ONE FORMULA, ONE ANSWER
Acoustic Doppler Frequency Calculator
Calculate classical one-dimensional acoustic Doppler frequency. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Observed frequency f_obs
Enter values and select Calculate.
f_obs = f₀(c_s+v_o)/(c_s−v_s)
Assumptions
Required: positive f₀,c_s and subsonic speed magnitudes relative to the medium. Observer motion toward the source and source motion toward the observer are positive. Shocks, reflections and relativistic electromagnetic Doppler are excluded.
Displayed values are floating-point approximations. Design safety factors and unprovided error contributions are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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