It depends . . . check the back of the paint can -- it should tell. If not, figure 350 to 400 square feet per gallon on smoothish surfaces and perhaps 200 square feet on roughish surfaces.
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1.6042 square feet (rounded)
4.55 litres
A gallon is a measure of volume whereas a square foot is a measure of area. So there are no gallons in a square foot and no square feet in a gallon.
Paint coverage differs depending on brand and type of paint. Most (if not all) paint cans will indicate that one gallon covers so many square feet. For example, Paint A says one gallon covers 200 square feet. That means 200 square feet will require one gallon, 50 square feet will require one quart, 400 square feet will require two gallons, etc.
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