Mechanical Horsepower to Watts Converter
1 mechanical horsepower ≈ 745.699872 watts
Metric horsepower (PS) is a different unit, about 1.4% smaller.
1 mechanical horsepower equals 745.7 watts
How to convert mechanical horsepower to watts
Power is energy transferred per time: 1 W = 1 J/s. Mechanical, metric and electrical horsepower have different definitions; select the version stated on the equipment rating.
W = hp × 745.6998716One mechanical horsepower is 745.6998716 watts, so a single multiplication converts any value.
7,457 W ≈ 10 × 745.6998716Metric horsepower (PS) is a different unit, about 1.4% smaller.
Mechanical horsepower to watts conversion table
Common values in mechanical horsepower, converted to watts.
| Mechanical horsepower (hp) | Watts (W) |
|---|---|
| 1 | 745.69987 |
| 2 | 1,491.3997 |
| 3 | 2,237.0996 |
| 4 | 2,982.7995 |
| 5 | 3,728.4994 |
| 10 | 7,456.9987 |
| 20 | 14,913.997 |
| 25 | 18,642.497 |
| 50 | 37,284.994 |
| 100 | 74,569.987 |
| 250 | 186,424.97 |
| 500 | 372,849.94 |
| 1,000 | 745,699.87 |
About these units
mechanical horsepowerhp
Exactly 550 foot-pounds per second: about 745.7 watts. The US and UK engine unit.
wattW
The SI derived unit of power: one joule per second.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.