Photon Energy Calculator

Calculate the energy of a photon in joules and electronvolts and its frequency in terahertz from the wavelength in nanometers

Frequently Asked Questions

How is photon energy related to wavelength?

Photon energy is inversely proportional to wavelength through the Planck-Einstein relation, so shorter wavelengths carry more energy. This is why ultraviolet light is more damaging than infrared light.

Why use electronvolts instead of joules?

Single-photon energies are extremely small in joules, so the numbers are awkward. Electronvolts give convenient values, typically a few electronvolts for visible light, which makes comparisons much easier.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.