Horsepower to Kilowatts Converter (hp to kW)
1 hp = 0.745700 kW (mechanical horsepower, 550 ft·lbf/s). Convert US engine and motor ratings from horsepower to kilowatts, with both charts.
Kilowatt (kW) = Horsepower (hp) × 0.745699871582
Horsepower (hp): The mechanical horsepower selected here is exactly 550 foot-pounds-force per second, about 745.700 W. The bhp alias uses this mechanical unit; brake power describes a measurement of output, while other horsepower definitions, such as metric PS, have different values.
Kilowatt (kW): A kilowatt (kW) is 1,000 watts. Electric heaters, EV chargers, solar inverters and car engines outside the US are rated in kW.
| Horsepower (hp) | Kilowatt (kW) |
|---|---|
| 1 | 0.745699871582 |
| 5 | 3.72849935791 |
| 10 | 7.45699871582 |
| 25 | 18.6424967896 |
| 50 | 37.2849935791 |
| 100 | 74.5699871582 |
US car brochures, lawn equipment, boat motors and pool pumps are rated in horsepower, while European registration documents, spec sheets for electric motors and most engineering standards use kilowatts. The horsepower on this page is the mechanical (imperial) horsepower, defined as 550 foot-pounds-force per second, which works out to 745.699872 watts. The standard IEC motor ratings of 0.75, 1.1 and 2.2 kW in the second chart correspond to the familiar 1, 1.5 and 3 hp motor sizes.
Two other horsepowers turn up often. The metric horsepower, written PS, CV or pk in European car ads, is 735.49875 W, about 1.4% smaller; electrical horsepower on motor nameplates is exactly 746 W. A brochure figure of 300 PS therefore means about 296 hp in the mechanical sense, so check which one a number uses before converting.
How to use this tool
- Type a value in the Horsepower box to see it in kilowatts, or type in the Kilowatt box to convert the other way.
- Press ⇄ to swap the two units, or Load example for a typical value.
- Check the charts below for common values; for other units, open the Power converter.
Formula
Kilowatt (kW) = Horsepower (hp) × 0.745699871582
Horsepower (hp) = Kilowatt (kW) × 1.3410220896
Both factors come from exact definitions: 1 kilowatt = 1.3410220896 horsepower and 1 horsepower = 0.745699871582 kilowatts (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
200 hp × 0.745699871582 ≈ 149.14 kW
150 kW × 1.3410220896 ≈ 201.153 hp
Horsepower to Kilowatt chart
Common values from horsepower to kilowatts, rounded to four decimal places.
| Horsepower (hp) | Kilowatt (kW) |
|---|---|
| 0.25 | 0.1864 |
| 0.33 | 0.2461 |
| 0.5 | 0.3728 |
| 0.75 | 0.5593 |
| 1 | 0.7457 |
| 1.5 | 1.1185 |
| 2 | 1.4914 |
| 3 | 2.2371 |
| 5 | 3.7285 |
| 7.5 | 5.5927 |
| 10 | 7.457 |
| 15 | 11.1855 |
| 20 | 14.914 |
| 25 | 18.6425 |
| 50 | 37.285 |
| 75 | 55.9275 |
| 100 | 74.57 |
| 150 | 111.855 |
| 180 | 134.226 |
| 250 | 186.425 |
| 300 | 223.71 |
| 400 | 298.2799 |
| 500 | 372.8499 |
| 700 | 521.9899 |
| 1,000 | 745.6999 |
Kilowatt to Horsepower chart
The reverse direction for values people often look up.
| Kilowatt (kW) | Horsepower (hp) |
|---|---|
| 0.37 | 0.4962 |
| 0.55 | 0.7376 |
| 0.75 | 1.0058 |
| 1.1 | 1.4751 |
| 2.2 | 2.9502 |
| 4 | 5.3641 |
| 7.5 | 10.0577 |
| 11 | 14.7512 |
| 37 | 49.6178 |
| 55 | 73.7562 |
| 90 | 120.692 |
| 110 | 147.5124 |
| 160 | 214.5635 |
| 220 | 295.0249 |
Machines rated in horsepower
| Machine | Horsepower (hp) | Kilowatt (kW) |
|---|---|---|
| Garbage disposal, a common size | 0.5 | 0.3728 |
| Garage door opener, a common rating | 0.75 | 0.5593 |
| One horsepower as James Watt defined it | 1 | 0.7457 |
| Residential pool pump, a common size | 1.5 | 1.1185 |
| Ford Model T engine (1908) | 20 | 14.914 |
| GE Evolution Series freight locomotive | 4,400 | 3,281.08 |
Quick mental estimate
Take three quarters: 200 hp → 150 kW. The factor 0.75 is about 0.6% above the exact 0.7457, so a 200 hp engine is really just over 149 kW.
Use the converter or the charts when the exact figure matters.
The two units
Horsepower (hp): The mechanical horsepower selected here is exactly 550 foot-pounds-force per second, about 745.700 W. The bhp alias uses this mechanical unit; brake power describes a measurement of output, while other horsepower definitions, such as metric PS, have different values.
Kilowatt (kW): A kilowatt (kW) is 1,000 watts. Electric heaters, EV chargers, solar inverters and car engines outside the US are rated in kW.
Frequently asked questions
How many kW is 100 hp?
100 hp is about 74.6 kW. In the other direction, a 100 kW electric motor comes to about 134 hp.
Is bhp different from hp?
Brake horsepower describes how the power was measured, at the engine's output shaft before drivetrain losses, rather than a different unit size. In the US, bhp figures use the same 745.7 W horsepower as this page.
Why do European cars list PS instead of hp?
PS (Pferdestärke) is the German name for the metric horsepower, 75 kilogram-force meters per second. EU registration papers give the official rating in kW, and PS is a traditional figure printed alongside it.
How precise is the result?
The converter uses the exact definitions above with browser floating-point arithmetic and shows up to 12 significant digits. The charts round to four decimal places for reading.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/horsepower-to-kilowatt-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Horsepower to Kilowatts Converter (hp to kW). https://kakao.mobile/tools/horsepower-to-kilowatt-converter/
“Horsepower to Kilowatts Converter (hp to kW).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/horsepower-to-kilowatt-converter/.
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