HP to Watts Converter
Type a value in horsepower to see it in watts as you type, with the exact formula and a reference chart.
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- Metric horsepower
- 5.0693 PS
How this was calculated
- 1 horsepower = 745.6998716 watts
- 5 × 745.6998716 = 3,728.4994 W
| hp | W |
|---|---|
| 0.25 hp | 186.425 W |
| 0.5 hp | 372.85 W |
| 0.75 hp | 559.275 W |
| 1 hp | 745.7 W |
| 1.5 hp | 1,118.55 W |
| 2 hp | 1,491.4 W |
| 3 hp | 2,237.1 W |
| 5 hp | 3,728.5 W |
| 7.5 hp | 5,592.75 W |
| 10 hp | 7,457 W |
| 15 hp | 11,185.5 W |
| 20 hp | 14,914 W |
| 50 hp | 37,285 W |
| 100 hp | 74,570 W |
| 200 hp | 149,140 W |
| 300 hp | 223,710 W |
| 500 hp | 372,850 W |
| W | hp |
|---|---|
| 100 W | 0.134102 hp |
| 200 W | 0.268204 hp |
| 500 W | 0.670511 hp |
| 1,000 W | 1.34102 hp |
| 2,000 W | 2.68204 hp |
| 5,000 W | 6.70511 hp |
| 10,000 W | 13.4102 hp |
| 20,000 W | 26.8204 hp |
| 50,000 W | 67.0511 hp |
| 100,000 W | 134.102 hp |
| 200,000 W | 268.204 hp |
| 500,000 W | 670.511 hp |
How to convert horsepower to watts
1 horsepower = 745.6998716 watts. To convert horsepower to watts, multiply by 745.6998716. Mechanical horsepower is 550 foot-pounds per second, exactly 745.6998715822702 W (metric horsepower, PS, is 735.49875 W). The watt is the SI unit of power, one joule per second.
Worked examples
- 1 horsepower = 745.7 W (1 × 745.69987)
- 5 horsepower = 3,728.5 W (5 × 745.69987)
- 200 horsepower = 149,140 W (200 × 745.69987)
Where this conversion comes up
Horsepower are used for car, boat and lawn-mower engines; watts for light bulbs, chargers and appliances. One mechanical horsepower is 745.7 W, so a 1/2 hp pump motor draws about 373 W of shaft power and a 200 hp engine makes about 149 kW. Electrical input is higher than shaft output because motors are less than 100% efficient, and metric horsepower (PS) is slightly smaller at 735.5 W.
Quick estimate
Multiply by 746, or by 750 for a quick estimate (0.6% high).
Common mistakes
- Dividing instead of multiplying. A watt is smaller than a horsepower, so the number of watts must come out larger: 1 horsepower = 745.7 W.
Frequently asked questions
How do you convert horsepower to watts?
Multiply the horsepower by 745.6998716. For example, 5 horsepower is 3,728.5 watts.
How many watts are in one horsepower?
One horsepower is 745.6998716 watts. Mechanical horsepower is 550 foot-pounds per second, exactly 745.6998715822702 W (metric horsepower, PS, is 735.49875 W).
What is 200 horsepower in watts?
200 horsepower is 149,140 watts.
Is there a quick way to estimate horsepower to watts?
Multiply by 746, or by 750 for a quick estimate (0.6% high).