Horsepower from Torque Calculator
Calculate horsepower from torque and RPM
About this calculator
This horsepower from torque calculator converts torque and RPM measurements into horsepower values using the standard formula: HP = (Torque × RPM) ÷ 5,252. It's essential for automotive enthusiasts, mechanics, and engineers who need to determine engine power output from dyno readings or specifications. Whether you're comparing engine performance, calculating power-to-weight ratios, or verifying manufacturer claims, this tool provides quick and accurate horsepower calculations from your torque and RPM data.
How to use
Enter the torque value in pound-feet (lb-ft) and the engine speed in revolutions per minute (RPM) into their respective input fields. The calculator will instantly compute and display the corresponding horsepower value. Make sure your torque measurement is at the same RPM you're entering for accurate results.
Frequently asked questions
What's the formula for calculating horsepower from torque?
The formula is: Horsepower = (Torque in lb-ft × RPM) ÷ 5,252. The constant 5,252 comes from unit conversion factors.
Why do torque and horsepower curves cross at 5,252 RPM?
At 5,252 RPM, the numerical values of torque (lb-ft) and horsepower are equal due to the mathematical relationship in the conversion formula.
Can I use this calculator for metric units?
This calculator uses imperial units (lb-ft). For metric units, convert Newton-meters to lb-ft by multiplying by 0.7376 first.