Horsepower Calculator
Calculate mechanical horsepower from torque and engine speed.
How to Use the Horsepower Calculator
Enter the relevant force, distance, time or power inputs used by the tool to estimate mechanical horsepower.
Practical Example
A mechanical output of about 746 watts is approximately 1 horsepower.
Factors That Affect the Result
Mechanical losses, unit conversions, measurement accuracy and whether input or output power is being measured can change the practical result.
Frequently Asked Questions
How many watts are in one horsepower?
Mechanical horsepower is about 745.7 watts.
Is horsepower the same as torque?
No.
Does efficiency matter?
Yes, when comparing input and output power.
Power, Torque and Horsepower
Horsepower is a unit of power—the rate of doing work—not a direct measure of force or torque. Mechanical horsepower conversions depend on the input units and rotational relationships used. Real machines also have efficiency losses, so output power can be lower than input power.