Power & Torque Converter
Convert power between kilowatts, metric horsepower (ch/PS) and imperial horsepower, and between Nm and lb-ft, or derive torque from power at a given RPM.
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The power–torque link
Power (kW) = torque (Nm) × RPM ÷ 9549. At the wheels, acceleration follows the torque curve; peak power tells you top-end potential.
- 1 ch = 0.7355 kW
- 1 hp (imperial) = 0.7457 kW
- 1 Nm = 0.7376 lb-ft
- Diesel engines make peak torque at low RPM; petrol at high RPM
FAQ
Diesel burns fuel over a longer period of the power stroke at high pressure, producing more torque at low RPM. That is why trucks are diesel.
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