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About the Horsepower Calculator
This Horsepower Calculator computes engine horsepower, torque, and power output for automotive applications. Enter your engine data and the tool returns the missing values in seconds. It works for gasoline and diesel engines in cars, trucks, and motorcycles.
The calculation uses the standard formula HP = Torque × RPM ÷ 5252, where 5252 is a fixed constant that links rotational speed to power. You supply torque in pound-feet and engine speed in RPM, or you can work backward from horsepower to find torque. Values from a dynamometer test give the most accurate results. For track-based estimates, remember that quarter-mile time and vehicle weight also change the outcome, so compare runs made under similar conditions.
- Enter the torque value in pound-feet from your engine specifications or dyno sheet.
- Type the engine speed in RPM where the torque was measured.
- Press calculate to see horsepower, or enter horsepower to solve for torque.