Convert horsepower to watts
Enter a value in horsepower (hp) to get watts (W). One horsepower (mechanical) is 745.6999 watts; one watt is 0.001341 horsepower.
How to use the Horsepower (mechanical) to watt
- Type the number of horsepower.
- Click Convert.
- Read the result in watts, plus the same value in every other power unit.
hp to W formula
watts = horsepower × 745.6999. To go the other way, horsepower = watts × 0.001341 (see watts to horsepower).
Worked example
12 hp × 745.6999 = 8,948.4 W.
Horsepower to watts conversion table
| Horsepower | Watts |
|---|---|
| 0.1 hp | 74.57 W |
| 0.5 hp | 372.8499 W |
| 1 hp | 745.6999 W |
| 2 hp | 1,491.4 W |
| 3 hp | 2,237.1 W |
| 5 hp | 3,728.5 W |
| 10 hp | 7,457 W |
| 20 hp | 14,914 W |
| 25 hp | 18,642.5 W |
| 50 hp | 37,284.99 W |
| 100 hp | 74,569.99 W |
| 250 hp | 186,424.97 W |
| 500 hp | 372,849.94 W |
| 1,000 hp | 745,699.87 W |
About the horsepower (mechanical)
Exactly 745.7 W. Car engines in the USA and UK.
About the watt
The SI unit: one joule per second. Appliances and light bulbs.
Related conversions
watts to horsepower · horsepower to kilowatts · horsepower to metric horsepower · any unit.
Frequently asked questions
How many watts in a horsepower (mechanical)?
745.6999 watts.
How many horsepower in a watt?
0.001341 horsepower.
Is the factor exact?
The factor 745.6999 is derived from the units' exact definitions; only the display is rounded.
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Last updated 2026-09-23.