Paint Calculator
Buy the right amount of paint the first time. Enter your room dimensions, doors, windows and coats to get the paint needed.
How it works
- 1
Enter room dimensions
Length, width and wall height.
- 2
Subtract doors and windows
Their area is removed from the wall area.
- 3
Set number of coats
Most walls need two coats for even coverage.
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Frequently asked questions
Two coats is standard for most walls; a big color change may need three.
How paint quantity is calculated
Wall area is the room perimeter × wall height, minus the area of doors and windows. That area is then divided by your paint’s coverage rate and multiplied by the number of coats.
Coverage varies by paint and surface — check the label for the exact rate. Buying a little extra is wise for touch-ups later, since matching a color exactly after the can is empty can be difficult.