Convert Horsepower (mechanical) to Watts
hp to W · power conversion
What are horsepower (mechanical) and watts?
Mechanical horsepower equals about 745.7 watts, the traditional measure of engine output. The watt is the SI unit of power, one joule per second. For reference: a typical car engine makes 100–150 kW (about 134–201 hp).
How to convert horsepower (mechanical) to watts
1 hp = 745.7 W. To convert, multiply the number of horsepower (mechanical) by 745.7. For example, 5 hp = 3,728.5 W, and 20 hp = 14,914 W. To go the other way, multiply watts by 0.00134102 (since 1 W = 0.00134102 hp).
Horsepower (mechanical) to Watts conversion table
| Horsepower (mechanical) (hp) | Watts (W) |
|---|---|
| 1 | 745.7 |
| 10 | 7,457 |
| 100 | 74,570 |
| 500 | 372,850 |
| 1,000 | 745,700 |
| 2,000 | 1,491,400 |
| 5,000 | 3,728,500 |
FAQ
What is 1 hp in W?
1 hp = 745.7 W. To convert any amount, multiply the number of horsepower (mechanical) by 745.7.
How do I convert watts back to horsepower (mechanical)?
Go the other way: 1 W = 0.00134102 hp, so multiply watts by 0.00134102 to get horsepower (mechanical).
Is a horsepower (mechanical) bigger than a watt?
Yes — 1 hp is the larger unit, equal to 745.7 W.
Are these power conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.