How does the Doppler Effect Calculator work?

Observed frequency: f_obs = f_source × (v + v_observer) / (v + v_source) Then: v = speed of sound (~343 m/s in air at 20°C) Then: v_source positive = moving away from observer; negative = moving toward Then: Redshift in astronomy: distant galaxies' light shifts to lower frequencies as they recede.

Can you give an example of how to use the Doppler Effect Calculator?

Example: Input Ambulance siren 700Hz · speed 30 m/s approaching gives a result of Observed frequency ≈ 765Hz (700 × 343/(343−30) = 700 × 1.096 = 767).

Is the Doppler Effect Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Doppler Effect Calculator?

Our Doppler Effect Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Doppler Effect Calculator

Source frequency (Hz)

Source velocity (m/s)

Observer velocity (m/s)

The Doppler effect is the change in frequency (pitch) of a wave when the source or observer is moving relative to the medium. A sound source moving toward you has a higher apparent frequency; moving away has lower frequency. Used in radar, medical ultrasound, and astronomy.

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Did You Know?

Christian Doppler first described this effect in 1842 for light waves in binary stars. A Viennese railway company tested it two years later by having musicians play on a moving train.

References

›Doppler effect — Wikipedia

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