Value, From, To
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How this calculator works
Power is the rate at which energy is used or produced; one watt is one joule per second. Car engines are quoted in horsepower in the United States and United Kingdom, in metric horsepower (PS or CV) in much of Europe and Asia, and increasingly in kilowatts. Air conditioners and furnaces are rated in BTU per hour.
Formula
- 1 hp (mechanical) = 745.7 W
- 1 PS (metric horsepower) = 735.49875 W
- 1 kW = 1.341 hp = 1.3596 PS
- 1 BTU/h = 0.29307 W
Worked example
100 hp to kw
- Value
- 100
- From
- Mechanical horsepower (hp)
- To
- Kilowatt (kW)
Result74.569987 kW
100 hp = 74.569987 kW. 1 hp = 0.74569987 kW.
Frequently asked questions
How many kW is 100 horsepower?
100 mechanical horsepower is about 74.57 kW. 100 metric horsepower (PS) is about 73.55 kW.
What is the difference between hp and PS?
Mechanical horsepower is 745.7 W and metric horsepower is 735.5 W, so 1 hp is about 1.014 PS.
How do I convert BTU per hour to watts?
Multiply by 0.29307. A 12,000 BTU/h air conditioner moves about 3,517 W of heat.
Sources
More in Unit Converters
Results are estimates based on the values you enter and the published method shown above. They do not replace professional medical, financial or legal advice. Method reviewed October 7, 2026. About this site