Science CalculatorsPrivate by design
Photon Energy Calculator
Enter a wavelength to calculate the energy of a single photon of light at that wavelength.
How to use this tool
- 1Enter the wavelength in nanometers.
- 2See the photon's energy in joules and electron volts.
Frequently asked questions
Why do shorter wavelengths have more energy?+
Photon energy is inversely proportional to wavelength (E = hc/λ) — that's why high-energy radiation like X-rays and gamma rays has much shorter wavelengths than visible light or radio waves.
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