Square footage estimator
Enter room dimensions to get wall and ceiling area and the gallons you'll need — then price it in the cost calculator.
Openings are approximate (21 sq ft/door, 15 sq ft/window). Measure large openings for precision.
Questions
How do I calculate the square footage of a wall to paint?
Multiply the room's perimeter by the wall height: 2 × (length + width) × height. For a 12 × 10 room with 8-foot walls that's 2 × 22 × 8 = 352 square feet before subtracting doors and windows.
Should I subtract doors and windows?
For a tighter estimate, yes. This tool subtracts about 21 sq ft per door and 15 sq ft per window. On small jobs many painters skip it and paint the extra as buffer.
How much paint do I need for a room?
Divide the total paintable area by the paint's coverage (about 350 sq ft/gallon) and multiply by the number of coats. Most single rooms need 1–2 gallons for two coats of wall paint.
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