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Doppler Effect Calculator
Find the pitch a listener hears from a moving sound source as it approaches them or moves away from them in the air at a steady speed.
f′ = f × v ÷ (v − v_s)
A source moving toward you squeezes the waves together and raises the pitch; moving away stretches them and lowers it.
Observed frequency
… Hz
The calculation runs entirely in your browser, no data leaves your device. Change any number and the answer updates instantly.