Watts to HP Converter
Convert watt to horsepower (mechanical) instantly. 1 W = 0.001341022089 hp, worked steps and a full reference table.
How to use it
- Type the value in watt — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 1 W | 0.001341022089 hp |
| 5 W | 0.006705110444 hp |
| 10 W | 0.01341022089 hp |
| 100 W | 0.1341022089 hp |
One watt equals 0.0013410221 horsepower (mechanical)s (hp). To convert watts to horsepower (mechanical)s, multiply by 0.0013410221; to go back the other way, multiply by 745.69987 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 watts and horsepower (mechanical)s actually measure
Watt (W) — The watt is the SI unit of power — one joule per second. Light bulbs, appliances, audio equipment and solar panels.
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.
Watts to HP conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| W | hp |
|---|---|
| 1 W | 0.0013410221 hp |
| 2 W | 0.0026820442 hp |
| 5 W | 0.0067051104 hp |
| 10 W | 0.013410221 hp |
| 25 W | 0.033525552 hp |
| 50 W | 0.067051104 hp |
| 100 W | 0.13410221 hp |
How to convert watts to horsepower (mechanical)s by hand
Multiply the number of watts by 0.0013410221.
For example, 25 W × 0.0013410221 = 0.033525552 hp.
Going the other way, divide by 0.0013410221 — or multiply by 745.69987, 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.
Questions people ask
How many hp are in 1 W?
1 W equals exactly 0.001341022089 hp. Multiply any value in watt by 0.001341022089 to get horsepower (mechanical).
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Last updated 18 August 2026