Convert Horsepower to Metric horsepower
1 horsepower is 1.01387 PS. One horsepower is exactly 1.01386966542 metric horsepower.
One horsepower is 1.0138697 metric horsepower. To convert horsepower to metric horsepower, multiply by 1.0138697; to go the other way, divide by 1.0138697 or multiply by 0.98632007. 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 × 1.0138697
value * 1.013869665421.014 PS
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 metric horsepower?
- 1.Take the measurement in horsepower.
- 2.Multiply by 1.0138697 — that is how many metric horsepower fit in one horsepower.
- 3.To go back the other way, divide by 1.0138697, or multiply by 0.98632007.
Worked example: 25 horsepower to metric horsepower
- Formula
- hp × 1.0138697 = PS
- Arithmetic
- 25 × 1.0138697 = 25.346742 PS
- Answer
- 25 hp = 25.346742 PS
The factor is rounded for display; the figure above is computed from the full value.
Horsepower to metric horsepower conversion table
| Horsepower | Metric horsepower |
|---|---|
| 1 hp | 1.01387 PS |
| 2 hp | 2.027739 PS |
| 3 hp | 3.041609 PS |
| 4 hp | 4.055479 PS |
| 5 hp | 5.069348 PS |
| 6 hp | 6.083218 PS |
| 7 hp | 7.097088 PS |
| 8 hp | 8.110957 PS |
| 9 hp | 9.124827 PS |
| 10 hp | 10.138697 PS |
| 12 hp | 12.166436 PS |
| 15 hp | 15.208045 PS |
| 20 hp | 20.277393 PS |
| 25 hp | 25.346742 PS |
| 50 hp | 50.693483 PS |
| 100 hp | 101.386967 PS |
| 200 hp | 202.773933 PS |
| 300 hp | 304.1609 PS |
| 500 hp | 506.934833 PS |
| 1000 hp | 1,013.869665 PS |
| 2000 hp | 2,027.739331 PS |
| 5000 hp | 5,069.348327 PS |
| 10000 hp | 10,138.696654 PS |
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 metric horsepower?
Exactly 75 kilogram-force metres a second, which is 1.4% less than mechanical horsepower. A German car quoted at 150 PS is 148 hp, and the difference is the definition rather than the engine.
How many metric horsepower are in a horsepower?
One horsepower is 1.0138697 metric horsepower. Going the other way, one metric horsepower is 0.98632007 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 metric horsepower are in a horsepower?
- 1.0138697. Exactly 75 kilogram-force metres a second, which is 1.4% less than mechanical horsepower. A German car quoted at 150 PS is 148 hp, and the difference is the definition rather than the engine.
- How do I convert metric horsepower back to horsepower?
- Divide by 1.0138697, or multiply by 0.98632007 — they are the same operation.
Other power conversions
Metric horsepower to horsepower — the same conversion the other way.