Hp to W ConverterRight in Your Browser
Convert horsepower (hp) to watts (W). Horsepower (hp) is the traditional engine-power unit of the US and UK, defined by James Watt as 550 foot-pounds per second. The watt (W) is the SI power unit — one joule per second — used for bulbs, chargers and speakers. Everything is calculated locally in your browser — no server, and it works offline.
745.7 W
in watts (watt)
To convert horsepower to watts, multiply the horsepower value by 745.7.
Switch to W to HpHp to W Chart
| Horsepower (hp) | Watts (W) |
|---|---|
| 1 | 745.7 |
| 2 | 1491.4 |
| 3 | 2237.1 |
| 4 | 2982.8 |
| 5 | 3728.5 |
| 10 | 7457 |
| 20 | 14914 |
| 50 | 37285 |
| 100 | 74570 |
Frequently Asked Questions
How many watts are in a horsepower?
One horsepower equals 745.7 watts (1 hp = 745.7 W). So to go from horsepower to watts, multiply the horsepower value by 745.7.
What is the formula to convert horsepower to watts?
To convert horsepower to watts, multiply the horsepower value by 745.7. For example, 10 hp is 7457 W.
What is 150 horsepower in watts?
150 horsepower — a compact car's engine — is 111855 watts. The converter above works for any value, entirely in your browser.
Is the horsepower to watt conversion exact?
The factor used here is the defined value: 1 hp = 745.6998716 W. Results are rounded to six significant digits for readability, so for high-precision work use the full factor. This is the mechanical (imperial) horsepower of exactly 550 ft·lbf/s ≈ 745.7 W. The metric horsepower (PS/CV) used in continental Europe is slightly smaller at about 735.5 W.
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