Convert engine or motor power and rotational speed into torque. Enter horsepower, metric horsepower, or kilowatts together with RPM to calculate torque in pound-feet and newton-meters.
Torque and horsepower are directly connected through rotational speed. At the same horsepower, a lower RPM produces a higher calculated torque, while a higher RPM produces a lower torque.
Suppose an engine produces 300 mechanical horsepower at 6,000 RPM. The torque can be calculated using the standard imperial formula.
Torque = 300 × 5252 ÷ 6000 = approximately 262.60 lb-ft, which is approximately 356.07 N·m.
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For mechanical horsepower, multiply horsepower by 5252 and divide the result by RPM. The answer is torque in pound-feet.
Horsepower measures the rate at which work is performed, while torque measures rotational force. RPM provides the rotational speed needed to connect the two measurements.
Torque describes twisting or rotational force. Horsepower describes how quickly that force can perform work at a particular rotational speed.
The constant 5252 comes from converting rotational speed, force, distance, and time into mechanical horsepower and pound-feet units.
Yes. Select kilowatts from the power unit menu, enter the motor RPM, and the calculator will calculate torque in newton-meters and pound-feet.
Not necessarily. Torque also depends on RPM. Two engines with the same horsepower can produce different torque when operating at different rotational speeds.
When power remains constant, calculated torque decreases as RPM increases because the same power is being delivered at a faster rotational speed.
No. This calculator estimates torque at the engine or motor shaft. Wheel torque is also affected by transmission ratios, differential gearing, tire size, and drivetrain losses.