Horsepower & Torque Converter

hp, kW and PS; Nm and lb-ft; power from torque and RPM; power-to-weight.

Power
Torque
Power from torque and RPM
Power-to-weight

Formulas

1 hp (mechanical) = 0.7457 kW. 1 PS = 0.7355 kW. 1 lb-ft = 1.3558 Nm. Power (kW) = torque (Nm) × RPM ÷ 9549. Power (hp) = torque (lb-ft) × RPM ÷ 5252, which is why hp and lb-ft curves cross at 5,252 RPM.

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