What does this tool do?
Ceiling area is length times width, repeated for each room of the same size. Paint coverage and the number of coats then determine how much product to buy, while tiles are counted by area.
The Formula
Area = length × width × rooms; paint = area × coats ÷ coverage; tiles = areaFrequently Asked Questions
How many coats of ceiling paint?
Two coats usually give an even finish, especially when changing colour or covering patches. A tinted primer can reduce the number of finish coats.
How much tile waste should I add?
Buy 10% extra for cuts and breakage, and keep a few spares. Patterns and border tiles can need more.