# RF Wireless World

## Home of RF and Wireless Vendors and Resources

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## Photon Energy Calculator | Photon Energy Formula

This page covers Photon Energy Calculator. It mentions Photon Energy formula or equation. The photon energy calculator calculates photon energy based on wavelength or frequency as input.

### Photon energy Calculator #1 using wavelength

Following calculator calculates photon energy based on light wavelength.

Light wavelength, µm (Input) :

Photon Energy, Joule (Output):

Example Photon Energy calculator#1:
INPUTS : Light wavelength = 0.5 µm
OUTPUTS: Photon Energy = 3.97566 e-19 Joule

### Photon Energy formula or equation

Following formula or equation is used for photon energy calculator#1. This calculator calculates photon energy based on walelength of the light source. This is known as Planck's equation. ### Photon energy Calculator #2 using frequency

Following calculator#2 calculates photon energy based on light frequency.

Light frequency, GHz (Input) :

Photon Energy, Joule (Output):

Example Photon Energy calculator#2:
INPUTS : Light wavelength = 300 GHz
OUTPUTS: Photon Energy = 1.98 x 10-22 Joule

If light source power is given as P (in Watts) and each photon energy is E in joules, number of photons (N) emitted per second can be calculated using following equation.
➨ N = P in Watts/E in Joules
Example: If P is 1 Watts and Energy of each photon is 4 x 10-19 , then number of emitted photons in one second is equal to 2.5 x 108.

### Useful converters and calculators

Following is the list of useful converters and calculators.

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