What is the Doppler effect?

The Doppler effect is the change in frequency of a wave as the source and observer move relative to each other. When moving closer, frequency increases; when moving apart, frequency decreases.

What is the speed of sound used in this calculator?

By default, this calculator uses 343 m/s, which is the speed of sound in dry air at 20°C (68°F). You can change this value for other media.

What is beat frequency?

Beat frequency is the difference between two frequencies heard simultaneously. It equals |f1 - f2| and is perceived as a periodic fluctuation in loudness.

Doppler Effect Calculator

Calculate the observed frequency and wavelength when source or observer is in motion, and compute beat frequency between two waves.

Doppler Frequency

Source Frequency (Hz)

Wave Speed (m/s)

Source Speed (m/s)positive = toward observer

Observer Speed (m/s)positive = toward source

Observed Frequency

440 Hz

f′ = f × (v + v_o) / (v − v_s)

Observed Wavelength

0.7795454545 m

λ′ = (v − v_s) / f

Beat Frequency

Frequency 1 (Hz)

Frequency 2 (Hz)

Beat Frequency

4 Hz

f_beat = |f₁ − f₂|

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Added Oct 9, 2026

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