Estimate motor amps from horsepower, kilowatts, voltage, phase type, efficiency, power factor, and service factor. This calculator also estimates full-load amps, adjusted amps, starting amps, kVA, watts, breaker planning size, and fuse planning size.
Motor power:
The calculator converts horsepower to watts, or uses entered kW, watts, or nameplate amps.
Motor current:
It estimates current using voltage, phase type, efficiency, and power factor.
Planning values:
It estimates adjusted amps, starting amps, breaker planning size, fuse planning size, kVA, and comparison motor amps.
A motor amp calculator helps estimate the current a motor may draw so you can plan circuits, panels, breakers, fuses, wire size, and equipment loads.
It can help with pumps, fans, compressors, shop tools, conveyors, HVAC equipment, and general motor load planning.
Your result shows full-load amps, adjusted amps, starting amps, motor watts, input watts, kW, kVA, horsepower, voltage, efficiency, power factor, service factor, breaker planning size, and fuse planning size.
Convert horsepower to watts, then divide by voltage, efficiency, and power factor. For three-phase motors, also divide by √3.
Motors often draw high inrush current when starting because the rotor is not yet moving and back EMF is low.
For real installations, use the motor nameplate and applicable electrical code. Calculated amps are useful for early planning only.
No. This calculator gives planning estimates. Final motor conductor, breaker, fuse, overload, disconnect, and starter sizing must follow code and manufacturer instructions.