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Gallons of wall, ceiling and trim paint, primer and supplies for a room, a whole interior or a house exterior. Doors and windows subtracted, coats and coverage shown.
Coverage depends on the surface. Use the lower number on rough, porous or unprimed surfaces.
Ranges come from typical manufacturer labels. Check your can for its rated coverage.
Walls only, 8 ft ceilings, one door and two windows, two coats at 350 sq ft per gallon.
Rounded up to whole gallons (quart for small ceilings). Trim is extra.
Higher sheen is tougher and easier to clean but shows every dent and patch.
Exterior: satin for siding is the most common choice; semi-gloss for trim and doors.
Measure the perimeter, multiply by wall height, subtract about 21 sq ft per door and 15 sq ft per window, then divide by 350–400 sq ft per gallon and multiply by the number of coats. A 12 × 14 ft room with 8 ft ceilings needs about 2 gallons for two coats on the walls.
Most labels say 250–400 sq ft per gallon per coat on smooth, primed walls. Textured, porous or exterior surfaces get less: about 200–300.
Usually yes when changing color, and always over new drywall after primer. A same-color refresh with good paint can often be done in one coat.
On bare drywall, patched areas, stains, glossy surfaces and big color changes, especially dark to light. Paint-and-primer products help but don't replace a primer on bare surfaces.
Multiply the perimeter by wall height, add the gable ends, subtract doors and windows, then divide by about 250–350 sq ft per gallon per coat. A 1,500 sq ft single-story house often needs 10–15 gallons for two coats.
Usually, once you need 4 gallons or more of the same color. The calculator switches to buckets automatically when it saves money.
Interior painting commonly runs about $1.50–$3.50 per sq ft of wall, and exterior about $1.50–$4 per sq ft of surface, including labor and paint. Prep, height and trim detail move the price.
Flat for ceilings, eggshell or satin for walls, semi-gloss for trim, doors and bathrooms. Higher sheens clean more easily but show wall flaws.