Watts to Horsepower Calculator
Convert watts and kilowatts to horsepower instantly, mechanical and electrical.
Convert power in watts (or kilowatts) to horsepower. Useful for electric motors, power tools, and any device rated in watts that you want to compare in HP.
Watts to HP Formula
How to Use This Calculator
- Enter the power in watts.
- Read the horsepower result, with kilowatts shown too.
Worked Example
Frequently Asked Questions
One mechanical horsepower equals 745.7 watts. Electrical horsepower is 746 watts and metric horsepower (PS) is 735.5 watts.
Divide the wattage by 745.7. For example, 1,500 watts ÷ 745.7 = 2.01 horsepower.
Multiply kilowatts by 1.341, or convert kW to watts first (×1000) then divide by 745.7.
Mechanical, electrical, and metric horsepower were defined slightly differently. Mechanical (745.7 W) is most common for engines; electrical (746 W) for motors.
Almost — 1,000 watts is about 1.34 horsepower, since one HP is 745.7 watts.