Use this free calculator to estimate motor energy from horsepower, efficiency and run time. Enter your power use and electricity rate to see the units, cost and formula.
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Every input includes a simple explanation.
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Rated power can be different from average power while the appliance is running.
Voltage, automatic on-off cycling and equipment condition can change real use.
Use this as a budget estimate. The appliance label, how often it runs and all charges on your tariff determine the real bill.
Horsepower is converted to mechanical output and divided by efficiency to estimate electrical input, unless a known input-watt value is used.
Check the motor plate, pump efficiency and real daily run time; borewell head and water demand affect operation.
Treating 1 hp as exactly 746 W from the grid ignores motor losses and can understate billed energy.
Energy (kWh) = watts × quantity × hours × days × operating factor ÷ 1,000
Check the motor plate, pump efficiency and real daily run time; borewell head and water demand affect operation.
Treating 1 hp as exactly 746 W from the grid ignores motor losses and can understate billed energy.
Use this as a budget estimate. The appliance label, how often it runs and all charges on your tariff determine the real bill.