Frequency of Light Calculator

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Choose which quantity you want the calculator to find.
Wavelength of the light in vacuum. The default 550 nm is green visible light.
FrequencyVisible light
545.1 THz

Frequency of the photon in human-readable units (Hz to PHz)

Wavelength550.0 nm
Energy per photon2.2543eV
Energy per photon3.6117e-19 J
EM spectrum regionVisible light
Visible colorYellow-green / Yellow
Wavenumber18182 cm⁻¹
Wavelength in Angstroms5500.0 A
2.2543 eV
Radio / Microwave<0.00124Infrared0.00124-1.65Visible light1.65-3.26UV / X-ray3.26+

Frequency: 545.1 THz, Wavelength: 550.0 nm (Visible light)

  • This is yellow-green / yellow light. Human eyes perceive the visible spectrum from about 380 nm (violet) to 780 nm (red).
  • At 2.254 eV per photon, this falls in the visible range (roughly 1.65 eV for red to 3.26 eV for violet).
  • The relationship c = λν always holds in vacuum: multiply wavelength (550.0 nm) by frequency (545.1 THz) and you get the speed of light, 299,792,458 m/s.

Next stepFor photon counting applications, divide the beam power in watts by the photon energy in joules to get photons per second.

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