# Kilowatts Calculator for AC Motors – How to Calculate Kilowatts (kW) of AC Motor?

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With the help of this calculator you can find kilowatts of AC motor. You can find kW of both single phase and three phase AC motors.

## Kilowatts Calculator for AC Motors

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How to use the calculator?

• From the drop down, select the phase.
• For this calculator, note down the voltage, rated current, power factor and efficiency. You can find details from the motor’s nameplate.
• Enter the data collected in respective fields.
• The calculator would show automatically the calculated value.

### How to calculate kilowatts of AC motor?

#### Single Phase formula to calculate kilowatts of AC Motor

For single phase, kilowatts (kW) is equal to rated voltage (V) multiply by current multiply by power factor multiply by efficiency. Divide that result by thousand to get the final result in kilowatts.

Example: Let us say you have 230 VAC motor having efficiency 0.60, power factor 0.55 and current is 10 amps. The calculated horsepower of AC motor is 0.75 kW.

#### Three Phase formula to calculate kilowatts of AC Motor

For three phase, kilowatts (kW) is equal to square-root of three multiply by rated voltage (V) multiply by rated current (I) multiply by power factor multiply by efficiency whole divide by thousand.

Example: Let us say you have 415 VAC motor having power factor 0.85, efficiency 0.93, and rated current 726. For this motor, the calculated power (in kW) of AC motor is 412.034 kW.