Power, torque and RPM
Torque describes rotational force and power describes the rate of doing work. Torque and RPM must refer to the same point on an engine curve. Do not combine peak torque with peak-power RPM when those peaks occur at different speeds.
P(kW) = T(N·m) × RPM × π ÷ 30000
Worked example
At 4,000 RPM, 200 N·m produces 83.78 kW, approximately 112.35 mechanical hp or 113.90 metric PS. In reverse mode, 150 mechanical hp at 4,000 RPM corresponds to approximately 267.03 N·m.
Which horsepower unit is used?
Mechanical horsepower is approximately 745.70 W; metric horsepower is 735.50 W. They differ, so both are reported explicitly. This conversion applies at the measurement point and does not infer drivetrain losses or wheel horsepower from crankshaft power.