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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.
Repeat for each wall, and then add the numbers together to get the total square footage of wall space. A gallon of paint will typically cover 300 to 400 square feet and prices range from $20 to $50 per gallon at the time of publication. A typical 10-by-10 room has 320 square feet of wall space, so you'd need 1 or 2 gallons of paint -- costing $40 to $100. Painting Supplies.