Motor Efficiency Calculator

Calculate motor operating efficiency, power input, losses, and annual energy cost at any load level.

Rated horsepower.
HP
Actual load as percentage of rated.
%
Nameplate efficiency. IE3: 93-96%, IE2: 91-95%.
%
Motor PF. Varies with load: 0.65@25% to 0.87@100%.
Cost per kilowatt-hour.
$/kWh
Hours per year. 24/7: 8760, 2-shift: 4000.
h/yr

Results

Mechanical Output-kW
Electrical Input-kW
Total Losses-kW
Operating Efficiency-%
Annual Energy Cost-$
References: NEMA MG-1; IEEE 112; NEC Article 430