Multiply the length of each wall (corner to corner) by the height of the wall (floor to ceiling) and then add them together. Divide the total by 400 to get the quantity of paint needed per coat. Divide total by 300 for textured or rough surfaces. Deduct the measurements for windows and doors from your wall total when estimating how much wall paint is needed. For ceiling and floor, multiply the length by the width and divide the total by 400 to get the quantity needed.
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