HP to Watts Converter

One horsepower (mechanical) equals 745.69987 watts (W). To convert horsepower (mechanical)s to watts, multiply by 745.69987; to go back the other way, multiply by 0.0013410221 instead.

The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.

What horsepower (mechanical)s and watts actually measure

Horsepower (mechanical) (hp) — Mechanical horsepower is 745.7 watts, a figure James Watt derived from the work rate of a dray horse. Car and engine ratings in the US and UK.

Watt (W) — The watt is the SI unit of power — one joule per second. Light bulbs, appliances, audio equipment and solar panels.

HP to Watts conversion table

The most common values, worked out in advance. Anything not listed can be typed straight into the converter.

How to convert horsepower (mechanical)s to watts by hand

Multiply the number of horsepower (mechanical)s by 745.69987.

For example, 25 hp × 745.69987 = 18642.497 W.

Going the other way, divide by 745.69987 — or multiply by 0.0013410221, which is the same thing and easier to do in your head.

Everything runs in your browser

There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.