basic

Electric Motor Efficiency from Input and Output Power Calculator

η = P_out/P_in — useful power fraction for motors.

Calculates motor efficiency η = P_output / P_input, losses = P_in − P_out, and input current at a given voltage. Typical motor efficiency: 85–97%.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

W
W
V

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

η = P_out / P_in; I = P_in / V

In depth

Calculates motor efficiency η = P_output / P_input, losses = P_in − P_out, and input current at a given voltage. Typical motor efficiency: 85–97%.