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Tiles and boxes for any floor, waste included.
Enter your floor's length and width and pick your tile size to see how many tiles the job needs. The calculator adds a 10% waste allowance for cuts and breakage, and converts the total into boxes of 10 tiles. Bigger tiles mean fewer pieces but more waste on awkward layouts.
Tile quantities start from floor area divided by tile area, then get padded for the realities of cutting. A 12x12 inch tile covers exactly 1 square foot; a 6x6 covers 0.25 sq ft; a 12x24 covers 2 sq ft. But rooms are not multiples of tile sizes, so edge cuts consume extra tiles — the industry rule is 10 percent waste for straight layouts and 15 percent for diagonal or complex patterns, where every perimeter cut wastes half a tile. Intricate mosaics and large-format tiles (24x24 and up) push waste higher because a single bad cut ruins a large, expensive tile.
Tiles are sold by the box with coverage printed on it (often 10 to 15 sq ft per box), so convert your padded area into boxes and round up — a half-empty box is useless if the dye lot sells out later. Grout joints (typically 1/8 to 1/4 inch) barely change the tile count for an estimate; the waste allowance swallows the difference. For walls, measure each wall's area separately and add them; for floors with fixtures, subtract large permanent features like a bathtub footprint but not small ones like a toilet flange.
Buy all tiles from the same dye lot (the code on the box) — shade varies between production runs, and mixed lots show banding on the finished floor. Keep a box of spares after the job: manufacturers discontinue lines constantly, and future repairs without matching tile mean retiling the whole area.
Tiles = ceil(floor area ÷ tile area × 1.1) for a 10% waste allowance. Boxes = ceil(tiles ÷ 10), assuming 10 tiles per box.
Each tile covers 1 sq ft, so the base count is 120 / 1 = 120 tiles. Straight layout waste at 10 percent: 120 x 1.10 = 132 tiles. If boxes hold 12 tiles (12 sq ft per box): 132 / 12 = 11 boxes exactly. Diagonal layout at 15 percent: 120 x 1.15 = 138 tiles, or 11.5 boxes — round up to 12 boxes. The diagonal pattern costs one extra box here, which is typical: pattern upgrades are paid for in waste, and the calculator makes that cost visible before you commit.
Each tile covers 0.25 sq ft: 120 / 0.25 = 480 tiles base. With 15 percent waste for the busier grout lines and more cuts: 480 x 1.15 = 552 tiles. Boxes of 24 (6 sq ft per box): 552 / 24 = 23 boxes. Smaller tiles mean dramatically more pieces and more grout — 552 tiles versus 132 — which is why small-format tile costs more in labor even though the material math is identical. For a herringbone or Versailles pattern, push waste to 20 percent: 480 x 1.20 = 576 tiles, or 24 boxes.
Yes — 10% is the industry standard for straight layouts. Diagonal patterns or rooms with many corners and doorways may need 15% instead.
Divide the floor area by one tile's area, then add your waste allowance. A 12 m² floor with 30 cm tiles needs 133.33 tiles, plus 10% = 147 tiles.
Most stores pack 8–12 tiles per box depending on tile size. This calculator uses 10 per box as a common standard — check your supplier's box quantity before ordering.