Where to find coverage on the can
Look for "Coverage" or "Spread rate" — typically 250–400 sq ft per gallon for interior latex, lower for rough surfaces and exterior stain.
That number assumes one coat on a smooth, properly prepared surface. Multiply your total area by coat count before dividing.
Factors that reduce coverage
Our calculator includes a waste allowance you can adjust. Ten percent is standard for walls; fifteen percent for complex rooms with many corners.
- Textured walls (orange peel, knockdown)
- Unprimed porous surfaces (new drywall, bare wood)
- Rolling vs spraying (spray often uses more product)
- Deep colors requiring thick application
- Cutting in waste and tray residue — add 10% buffer