Power converter
Convert between watts, kW, hp, PS, BTU/h and kcal/h.
Power converter
Convert power between watts (W), kilowatts (kW), megawatts (MW), mechanical horsepower (hp), metric horsepower (PS), BTU per hour (BTU/h) and kcal per hour (kcal/h). Useful for engines, appliances, heating and air conditioning. It all runs in your browser.
Useful equivalents
1 hp (mechanical) ≈ 745.7 W. 1 PS (metric) ≈ 735.5 W. 1 kW ≈ 1.341 hp. 1 kW = 3,412 BTU/h. Air-con capacity is often quoted in BTU/h.
hp vs PS
Imperial “hp” (745.7 W) and metric “PS” / “cv” (735.5 W) differ by about 1.4%, which is why the same car can be listed with slightly different figures.
Frequently asked questions
How many watts is 1 hp? About 746 W (mechanical hp).
How many BTU/h in 1 kW? About 3,412 BTU/h.