Power Converter
Convert between watt, kilowatt, megawatt, horsepower and BTU per hour instantly.
Standard power units
Fun comparisons
Power conversion is essential for comparing car engines, sizing air conditioners, understanding electricity bills and rating industrial equipment. Watts and kilowatts are the SI standard, while horsepower remains dominant in automotive and mechanical engineering. BTU per hour is used for heating and cooling system ratings in the US. Our converter covers all 20 unit pairs with real-world comparisons like microwave ovens and car engines.
Frequently asked questions
To convert kilowatts to horsepower, multiply by 1.341. For example, a 150 kW engine produces approximately 201 horsepower. European car specs typically list kW while US specs use hp.
1500 watts equals 1.5 kilowatts. If a 1500 W heater runs for 1 hour it uses 1.5 kWh. At a typical rate of $0.15 per kWh, that costs about $0.23 per hour to run.
To convert BTU/h to kilowatts, divide by 3412.14. A 12000 BTU/h window AC unit equals approximately 3.52 kW. A 24000 BTU/h unit equals about 7.03 kW.
100 horsepower equals approximately 74,570 watts (74.57 kW). This is based on mechanical horsepower (1 hp = 745.7 W), the most common definition used for engines and motors.
Power is the rate of energy transfer, measured in watts (joules per second). Energy is the total amount of work done, measured in joules or kilowatt-hours. A 100 W bulb running for 10 hours uses 1 kWh of energy.
All power conversions
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