607015 × 10⁻³⁴ J·s. The same formula gives the de Broglie momentum of any photon. Reports the wavelength in metres and momentum in kg·m/s.