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Speed of Light / Frequency–Wavelength Calculator
Find the frequency or wavelength of light from the other one, using the speed of light in a vacuum as the link between them.
c = λ × f
Light in a vacuum always travels at the same speed, so a longer wavelength means a lower frequency and vice versa.
Frequency
— Hz
The calculation runs entirely in your browser — no data leaves your device. Change any number and the answer updates instantly.