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One horsepower is a fixed amount of power, so converting to watts is a simple multiplication. Mechanical horsepower equals 745.699872 watts, which is why a 1 hp motor is often labelled as roughly 746 W.
To size wiring, generators, or inverters for a motor rated in horsepower, convert to watts (or kilowatts) first. Choose the horsepower standard that matches the equipment's origin to keep the result accurate.
W = hp × 745.699872 (mechanical)W = hp × 746 (electric)W = hp × 735.49875 (metric / PS)1 mechanical hp = 745.7 W; 1 electric hp = 746 W; 1 metric hp = 735.5 W.
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| Horsepower↕ | Watts↕ | Kilowatts↕ |
|---|---|---|
| 0.5 hp | 373 W | 0.373 kW |
| 1 hp | 746 W | 0.746 kW |
| 2 hp | 1,491 W | 1.491 kW |
| 5 hp | 3,728 W | 3.728 kW |
| 10 hp | 7,457 W | 7.457 kW |
| 25 hp | 18,642 W | 18.64 kW |
| 100 hp | 74,570 W | 74.57 kW |
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How do you convert horsepower to watts?
Multiply the horsepower by 745.7 for mechanical horsepower. For example, 5 hp × 745.7 = 3,728 W (about 3.73 kW).
Is 1 hp exactly 746 watts?
Mechanical horsepower is 745.699872 W, which rounds to 746 W. Electric horsepower is defined as exactly 746 W, so the two are effectively identical for everyday use.
How many watts is a 2 hp motor?
A 2 hp motor delivers about 1,491 watts of mechanical output (2 × 745.7). Its electrical input will be higher because motors are not 100% efficient.