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Paint Calculator

How many gallons to paint a room — walls, coats, doors, and windows included.

About 20 sq ft each
About 15 sq ft each
Check your paint can (often 250–400)

Wall area = 2 × (length + width) × height, minus doors and windows, times the number of coats. Textured, porous, or dark-to-light walls can need more — buy a little extra for touch-ups.