Free Doppler Effect Calculator
Calculate the observed frequency when a sound source and observer are in relative motion using the Doppler formula.
Hz
m/s
m/s
m/s
Observed Frequency
482.17 Hz
Frequency Shift42.17 Hz
Observed Frequency vs Source Frequency
Doppler Effect
The Doppler effect is the change in observed frequency caused by relative motion between source and observer.
Formula
f_obs = f_source * (v_sound + v_observer) / (v_sound - v_source)
Sign convention: speeds are positive when source and observer move toward each other.
Example Calculation
An ambulance siren at 440 Hz approaches a stationary observer at 30 m/s.
- 01f_obs = f_s * (v + v_o) / (v - v_s)
- 02f_obs = 440 * (343 + 0) / (343 - 30)
- 03f_obs = 440 * 343 / 313
- 04f_obs = 482.2 Hz
Frequently Asked Questions
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