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Calculators / Automotive / Horsepower from torque
Horsepower from torque calculator
Estimate mechanical horsepower from torque and rotational speed.
On this page
Mechanical horsepower285.61hp
Calculator controls
How to calculate
Estimate mechanical horsepower from torque and rotational speed.
Mechanical horsepower = torque*rpm/5252
Worked example
Torque (lb-ft): 300; Engine speed (rpm): 5000.
Mechanical horsepower: 285.61 hp.
Assumptions and limits
This imperial relationship assumes torque in pound-feet. Drivetrain losses separate engine and wheel measurements.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate mechanical horsepower from torque and rotational speed. The displayed figures use the inputs and formula shown on this page.
When this tool is useful
Use the horsepower from torque to compare a scenario, check an estimate, or verify a manual calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Torque (lb-ft) | Enter a number of at least -1000000000 and no more than 1000000000. |
| Engine speed (rpm) | Enter a number of at least 0 and no more than 100000. |
Frequently asked questions
What should I check before using the horsepower from torque result?
This imperial relationship assumes torque in pound-feet. Drivetrain losses separate engine and wheel measurements.
Is this horsepower from torque result exact?
It is exact for the stated mathematical model and entered values. Real-world results can differ when rates, timing, fees, definitions or measurement conditions differ.