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Everyday Life Calculators
Horsepower Calculator
Calculate an engine’s horsepower from its torque output and engine speed in RPM.
Horsepower
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About the Horsepower Calculator
Horsepower and torque are related through engine speed. At exactly 5,252 RPM, horsepower and torque (in lb-ft) are always numerically equal — that constant comes from converting rotational torque into a power unit.
Formula: Horsepower = (Torque in lb-ft × RPM) ÷ 5,252
Use this to estimate peak horsepower from a dyno torque reading, or to understand how power changes across an engine's RPM range.
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