Watts to PS (Metric Horsepower) Converter
Convert watts to metric horsepower — one PS is 735.5 watts. Results update as you type; exact factors shown.
One watt is 0.0014 metric horsepower (PS) — see the exact factor, not a rounded rule of thumb.
How the watts to ps (metric horsepower) 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 US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common power conversions
| From | To | Units |
|---|---|---|
| 735.5 W | 1 PS | watts to metric horsepower (PS) |
| 1,000 W | 1.3596 PS | watts to metric horsepower (PS) |
| 5,000 W | 6.7981 PS | watts to metric horsepower (PS) |
| 10,000 W | 13.5962 PS | watts to metric horsepower (PS) |
| 50,000 W | 67.9811 PS | watts to metric horsepower (PS) |
| 75,000 W | 101.9716 PS | watts to metric horsepower (PS) |
| 100,000 W | 135.9622 PS | watts to metric horsepower (PS) |
| 110,000 W | 149.5584 PS | watts to metric horsepower (PS) |
| 150,000 W | 203.9432 PS | watts to metric horsepower (PS) |
| 200,000 W | 271.9243 PS | watts to metric horsepower (PS) |
| 250,000 W | 339.9054 PS | watts to metric horsepower (PS) |
| 500,000 W | 679.8108 PS | watts to metric horsepower (PS) |
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
What is PS?
Pferdestärke, metric horsepower — 735.5 W, used across European car specifications.
How is it different from hp?
Mechanical horsepower is 745.7 W, so PS figures read about 1.4% higher for the same engine.
What is 100,000 W in PS?
136 PS.
Why do German cars quote PS?
It is the traditional continental unit; the same car is often listed in kW and PS together.
What is 1 PS in hp?
0.9863 hp.
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 Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.