Tile calculator for several walls and floors
Choose a wall or floor, enter its dimensions, then add the tile size, box area, grout joint and tile depth. Add as many separate areas as needed for a bathroom, kitchen splashback or whole floor.
How the tile estimate works
Tiles = surface area × waste allowance ÷ individual tile area. The result rounds up to complete tiles. Boxes are calculated from the square metres printed on each box and also rounded up.
How much extra tile should I allow?
Ten percent is a common allowance for ordinary straight-laid tiles and normal cuts. Patterned, diagonal or herringbone layouts often need about 15% or more. Difficult patterns, natural variation and future repairs can justify a larger allowance.
Grout estimator formula
The grout estimate uses tile length and width, joint width, tile depth and a representative density factor. Real use changes with grout density, tile edge profile, substrate and application, so check the grout bag or manufacturer calculator before purchasing.
Measuring wall tiles
Multiply wall width by wall height. Add each wall as a separate tiled area. If you are not tiling behind a bath, cabinet, door or window, split the wall into smaller rectangles and add only the sections that will be tiled.
Plan the rest of the project
View all free project calculators →
Frequently asked questions
Do I enter tile size in millimetres?
Yes. Tile width, height, joint and depth use millimetres, matching typical packaging.
Can I estimate wall and floor tiles together?
Yes. Add each surface separately and choose whether it is a floor or wall.
Why is the grout figure approximate?
Grout density, tile thickness, edge shape, joint consistency and installation technique all change real consumption.