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The total cost for painting an interior will run about $1.02 per square foot (about $390 for the for a 12x12 room) of wall space being painted.
Estimate the amount of paint, with a gallon of primer, or base paint, covering 330 square feet and a gallon of other paint providing coverage up to 350 square feet. 1  The composition of base paint is different, which is why it covers fewer square feet per gallon.2  Paint costs can range from $15 to $60 per gallon.. Figure the cost per square foot of a professional's flat fee by dividing the cost by the square footage. 1  For example, an $800 estimate for 1,500 square feet would be 800 divided by 1,500 which is equal to a 53.3 cent cost per square foot.