Tile & Flooring Calculator
How many tiles — and boxes — to cover a floor or wall, with a waste allowance.
Leave blank to skip the box count.
- Bare need is 100.0 tiles; 110 includes ~10% for cuts, breakage, and future repairs (a typical over-order — not a code value).
- Area is gross (length × width). Order a little extra of the same dye lot; colors can differ between production runs.
How the tile estimate works
Tiles needed is the area to cover divided by the area of one tile. Enter the tile's actual size (e.g. 12 × 12 in, or 300 × 600 mm) and the room's length and width; the calculator handles the unit conversion and rounds up to whole tiles.
The waste allowance covers cuts at walls, breakage, and a few spares — 10% is typical, more for diagonal or patterned layouts. If you enter tiles per box, you also get the number of boxes, rounded up. Waste and dye-lot advice are rules of thumb, not code values.
Frequently asked questions
How many tiles do I need?
Divide the area you're covering by the area of one tile, then add a waste allowance. A 100 sq ft floor with 12 × 12 in tiles (1 sq ft each) needs 100 tiles bare, or about 110 with 10% waste for cuts and breakage.
How much waste should I add for tile?
About 10% for a straight layout, and 15% or more for diagonal or patterned layouts and busy rooms with lots of cuts. Buy the extra in the same dye lot up front — colors can differ between production runs, and you'll want spares for future repairs.
How many boxes of tile is that?
Enter the tiles-per-box printed on the carton and the calculator divides your total (including waste) by it and rounds up. Tile is sold by the full box, so always round up.