1 W equals 0.00134102 hp. To convert W to hp, multiply the value by 0.00134102; divide by 0.00134102 to convert back. Enter any number above and the result appears instantly — free and entirely in your browser.
How do you convert W to hp?
The conversion formula is hp = W × 0.00134102. The conversion factor is fixed by definition, so the result is always exact.
W to hp conversion table
| W | hp |
|---|---|
| 1 W | 0.00134102 hp |
| 5 W | 0.00670511 hp |
| 10 W | 0.0134102 hp |
| 50 W | 0.0670511 hp |
| 100 W | 0.134102 hp |
| 150 W | 0.201153 hp |
What is W (W)?
The watt (W) is the SI unit of power: one joule per second. It measures the rate of energy use — a phone charger draws a few watts, an electric kettle around 2,000 W.
What is hp (hp)?
Mechanical horsepower (hp) equals about 745.7 watts. It is the imperial engine-power unit used in the US and UK — slightly larger than the metric PS.
Why convert W to hp?
Car engines are rated in kilowatts by EU law, but everyday talk uses horsepower — PS in Europe, hp in the US and UK. Converting between kW, PS and hp is a constant need when comparing cars.
One metric horsepower (PS) is defined as exactly 735.49875 W, so 1 kW = 1.3596 PS. Mechanical horsepower (hp) is 745.7 W, giving 1 kW = 1.341 hp — the two horsepowers differ by about 1.4%.
How to convert W to hp
- Enter the value in W into the left field of the converter.
- Read the result in hp instantly in the right field — it updates automatically.
- Use the swap button to reverse the direction (hp to W).
The converter runs entirely in your browser: no uploads, no queue, no limits. You can even use it offline.