Horsepower Calculator
Calculate engine horsepower from torque & RPM, vehicle performance, or convert between power units.
Ad
Coursera Holi Offer
Build your AI fluency and get more done, faster. Get the AI skills employers are looking for and create 20+ solutions you can use at work, right away.
Watts
0
W
Kilowatts
0
kW
BTU/hr
0
BTU/hr
Metric HP
0
PS
How It Works
Horsepower is a unit of power that measures the rate at which work is done. It was defined by James Watt as 33,000 foot-pounds per minute to compare steam engine output to draft horses.
This calculator supports three modes: calculating HP from torque and RPM (dynamometer style), estimating HP from quarter-mile time and vehicle weight, and converting between power units.
Formulas
Last Updated: February 28, 2026
Disclaimer: For estimation purposes only. Actual results depend on drivetrain losses, aerodynamics, and conditions.