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Power Converter

Convert between 7 power units: watts, kilowatts, megawatts, horsepower, metric PS and BTU per hour, with live results and the formula shown.

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How power conversion works

All units convert through watts, the SI unit (one joule per second). Each unit has one fixed factor (1 hp = 745.7 W), so any pair converts in a single step.

Horsepower vs metric PS

Mechanical horsepower (745.7 W) is the imperial definition; metric PS or CV (735.5 W) is used for European car specs. They differ by about 1.4%, so 100 PS is roughly 98.6 hp.

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Power Converter FAQs

How many watts in 1 horsepower?
745.7 W for mechanical horsepower; 735.5 W for metric PS.
How many kW is 100 hp?
74.57 kW (mechanical hp).
What is BTU/h used for?
Air conditioner and heater capacity. 12,000 BTU/h = 1 ton of cooling = about 3.52 kW.
Power vs energy?
Power is the rate (watts); energy is power over time (watt-hours). A 1 kW heater running 1 hour uses 1 kWh.
How many watts is 1 kW?
1,000 watts exactly.
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