Horsepower Calculator

Calculate horsepower from torque and RPM.

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Horsepower Calculator

HP = (Torque × RPM) / 5252

Torque (lb-ft)

RPM

Horsepower Calculator

Horsepower (HP) is a unit of power that measures the rate of work — specifically, how quickly a machine can do work. Originally defined by James Watt to compare steam engine power to horses, it is now used to rate engines, electric motors, and power tools.

Common Uses

Comparing engine power in vehicles
Sizing electric motors for industrial applications
Understanding power requirements for tools
Converting between HP and watts or kilowatts

Frequently Asked Questions

How many watts is 1 horsepower?

1 mechanical horsepower = 745.7 watts. 1 metric horsepower = 735.5 watts. 1 boiler horsepower = 9,810 watts. In most everyday contexts, 1 HP ≈ 746 watts is used.

What is the difference between BHP, WHP, and HP?

HP (horsepower) is a general measure. BHP (brake horsepower) is measured at the engine output shaft. WHP (wheel horsepower) is measured at the wheels, accounting for drivetrain losses (typically 15–20% less than BHP). WHP represents actual power delivered to the road.

Is this calculator free to use?

Yes. All calculators on zenicalculator.com are completely free with no registration required.

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