Motor FLA Calculator

This motor full-load amperage (FLA) calculator allows you to calculate the full-load current of the AC electric motor.


  1. Select the number of phases from the drop-down list
  2. Enter the motor rated voltage in volts (V)
  3. Enter the motor power rating and select the appropriate unit (HP or kW)
  4. Enter the power factor and efficiency of the motor
  5. Click on the "Calculate" button to see the results.

Note: Please note that this calculator is provided for information purposes only. Typically, the FLA value is shown on the motor nameplate.

Motor Full Load Amperage Calculator




The motor FLA calculator uses the following formulas:

Single Phase AC Motor FLA (Amperes) = (P [kW] × 1000) / (V × cos ϕ)

Single Phase AC Motor FLA (Amperes) = (P [HP] × 746) / (V × cos ϕ × η)

Three Phase AC Motor FLA (Amperes) = (P [kW] × 1000) / (V × 1.732 × cos ϕ)

Three Phase AC Motor FLA (Amperes) = (P [HP] × 746) / (V × 1.732 × cos ϕ × η)


P [HP] , P [kW] = Motor power rating (HP or kW),

V = Motor rated voltage (Volts),

η = Motor efficiency in decimal form,

cos ϕ = Motor power factor,

1000 = Conversion factor to convert kW to W,

746 = Conversion factor to convert HP to W.

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