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Photon Wavelength and Energy Calculator
Calculate vacuum wavelength and single-photon energy from a frequency.
Your result
EVERYDAYEnter your values and select calculate.
On this page How it works & practical examples
How to use the Photon Wavelength and Energy Calculator
Frequency is entered in terahertz and converted to hertz. The model uses exact SI values c = 299,792,458 m/s and h = 6.62607015×10⁻³⁴ J·s.
The calculation
Vacuum wavelength = c/f; single-photon energy = h f
Worked example
500 THz corresponds to about 599.5849 nm vacuum wavelength and 2.0678 eV per photon.
Assumptions and limits
Vacuum wavelength only; wavelength in a medium depends on refractive index. Photon energy is not total beam power or exposure dose.
Common questions
Which inputs should I use?
Frequency is entered in terahertz and converted to hertz. The model uses exact SI values c = 299,792,458 m/s and h = 6.62607015×10⁻³⁴ J·s.
What does the result exclude?
Vacuum wavelength only; wavelength in a medium depends on refractive index. Photon energy is not total beam power or exposure dose.