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Electric Motor Calculator

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The calculators below can be used to calculate electric motor amps, horsepower and 3-phase kVa.

Calculate Current (amps)


Calculate Power (horsepower)


Calculate 3 Phase Apparent Power (kVA)


  • RLA - "Running Load Amps" - current drawn during normal operation of electric motor.
  • FLA - "Full Load Amps" - amount of current drawn when full-load torque and horsepower is reached for the motor. FLA is usually determined in laboratory tests. Note! - in the calculator above FLA is RLA + 25%.
  • 1 hp = 0.745 kW

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Related Topics

• Electrical

Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors.

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Real, imaginary and apparent power in AC circuits.

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Electrical motors horsepower rating vs. their ampere rating.

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Electrotechnical Abbreviations

Abbreviations according the International Electrotechnical Commission (IEC).

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Amount of heat transferred from electrical motor to ambient room vs. locations of fan and motor.

NEMA - National Electrical Manufacturers Association

National Electrical Manufacturers Association.

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Increased voltage imbalance and decreased efficiency.

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Power equations for single phased electrical systems.

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Inductive loads and power factors with electrical three-phase motors.

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