Tile and paint calculator
Work out how many tiles and how much wall paint you need for a room, with waste and windows.
Tiles
About 10, diagonal 15
Wall paint
All wall lengths added up
Area that is not painted
Ceiling area, otherwise 0
On the tin, often 6–8
How the calculator works
Tiles: the area is increased by the waste, divided by the area of one tile and rounded up. For straight laying, 10 % waste is usually enough; for diagonal laying or many corners, rather 15 %.
Paint: the wall area is the room perimeter times the room height, minus windows and doors, plus the ceiling if you like. Times the number of coats, divided by the coverage, gives the litres. Plan some reserve, especially on absorbent surfaces.
Results are guide values for planning and do not replace professional planning or measuring on site.