Horsepower to Torque Converter
Formula
Torque (ft-lb) = (HP x 5252) / RPM | HP = (Torque x RPM) / 5252 | 1 ft-lb = 1.35582 Nm | 1 HP = 0.7457 kW
Frequently Asked Questions
What is the relationship between horsepower, torque, and RPM?
HP = (Torque in ft-lb x RPM) / 5252. The constant 5252 comes from converting between the units: it equals 33,000 ft-lb/min (1 HP) divided by 2pi. Horsepower and torque curves always cross at 5,252 RPM.
Why does torque decrease as RPM increases for the same horsepower?
Since HP = (Torque x RPM) / 5252, for a fixed horsepower, torque is inversely proportional to RPM. Higher RPM means each revolution does less work but more revolutions happen per unit time, keeping power constant.
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