Shaft Power Calculator – kW, HP, Torque and RPM

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Formula

Power (kW) = Torque (Nm) × RPM / 9549
Power (HP) = Torque × RPM / 7121
Constant 9549 = 60,000 / (2π)

100 Nm at 1450 RPM:
Power = 100×1450/9549 = 15.18 kW = 20.4 HP

Torque (Nm) = Power (kW) × 9549 / RPM. Example: 15 kW at 1450 RPM = 15×9549/1450 = 98.8 Nm.

1 HP = 0.7457 kW, so 1 kW = 1.341 HP. kW is the SI unit used internationally. HP is common in the US and for engine specifications.