Doppler Effect Calculator

Find the observed frequency from relative motion.

Source frequency (Hz)

Speed of sound

Observer speed (toward +)

Source speed (toward +)

Observed frequency (Hz) 1,095.85

Formula: f' = f × (v + v_obs) ÷ (v − v_src)

Step-by-step with your numbers:

1. Values used:

2. Source frequency = 1,000 Hz

3. Speed of sound = 343

4. Observer speed (toward +) = 0

5. Source speed (toward +) = 30

7. Observed frequency = 1,095.85Hz

Did we solve your problem today?

The Doppler effect shifts pitch up as a source approaches and down as it recedes.

The math behind it

f' = f × (v + observer speed) ÷ (v − source speed). Speeds are positive when moving toward each other.

1000 Hz source at 30 m/s → ~1096 Hz approaching.

Receding?

Use a negative source speed; the pitch drops.