How to Calculate the Electrical Consumption of a Motor

Electrical power usage is measured in kilowatt-hours.
••• motor image by Petr Efremov from

If you have motor-powered devices in your household or garage, and want to factor their cost into your monthly utility bill, you can easily calculate how much electricity they use in kilowatt-hours, the standard unit of measurement for household electrical use. Motors typically have a horsepower measurement on their identification plate for measuring electrical consumption.

    Locate the identification plate on the motor and find the horsepower measurement, noted as HP.

    Enter the number into your calculator.

    Multiply your motor's horsepower rating by 0.746. According to WEN Technology's website, this will give you a measurement of approximate electrical consumption of the motor per hour in kilowatts.