Horsepower From Torque Calculator
Convert torque and RPM to horsepower and kilowatts.
Enter your values
ⓘ Live results
Results
- Horsepower
- 259.7 hp
- Kilowatts
- 193.7 kW
- Metric PS
- 263.3 PS
- Torque
- 310 lb-ft / 420.3 Nm
Quick answer
Horsepower = torque (lb-ft) × RPM ÷ 5252. The two curves always cross at 5,252 rpm because that is where the constant cancels.
hp = torque × rpm ÷ 5252
How to use the Horsepower From Torque Calculator
- 1Pick whether your torque figure is in lb-ft or Nm.
- 2Enter the torque value and the RPM it was measured at.
- 3Read horsepower, kW and PS together.
Worked example
Using the values the calculator loads with:
Inputs
- Torque unitlb-ft
- Torque310
- Engine speed4400 rpm
Results
- Horsepower259.7 hp
- Kilowatts193.7 kW
- Metric PS263.3 PS
- Torque310 lb-ft / 420.3 Nm
Frequently asked questions
Why do hp and torque cross at 5252 rpm?
Because horsepower = torque × rpm ÷ 5252, the two values are numerically equal exactly at 5,252 rpm on any engine.
Is kW or hp bigger?
One horsepower is about 0.746 kW, so a 200 hp engine is roughly 149 kW.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.