How Much Paint for a 12x12 Room
A 12×12 room with 8-foot ceilings, one door, and one window has about 348 sq ft of paintable wall. At 350 sq ft per gallon, that's ~1.0 gallon per coat and ~2.0 gallons for two coats. Round up and buy 3 gallons to include the 10% spare. Adjust ceiling height, doors, windows, and coats for your exact room.
Assumes 8-ft ceilings, 1 door, 1 window, 2 coats — adjust to match your room.
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