Horsepower from torque
Horsepower from torque: use shaft torque, rotational speed. Review the formula, worked example and calculation steps.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
Power W = torque × 2π × rpm/60; mechanical hp = W/745.6998715822702
Variables & units
- Shaft torque
- N·m · minimum 0, maximum 1000000000000
- Rotational speed
- rpm · minimum 0, maximum 1000000000000
Worked example
100 N·m at 3,000 rpm produces approximately 42.129451 mechanical hp.
Assumptions
Mechanical horsepower, not metric PS. Does not estimate engine output from vehicle weight or acceleration.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
Use the default input values to find the answer. The reset icon restores those values.
Calculated on your device. Your latest 100 calculations stay in this browser.