CalcPairsHorsepower to Kilowatts Converter (hp to kW)
100 horsepower is 74.569987 kW. The mechanical horsepower is defined as 550 foot-pounds per second, which is exactly 0.745699872 kW — so a 300 hp sports car makes 223.71 kW, and a 150 kW EV motor makes 201.15 hp.
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How this conversion works
Car brochures in the US sell horsepower; the rest of the world — and every EV spec sheet — speaks kilowatts. Type either side: a 1.5 hp pool pump is 1.12 kW; a 7.4 kW home charger delivers the power of about 10 hp, continuously.
This page uses the mechanical (imperial) horsepower of cars and motors. Two cousins share the name: metric horsepower (PS), at 0.735499 kW — German car figures in PS run about 1.4% smaller than the same number in hp — and boiler horsepower, an industrial unit nearly ten times larger. If a German brochure says 150 PS, that is 110.3 kW or 147.9 hp.
The exact formula
kilowatts = horsepower × 0.745699872
1 hp = 550 ft·lbf/s = 745.699872 W exactly. The reverse is horsepower = kilowatts ÷ 0.745699872 (1 kW = 1.341022 hp).
Horsepower to Kilowatts conversion table
| Horsepower (hp) | Kilowatts (kW) |
|---|---|
| 10 | 7.456999 |
| 25 | 18.642497 |
| 50 | 37.284994 |
| 75 | 55.92749 |
| 100 | 74.569987 |
| 125 | 93.212484 |
| 150 | 111.854981 |
| 200 | 149.139974 |
| 250 | 186.424968 |
| 300 | 223.709962 |
| Horsepower (hp) | Kilowatts (kW) |
|---|---|
| 400 | 298.279949 |
| 500 | 372.849936 |
| 750 | 559.274904 |
| 1000 | 745.699872 |
Frequently asked questions
How many kW are in 200 hp?
149.139974 kW.
Why do EVs quote kW instead of hp?
Because their motors are electrical machines rated like any other: output in kilowatts is the native engineering unit, and 1 kW = 1.341 hp converts it for comparison.
Is PS the same as hp?
Almost but not quite: 1 PS (metric horsepower) = 0.98632 hp. A car quoted at 200 PS makes 197.26 hp.