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Answer by maber (1427) It depends on the type of paint you have and if your walls are textured or not. But a general estimate that could help would be that if you have non textured walls and regular semi gloss paint, a gallon will cover 250 square feet.
You end up with a number that is close to the actual wall area you have to cover with paint. 1  In general, you can expect 1 gallon of paint to cover about 350 square feet. You need slightly more than a gallon if the walls are unpainted drywall, which absorbs more of the paint. You also need to consider whether to paint more than one coat.