Unit Converters · Browser · Free

Horsepower to Watts

Enter an amount of horsepower, choose which kind of horsepower it is, and read the matching figure in watts. Nothing leaves your browser.

What this converter does

There is one number field and a select for the kind of unit: mechanical horsepower, electrical horsepower, or metric horsepower. Nothing is worked out until you press Convert, and the answer shows up in a card below the button. Copy writes the result and its unit to the clipboard, and Clear resets the form.

The three kinds are not equal, so the choice matters. The reference table on this page lists mechanical horsepower alongside watts, from 1 hp = 745.69987158227022 W up to 1000 hp = 745699.87158227022 W.

Horsepower to watts formula

Multiply the horsepower by the factor for the kind you chose: mechanical 1 hp = 745.69987158227022 W, electrical 1 hp = 746 W, metric 1 hp = 735.49875 W. One mechanical horsepower is 550 ft·lbf/s, which is exactly 745.69987158227022 W; one electrical horsepower is exactly 746 W; one metric horsepower is exactly 735.49875 W.

For example, 10 hp works out to 7456.9987158227022 W and 50 hp to 37284.993579113511 W on the mechanical scale, while 2 hp comes to 1491.39974316454044 W.