BTU per hour rates heating and cooling output; watts is the SI power unit. One BTU/hr equals about 0.293 watts — useful for sizing heaters, AC units and appliances.
Heat & cool
Rated for your room.
Portable air conditioner
Match BTU to room size.
Electric space heater
Watt-rated heating.
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Frequently asked questions
How many watts is 1 BTU/hr?
One BTU per hour equals 0.293071 watts.
How many BTU is 1000 watts?
About 3,412 BTU per hour.