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PHYSICS / WAVES

Doppler Effect Calculator

Estimate observed frequency for collinear source and observer motion in a stationary medium. Inspect the governing equation, substituted SI values, output, and model boundaries in one guided workspace.

  • 01 Calculated in this tab
  • 02 Values stay in this browser tab
  • 03 Use boundary

Conversion input

Known value

Filter by unit name, symbol, or code. Your current selections remain available.

Preparing the calculator...

Use boundary

Calculation path

Estimate observed frequency for collinear source and observer motion in a stationary medium. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.

Calculation path

f' = f(v+v_o)/(v-v_s)

What you provide

What you provide

  • Emitted frequency expressed in Hz, using the same scenario as the other inputs
  • Wave speed expressed in m/s, using the same scenario as the other inputs
  • Observer velocity toward source expressed in m/s, using the same scenario as the other inputs
  • Source velocity toward observer expressed in m/s, using the same scenario as the other inputs

What you receive

What you receive

  • Observed frequency in Hz from the stated equation
  • A symbolic formula plus substituted working with your values
  • Visible assumptions, field guidance, and an authoritative learning reference

Use boundary

Choose the maximum decimal places shown. This does not increase source accuracy.

Positive source and observer velocities use the stated toward-each-other sign convention; relativistic effects are excluded.

Use internally consistent units and retain extra precision when carrying the result into another calculation.

Reviewed reference factors

Reviewed reference factors