Calculators
Horsepower Calculator
Calculate horsepower from torque and RPM.
Free account14-day Pro trialWorks in your browser
Sign in to use this tool
Create a free account to unlock every tool — plus a 14-day free trial of HQ Pro, no card required.
About the Horsepower Calculator
Horsepower and torque are linked by engine speed. Enter torque (lb-ft) and RPM and the calculator returns horsepower using hp = torque × rpm ÷ 5252. It's the classic formula car enthusiasts use to convert dyno torque figures into power.
How to use the Horsepower Calculator
- 01Enter your torque and engine RPM.
- 02Read the result instantly — it recalculates as you type.
- 03Adjust the numbers to model different scenarios.
Frequently asked questions
How do you calculate horsepower?
Horsepower = torque (lb-ft) × RPM ÷ 5252. The two curves always cross at 5252 RPM.
Torque vs horsepower?
Torque is rotational force; horsepower is the rate of doing work (torque over time). Both matter for how a car feels.