Watts to Horsepower Converter

Enter watts to get mechanical horsepower — 1,000 W is 1.341 hp — with metric (PS) and electrical horsepower listed below.

This tool runs entirely in your browser.

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How to use the Watts to Horsepower Converter

1Enter a value.
2Choose the unit to convert from and to (use ⇄ to swap).
3Read the result, or scan the table for every unit at once.

What is the Power Converter?

There are three common horsepowers: mechanical (imperial) hp = 745.7 W, used for US and UK car engines; metric hp (PS, CV, pk) = 735.5 W, used in Europe and Japan; and electrical hp = exactly 746 W, used for electric motors.

Air conditioners and heaters are rated in BTU per hour: 1 W = 3.412 BTU/h, and one “ton” of refrigeration is 12,000 BTU/h (about 3.517 kW) — the cooling power of melting one short ton of ice per day.

Results show up to 10 significant digits; very large or small values switch to scientific notation.

Frequently asked questions

Is PS the same as horsepower?

Almost: 1 PS (metric horsepower) is 735.5 W, about 1.4 % less than mechanical hp (745.7 W). A 150 PS car engine is about 148 hp.

How many watts is 1 horsepower?

Mechanical horsepower is 745.7 W, metric horsepower 735.5 W and electrical horsepower exactly 746 W.

Is the Power Converter free and private?

Yes. The Power Converter is free, needs no account, and runs entirely in your browser. What you type is never sent to a server or stored.

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