HOW IT WORKS
The calculation
Net wall area × coats ÷ coverage per gallon = estimated gallons. Whole-gallon purchasing rounds that quantity up.
Painting
Paint Calculator
Estimate paint for rectangular walls, subtract doors and windows, and plan for multiple coats. Check the label for the coverage of your exact paint.
Keep in mind
Paint coverage varies by product and surface. This estimate covers one rectangular wall; check the label and account for other surfaces separately.
COMMON QUESTIONS
About paint estimates
How many coats of paint should I plan for?
Two coats are common, but coverage depends on color change, surface condition, primer, and the product. Follow the paint manufacturer’s instructions.
Does the calculator include ceilings and trim?
No. Add each wall area to the dimensions and openings inputs as appropriate; ceilings, trim, and unusual surfaces need separate estimates.
Want to understand the assumptions? Read the paint estimating guide →