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For a relatively smooth surface, like old paint in good condition, or primed wood, it generally takes about 1 gallon per each 400 square feet. Thus, measure the space to be painted and calculate the area in square feet. Divide the area by 400 to get the number of gallons per coat. Rough surfaces like stucco will take much more paint, and one gallon may do only 200 square feet, so use 200 sq. ft./gallon for this type surface.
Ad. 2. 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.igure 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. 2  4 Edit step.