This calculator finds the energy of a single photon from its frequency using the Planck relation. The Planck constant is filled in automatically; enter the frequency to get the photon's energy.
What the symbols mean
- E — photon energy (joules).
- h — Planck constant, 6.626×10⁻³⁴ J·s (auto-filled).
- ν (entered as
nu) — frequency of the light (hertz).
Worked example
Green light at about 5.5×10¹⁴ Hz has a photon energy of roughly 3.6×10⁻¹⁹ J, or about 2.3 electronvolts.