basic

Electric Motor Output Efficiency Calculator

η = P_out / P_in × 100 — motor mechanical efficiency.

Calculates electric motor output shaft power, efficiency, and heat losses from input voltage, current, power factor, and rated shaft power.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

P_in = V × I × pf; η = P_shaft / P_in × 100

In depth

Calculates electric motor output shaft power, efficiency, and heat losses from input voltage, current, power factor, and rated shaft power.