Find the gallons of paint needed to cover your wall area for the number of coats you plan.
Surface to be painted in square feet (length × height minus openings).
Number of coats you plan to apply. Two coats doubles the raw quantity.
Coverage per gallon or liter printed on the can — e.g., 350 sq ft/gal.
Gallons to Buy
3
Gallons needed after accounting for coats — round up to whole cans.
Gallons (Exact)
2.29
Raw computed quantity before rounding.
What this means
Raw material estimate before waste and texture. Round up to the next whole can; buy 10% extra for rollers/texture.
Estimate paint needed by dividing the total coated area (wall area × coats) by the coverage of one gallon, then rounding up because paint is sold by the whole gallon.
Formula
gallons = ceil((area × coats) ÷ coverage)
Worked examples
FAQ
Should I buy extra paint?
Rounding up to whole gallons already covers waste; add a can for touch-ups if you expect to repaint.
What if my ceiling has a different coverage?
Coverage depends on surface; adjust the coverage field to match your paint’s label.