Watts to Horsepower (mechanical)
Type a value in Watts and get the result in Horsepower (mechanical), calculated exactly.
100 Watts ≈ 0.134102209 Horsepower (mechanical)
Precision
Exact factorRounded for display to about 10 significant digits.
Slide rule
Drag to scrub · arrow keys step · Shift × 10Paper tape
ConvertThemAll
- Your conversions print here.
0 lines · kept on this device only
Formula
hp = W ÷ 745.699871582
To convert Watts to Horsepower (mechanical), divide the value by 745.699871582.
Worked examples
- 1 W ÷ 745.699871582 ≈ 0.00134102209 hp
- 100 W ÷ 745.699871582 ≈ 0.134102209 hp
- 50 W ÷ 745.699871582 ≈ 0.06705110448 hp
This factor is exact by definition.
Conversion table
| Watts (W) | Horsepower (mechanical) (hp) |
|---|---|
| 1 | ≈ 0.001341022 |
| 2 | ≈ 0.002682044 |
| 3 | ≈ 0.004023066 |
| 4 | ≈ 0.005364088 |
| 5 | ≈ 0.00670511 |
| 6 | ≈ 0.008046133 |
| 7 | ≈ 0.009387155 |
| 8 | ≈ 0.01072818 |
| 9 | ≈ 0.0120692 |
| 10 | ≈ 0.01341022 |
| 15 | ≈ 0.02011533 |
| 20 | ≈ 0.02682044 |
| 25 | ≈ 0.03352555 |
| 30 | ≈ 0.04023066 |
| 40 | ≈ 0.05364088 |
| 50 | ≈ 0.0670511 |
| 60 | ≈ 0.08046133 |
| 70 | ≈ 0.09387155 |
| 75 | ≈ 0.1005767 |
| 80 | ≈ 0.1072818 |
| 90 | ≈ 0.120692 |
| 100 | ≈ 0.1341022 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Horsepower (mechanical) to Watts
| Horsepower (mechanical) (hp) | Watts (W) |
|---|---|
| 1 | ≈ 745.6999 |
| 2 | ≈ 1,491.4 |
| 3 | ≈ 2,237.1 |
| 4 | ≈ 2,982.799 |
| 5 | ≈ 3,728.499 |
| 6 | ≈ 4,474.199 |
| 7 | ≈ 5,219.899 |
| 8 | ≈ 5,965.599 |
| 9 | ≈ 6,711.299 |
| 10 | ≈ 7,456.999 |
| 15 | ≈ 11,185.5 |
| 20 | ≈ 14,914 |
| 25 | ≈ 18,642.5 |
| 30 | ≈ 22,371 |
| 40 | ≈ 29,827.99 |
| 50 | 37,284.993579113511 |
| 60 | ≈ 44,741.99 |
| 70 | ≈ 52,198.99 |
| 75 | ≈ 55,927.49 |
| 80 | ≈ 59,655.99 |
| 90 | ≈ 67,112.99 |
| 100 | 74,569.987158227022 |
Unit definitions
- Watts W
- The SI unit of power: one joule per second.
- Horsepower (mechanical) hp
- 550 foot-pounds per second: exactly 745.69987158227022 watts.
Questions people ask
Watts to Horsepower (mechanical): what is the conversion factor?
One W is ≈ 0.00134102209 hp.
How do I convert Watts to Horsepower (mechanical)?
Use the formula above. For example, 100 W = ≈ 0.134102209 hp.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.