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How to use this calculator
Choose the formula (if there is more than one), choose what you want to find, then fill in the other values using the units shown. The calculator rearranges the formula, puts your numbers in, and shows every step.
How it's calculated
Wave speed v = fλ, where f is frequency and λ is wavelength. Frequency f = 1 / T, where T is the period.
Worked example
A wave with frequency 50 Hz and wavelength 2 m has speed 50 × 2 = 100 m/s.
Frequently asked questions
What is a hertz?
One wave per second.
What is the period?
The time for one complete wave, in seconds.
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Last updated October 2026. Results are for learning and guidance; always check important work. Calculations run in your browser and are not stored.