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`p = h/lambda`

Enter a value for all fields

The **Momentum of a Photon** calculator computes the momentum of a photon based on the wavelength and Plank's constant where:

**INSTRUCTIONS:** Choose units and enter the following:

**(h)**Planck's constant**(**`lambda`**)**Wavelength of photon

**Momentum(p):** The equation returns momentum(p) in kg*m/s.

The **Momentum of a photon** is found using the following formula:

p=h/λ

where:

- p = Momentum of a photon
- h = Plank's constant
- λ = wavelength

34.2 How much light is one photon by Benjamin Crowell, Light and Matter licensed under the Creative Commons Attribution-ShareAlike license.