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`\lambda = \frac{h c}{E}`

Enter a value for all fields

The **Photon Wavelength from Energy** calculator compute the wavelength ( λ) of a photon based on Planck's constant (h), the speed of light (c) and the energy of the photon ( E).

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

- (
**E**) This is the energy of the photon

**Wavelength of Photon (λ):** The calculator returns the wavelength in meters. However, this can be automatically converted to compatible units via the pull-down menu.

The energy of a photon depends only on its wavelength. The formula for the wavelength of a photon is:

where:

- λ= wavelength of the photon
- E = energy of the photon
- h = Planck's constant
- c = speed of light ( 2.998 × 10
^{8}m/s)