Depends on the height of the room, how many windows and doors, if you use a primer, if it is bare sheet rock and how many coats. You need to be more specific.
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That would depend on the type of paint you want to use. Usually, the area coverage will be written on the label of the paint can. Approx. 400 sq feet is the coverage on a smooth surface using regular house paint, however, an elastomeric paint would only go approx 80 sq ft per gallon.
nope
36000
mabey 2,000,000
One quart of paint nominally covers about 100 square feet.