Wavelength, frequency and photon energy
Convert frequency and wavelength (light, radio, sound) and find the photon energy.
How it works
λ = v / f with v = c = 299,792,458 m/s for light. Photon energy E = h × f (h = 6.626 × 10⁻³⁴ J·s), in electronvolts: E / 1.602 × 10⁻¹⁹.
Results are for guidance only and do not replace professional advice.
Worked example
With the default values:
- Value550
- UnitWavelength (nm)
- WaveElectromagnetic (light, radio)
you get:
- Wavelength550 nm
- Frequency545.0772 THz
- BandVisible light (green)
- Photon energy2.254258 eV (3.612 × 10^-19 J)
Frequently asked questions
How does the “Wavelength, frequency and photon energy” tool work?
λ = v / f with v = c = 299,792,458 m/s for light. Photon energy E = h × f (h = 6.626 × 10⁻³⁴ J·s), in electronvolts: E / 1.602 × 10⁻¹⁹.
What do I need to enter?
Just fill in: value, unit, wave. The result updates as you type.
Can you give an example?
Value: 550; Unit: Wavelength (nm); Wave: Electromagnetic (light, radio) → Wavelength: 550 nm; Frequency: 545.0772 THz.
Is this calculator free, and is my data private?
Yes. HOD Calc is completely free with no sign-up. The calculation runs in your browser: nothing you type is sent or stored.