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Planck- Units || Length | Time | Mass | Temperature | Charge || Area | Volume | Energy || Photons

# Calculator for Mass, Energy and Momentum of Photons

## Calculates the mass, energy and momentum of a single photon or a number of photons from the wavelength.

The rest mass of a photon is 0. But photons travel at the speed of light. The mass of a photon is calculated with the formula m=ℎ/(c*λ) with Planck's constant ℎ, the speed of light c in meters per second and the wavelength λ in meters. Einstein's equation E=mc² applies to energy. Finally, the momentum is the mass times the speed of light, p=mc.

Please enter the wavelength and the number of photons. The default for number of photons is 1*10^{0}, i.e. 1.

Example: a photon in green light has a wavelength of 530*10^{-9} meters. This means it has a mass of around 4.17*10^{-36} kilograms.

For wavelengths see the spectrum calculator.

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