PS to HP Converter
Convert metric horsepower (PS) to mechanical horsepower — multiply by 0.9863. Results update as you type; exact factors shown.
One metric horsepower (PS) is 0.9863 horsepower (mechanical) — see the exact factor, not a rounded rule of thumb.
How the ps to hp converter works
Power converts through the watt. Mechanical horsepower is 550 ft·lbf/s = 745.6999 W; metric horsepower (PS, used in European car specs) is 735.4988 W. Air-conditioner capacities are quoted in kW, BTU/h (1 W = 3.412 BTU/h) or tons of refrigeration (3.517 kW).
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common power conversions
| From | To | Units |
|---|---|---|
| 50 PS | 49.316 hp | metric horsepower (PS) to horsepower (mechanical) |
| 75 PS | 73.974 hp | metric horsepower (PS) to horsepower (mechanical) |
| 100 PS | 98.632 hp | metric horsepower (PS) to horsepower (mechanical) |
| 125 PS | 123.29 hp | metric horsepower (PS) to horsepower (mechanical) |
| 150 PS | 147.948 hp | metric horsepower (PS) to horsepower (mechanical) |
| 200 PS | 197.264 hp | metric horsepower (PS) to horsepower (mechanical) |
| 250 PS | 246.58 hp | metric horsepower (PS) to horsepower (mechanical) |
| 300 PS | 295.896 hp | metric horsepower (PS) to horsepower (mechanical) |
| 400 PS | 394.528 hp | metric horsepower (PS) to horsepower (mechanical) |
| 500 PS | 493.16 hp | metric horsepower (PS) to horsepower (mechanical) |
| 700 PS | 690.424 hp | metric horsepower (PS) to horsepower (mechanical) |
| 1,000 PS | 986.3201 hp | metric horsepower (PS) to horsepower (mechanical) |
Units in this converter and their exact factors
| Unit | Symbol | One unit in watts |
|---|---|---|
| watt | W | 1 watt |
| kilowatt | kW | 1,000 watt |
| megawatt | MW | 1,000,000 watt |
| horsepower (mechanical) | hp | 745.6998715823 watt |
| metric horsepower (PS) | PS | 735.49875 watt |
| BTU per hour | BTU/h | 0.29307107 watt |
| ton of refrigeration | TR | 3,516.8528421 watt |
FAQFrequently asked questions about power conversion
How many hp is 300 PS?
295.9 hp.
Why are there two horsepowers?
Watt defined the original from a horse lifting 550 foot-pounds a second; continental Europe defined its own from 75 kilogram-metres a second. They differ by 1.4%.
Which is used where?
PS in Germany, Japan and much of Europe; hp in the US and UK; kW everywhere official.
What is 1 PS in watts?
735.5 W.
Does the difference matter?
Only for comparing quoted figures — a car advertised at 300 PS in Germany is 296 hp in a US review.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.