Convert Horsepower to Metric Horsepower
1 horsepower (hp) equals 1.013869665 metric horsepower (PS).
1 hp = 1.013869665 PS
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk horsepower to metric horsepower converter to paste a column from Excel.
How to Convert Horsepower to Metric Horsepower
- 1 hp = 1.013869665 PS
- 1 PS = 0.9863200706 hp
- Example: convert 15 hp to PS: 15 hp = 15 × 1.013869665 PS = 15.20804498 PS
Reference conditions. hp: Mechanical (imperial) horsepower, 550 ft·lbf/s. Metric horsepower (PS) is about 1.4 % smaller.
Formula
PS = hp × 1.013869665424
Derivation from SI units:
- 1 hp = 550 ft·lbf/s = 745.69987158227 W
- 1 PS = 75 kgf·m/s = 735.49875 W (exact)
- 1 hp = 745.6998715823 W ÷ 735.49875 W per PS = 1.013869665424 PS
Both units are defined exactly, so the factor is exact. Horsepower definition: horsepower; Metric Horsepower definition: metric horsepower.
Worked examples
- A 200 hp engine is 202.7739331 PS.
200 hp × 1.013869665 = 202.7739331 PS - A 500 hp engine is 506.9348327 PS.
500 hp × 1.013869665 = 506.9348327 PS
Horsepower to Metric Horsepower conversion table
| Horsepower (hp) | Metric Horsepower (PS) |
|---|---|
| 0.25 hp | 0.2534674164 PS |
| 0.5 hp | 0.5069348327 PS |
| 1 hp | 1.013869665 PS |
| 1.5 hp | 1.520804498 PS |
| 2 hp | 2.027739331 PS |
| 5 hp | 5.069348327 PS |
| 10 hp | 10.13869665 PS |
| 25 hp | 25.34674164 PS |
| 50 hp | 50.69348327 PS |
| 100 hp | 101.3869665 PS |
| 150 hp | 152.0804498 PS |
| 200 hp | 202.7739331 PS |
| 300 hp | 304.1608996 PS |
| 400 hp | 405.5478662 PS |
| 500 hp | 506.9348327 PS |
| 1000 hp | 1013.869665 PS |
Where it's used
US horsepower ratings are converted to PS for European comparisons; 1 hp is about 1.014 PS.
Horsepower to other power units
| Conversion | 1 hp equals |
|---|---|
| horsepower to watt | 745.6998716 W |
| horsepower to milliwatt | 745699.8716 mW |
| horsepower to kilowatt | 0.7456998716 kW |
| horsepower to megawatt | 0.0007456998716 MW |
| horsepower to metric horsepower | 1.013869665 PS |
| horsepower to BTU per hour | 2544.433578 BTU/h |
| horsepower to refrigeration ton | 0.2120361315 TR |
| horsepower to kilocalorie per hour | 641.186476 kcal/h |
| horsepower to foot-pound per second | 550 ft·lbf/s |
Frequently asked questions
How many PS is 1 hp?
1 hp = 1.01387 PS.
How many metric horsepower are in 1 horsepower?
1 hp = 1.013869665 PS.
How do I convert horsepower to metric horsepower?
Multiply the value in hp by 1.013869665. For example, 15 hp × 1.013869665 = 15.20804498 PS.
Is the hp to PS conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "horsepower (550 ft·lbf/s)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "horsepower (metric)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Horsepower to Metric Horsepower. Retrieved October 17, 2026, from https://scientificconverters.com/power/horsepower-to-metric-horsepower/
IEEE
Scientific Converters, "Convert Horsepower to Metric Horsepower," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/power/horsepower-to-metric-horsepower/