What is the Horsepower Calculator?
Calculate engine horsepower from torque and RPM.
Enter torque and engine speed and the Horsepower Calculator returns power and in kilowatts. Results update as you type, and nothing you enter leaves your device.
How it is calculated
Power (W) = Torque × 2π × RPM ÷ 60
1 hp = 745.7 W
How to use it
- Enter torque in N·m.
- Enter engine speed in rpm.
- Read power in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Horsepower Calculator use?
It uses: Power (W) = Torque × 2π × RPM ÷ 60; 1 hp = 745.7 W.
What do I need to use the Horsepower Calculator?
You need torque and engine speed. Sensible starting values are filled in so you can see how it works straight away.
Is the Horsepower Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.