What is this calculator?
Estimate mechanical horsepower from engine torque and speed.
What can you use it for?
Use it for practical planning, conversions, measurement or checking the result described here. Estimate mechanical horsepower from engine torque and speed.
How to use it
- Enter torque (lb-ft).
- Enter engine speed (rpm).
- Select Calculate (or Generate for random tools).
- Read the answer and any additional results below the form. Check the units and the limits of the method.
Formula and method
The formula uses the units and definitions shown above. Each input is substituted before the arithmetic is evaluated; the calculated output is rounded for display.
Worked example
Torque (lb-ft): 300, Engine speed (rpm): 5000. The result is 285.59933215 hp (result).
Assumptions and limits
Mechanical power relation. Does not predict wheel horsepower or account for drivetrain loss.
Frequently asked questions
What inputs does the Engine Horsepower Calculator need?
Use torque (lb-ft), engine speed (rpm). Read the answer and any additional results below the form. Check the units and the limits of the method.
What assumptions apply to the Engine Horsepower Calculator?
Mechanical power relation. Does not predict wheel horsepower or account for drivetrain loss.