Doppler Effect Calculator (Sound)

Estimate the observed frequency when a sound source and/or observer is moving (1D, along the line of sight).

Example: A4 note is 440 Hz.
343 m/s ≈ air at 20°C.
Positive = moving toward the source.
Positive = moving toward the observer.
Quick test to verify buttons work.
f’ = f · (v + vₒ) / (v − vₛ)
+vₒ = observer moves toward source
+vₛ = source moves toward observer
Valid for sound when speeds are well below v.