Horsepower from Torque and RPM

Horsepower, kilowatts, and a solve-for selector across HP, torque, and RPM via HP = Torque * RPM / 5252.

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Formula and source

HP = Torque(lb-ft) * RPM / 5252 (5252 = 33,000 / 2*pi); kW = HP * 0.7457. Torque and HP are equal at 5252 RPM by definition. Solve for any of {HP, torque, RPM}.

Classical definition of mechanical power (Watt's 33,000 ft-lb/min); SAE J1349 engine-power rating, by name.

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