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Paint calculator
How many gallons of paint and primer a room needs.
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How this works
Wall area is the room perimeter times height, minus about 20 sq ft per door and 15 sq ft per window. Gallons equal paintable area times coats divided by the coverage on the can (usually 350 to 400 sq ft per gallon).
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Related guide
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Compare interior paint, specialty wall finishes, and professional surface preparation for durable, well-finished rooms.