Convert Horsepower to Kilowatts
1 horsepower is 0.7457 kW. One horsepower is exactly 0.745699871582 kilowatts.
One horsepower is 0.74569987 kilowatts. To convert horsepower to kilowatts, multiply by 0.74569987; to go the other way, divide by 0.74569987 or multiply by 1.3410221. The factor is exact rather than rounded: it follows from NIST Special Publication 811. Mechanical horsepower: exactly 550 foot-pounds of work every second, the figure James Watt settled on to sell engines against pit ponies.
Factor checked against the defining standard · How we check
- Horsepower × 0.74569987
value * 0.7456998715820.746 kW
1 horsepower in every power unit
| Unit | Value | Exact factor |
|---|---|---|
| horsepower (as entered) | 1 hp | — |
| metric horsepower | 1.013869665 PS | × 1.01386966542 |
| watts | 745.6998716 W | × 745.699871582 |
| kilowatts | 0.7456998716 kW | × 0.745699871582 |
| megawatts | 0.0007456998716 MW | × 0.000745699871582 |
| BTU per hour | 2,544.433578 BTU/h | × 2,544.43357764 |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert horsepower to kilowatts?
- 1.Take the measurement in horsepower.
- 2.Multiply by 0.74569987 — that is how many kilowatts fit in one horsepower.
- 3.To go back the other way, divide by 0.74569987, or multiply by 1.3410221.
Worked example: 25 horsepower to kilowatts
- Formula
- hp × 0.74569987 = kW
- Arithmetic
- 25 × 0.74569987 = 18.642497 kW
- Answer
- 25 hp = 18.642497 kW
The factor is rounded for display; the figure above is computed from the full value.
Horsepower to kilowatts conversion table
| Horsepower | Kilowatts |
|---|---|
| 1 hp | 0.7457 kW |
| 2 hp | 1.4914 kW |
| 3 hp | 2.2371 kW |
| 4 hp | 2.982799 kW |
| 5 hp | 3.728499 kW |
| 6 hp | 4.474199 kW |
| 7 hp | 5.219899 kW |
| 8 hp | 5.965599 kW |
| 9 hp | 6.711299 kW |
| 10 hp | 7.456999 kW |
| 12 hp | 8.948398 kW |
| 15 hp | 11.185498 kW |
| 20 hp | 14.913997 kW |
| 25 hp | 18.642497 kW |
| 50 hp | 37.284994 kW |
| 100 hp | 74.569987 kW |
| 200 hp | 149.139974 kW |
| 300 hp | 223.709961 kW |
| 500 hp | 372.849936 kW |
| 1000 hp | 745.699872 kW |
| 2000 hp | 1,491.399743 kW |
| 5000 hp | 3,728.499358 kW |
| 10000 hp | 7,456.998716 kW |
What is a horsepower?
Mechanical horsepower: exactly 550 foot-pounds of work every second, the figure James Watt settled on to sell engines against pit ponies. US vehicle and motor ratings use it.
What is a kilowatt?
A thousand watts. Electric motors, kettles and EV chargers are rated here, and a kilowatt is close to 1.34 horsepower.
How many kilowatts are in a horsepower?
One horsepower is 0.74569987 kilowatts. Going the other way, one kilowatt is 1.3410221 horsepower. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every power unit here
| Unit | Symbol | One of these is |
|---|---|---|
| Horsepower | hp | 745.69987 watt |
| Metric horsepower | PS | 735.49875 watt |
| Watts | W | the base unit |
| Kilowatts | kW | 1000 watt |
| Megawatts | MW | 1000000 watt |
| BTU per hour | BTU/h | 0.29307107 watt |
Source: NIST Special Publication 811 — mechanical horsepower is 550 ft·lbf/s exactly
Questions people actually ask
- How many kilowatts are in a horsepower?
- 0.74569987. A thousand watts. Electric motors, kettles and EV chargers are rated here, and a kilowatt is close to 1.34 horsepower.
- How do I convert kilowatts back to horsepower?
- Divide by 0.74569987, or multiply by 1.3410221 — they are the same operation.
Other power conversions
Kilowatts to horsepower — the same conversion the other way.