Convert watts to horsepower for engine and motor power calculations.
Convert watts to horsepower using the official US customary standard conversion factor of 1 horsepower = 745.699871582 watts.
Convert watts to horsepower for engine and motor power calculations.
Convert watts to horsepower using the official US customary standard conversion factor of 1 horsepower = 745.699871582 watts.
High precision needed for engine specifications and industrial motor selection. General discussions can use 1-2 decimal places.
Common mistake: Using approximate 746 watts per horsepower. While very close, using the exact 745.7 watts is important for precise engineering calculations. Also, confusing metric horsepower (PS = 735.5W) with mechanical horsepower (745.7W).
| Item | Watts | Horsepower |
|---|---|---|
| Light bulb | 100 | 0.13 |
| Electric drill | 500 | 0.67 |
| Lawn mower | 1500 | 2.01 |
| Car engine | 300000 | 402.34 |
| Jet engine | 10000000 | 13410.22 |
1 horsepower equals approximately 745.7 watts.
Horsepower is the traditional unit for measuring engine power in the US.
The official US customary standard defines 1 mechanical horsepower as exactly 745.699871582 watts.
PS (Pferdestärke) is metric horsepower (735.5W), while US hp is mechanical horsepower (745.7W). European car specs often use PS.
Horsepower has historical significance and is widely understood by consumers for comparing vehicle performance.
1000 watts equals approximately 1.341 horsepower.
Last Updated: 2026 · Reviewed by the UnitFig editorial team