Paint calculator
Work out paint for the walls and ceiling of a room, or any surface, using the coverage on the can.
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How it is calculated
wall area = 2 × (length + width) × height − openings
paint = area × coats / coverage
Real coverage depends on the surface: new drywall absorbs more than a previously painted wall.
Frequently asked questions
How much paint for a 12 × 12 ft room?
With 8 ft walls and two coats, about 2 gallons for the walls.
How many coats of paint?
Usually two; three when going from a dark to a light color.