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Paint Coverage Calculator

Estimate how many gallons of paint you need for a room based on wall dimensions, openings, and number of coats.

Wall Length (ft)

Wall Height (ft)

Number of Walls

Total Doors + Windows Area (sq ft)

Number of Coats

Coverage per Gallon (sq ft)

Limitations: Coverage varies by paint brand and surface. Porous new drywall can consume 30–50% more primer coat. Textured walls use more paint. Standard flat latex: ~350 sq ft/gal.

What to do next: Write down the brand's actual sq ft/gal rating from the can. Buy one extra gallon for touch-ups — partially used cans last 1–2 years if sealed well.

Coverage varies by paint type, surface texture, and application technique. Use as a planning estimate — check the can for your paint brand's actual sq ft/gal rating.