How to use the Wavelength Calculator
- Choose a general wave, light, or photon energy.
- Pick what to solve for.
- Enter the values and read the wavelength.
What does this tool do?
Wavelength is the distance between repeating points of a wave. It's linked to speed and frequency by λ = v ÷ f. A 440 Hz note in air (343 m/s) has a wavelength of about 78 cm.
For light, the speed is c, about 300,000 km/s. Green light at 545 THz has a wavelength near 550 nm. A photon's wavelength also follows from its energy: λ (nm) ≈ 1240 ÷ E (eV).
Why use it?
- Sound, light and photon modes.
- Nanometres and photon energy shown.
- Solve for any variable.
The formula
λ = v ÷ f
λ = c ÷ f
λ (nm) = 1239.84 ÷ E (eV)
Privacy
The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved. There's no account to create and nothing to install.
Last reviewed by the M2Toolkit team.