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Doppler Effect Calculator

Variable Legend

f₀= observed frequencyfₛ= source frequencyv= wave speed (e.g. 343 m/s for sound in air)v_O= observer velocity (+ toward source)v_S= source velocity (+ away from observer)

Doppler formula

General form for moving source and observer.

Source moving toward observer

v_O = 0, source approaching (v_S positive).

Source moving away from observer

Observer moving toward source

v_S = 0, observer approaching.

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Pro Tip

Always verify your input values before calculating. For doppler effect, small input errors can compound and significantly affect the final result.

Difficulty:Intermediate

Did you know?

Doppler Effect Calculator becomes much more intuitive once you see the same rule applied to several realistic examples instead of a single abstract formula.

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Reviewed May 2026
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