About this tool
Find the frequency heard when the source or the listener is moving.
f′ = f·(c + v_o) ÷ (c − v_s). Speeds are positive when moving toward each other and negative when moving apart.
Formula: f′ = f(c + v_o)/(c − v_s)
Example: Source frequency (Hz) = 440, Wave speed (m/s) = 343, Listener speed toward source (m/s) = 0, Source speed toward listener (m/s) = 30 → Observed frequency (Hz) = 482.173, Frequency shift (Hz) = 42.173.
For sound in still air; the speed of sound is about 343 m/s at 20 °C.
Quick steps
- Enter your values — every field shows its unit.
- Press Calculate (or Try an example to see how it works).
- Read the results and copy them if you need them elsewhere.
The calculation runs in your browser. Nothing you type is sent to 1CLIK.
FAQ
How does the Doppler Effect Calculator work?
f′ = f·(c + v_o) ÷ (c − v_s). Speeds are positive when moving toward each other and negative when moving apart.
What should I keep in mind?
For sound in still air; the speed of sound is about 343 m/s at 20 °C.
Is my data sent anywhere?
No. The numbers stay on your device; the page only shows the result.