Power Converter (W, kW, hp, PS, BTU/h)
Convert power between watts, kilowatts, horsepower, and BTU/hour — useful for comparing engine, appliance, and HVAC specs across regions. Runs entirely in your browser.
How it works
Every unit is converted through a common base unit — the watt. Mechanical horsepower (used in the US/UK, 745.7 W) and metric horsepower — "PS", Pferdestärke — (used across continental Europe and Japan, 735.5 W) are close but not identical, so a car advertised at "150 PS" is not quite 150 hp.
Common conversions
| From | To | Result |
|---|---|---|
| 100 kW | hp | 134.10 hp |
| 150 PS | hp | 147.94 hp |
| 1 hp | W | 745.70 W |
| 1 kW | BTU/h | 3412.14 BTU/h |
FAQ
Is PS the same as horsepower?
Close but not exact: 1 PS = 735.5 W, 1 hp (mechanical) = 745.7 W — 1 PS is about 98.6% of 1 hp.
How many watts is 1 horsepower?
1 mechanical horsepower = 745.6998715822702 W (defined exactly by this conversion factor).