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Convert power between watts, kilowatts, horsepower, and BTU/hr.
All Conversions
Power Conversion:
Target = Input x (Source Watt Factor / Target Watt Factor)
The watt (W) is the SI base unit of power, equal to 1 joule per second.
1 mechanical horsepower = 745.7 watts. 1 metric horsepower = 735.5 watts. This calculator uses mechanical horsepower.
Power is the rate of energy transfer (watts = joules/second). Energy is the total amount transferred (kWh). A 100W bulb running for 10 hours uses 1 kWh of energy.
A typical US home uses an average of about 1.25 kW continuously, peaking at 5-10 kW during high-demand periods (ovens, air conditioning, etc.).
BTU/hr measures heating and cooling power for HVAC equipment. A typical window air conditioner is rated at 5,000-12,000 BTU/hr.
1 MW = 1,000 kW = 1,000,000 W. A megawatt can power roughly 400-900 average US homes for a year.