Tile Calculator
This tile calculator turns your area's length and width, tile size, and waste allowance into exactly how many tiles and boxes to buy — 10% waste for straight layouts, 15% for diagonal or patterned.
Your project
Your materials
Standard industry formulas with waste included. Always confirm quantities with your supplier.
How many tiles do I need?
Multiply the room's length by its width to get square footage, add your waste allowance, then divide by the area of one tile. Straight layouts need 10% extra for cuts and breakage; diagonal and herringbone patterns waste more at the edges, so use 15%. Always buy the full amount in one order — tile dye lots vary, and a matching box six months later is never guaranteed.
Worked example. A 10 × 8 ft floor is 80 ft². For a straight layout, add 10% waste to get 88 ft². With 12×12 tiles (1 ft² each) that's 88 tiles; at the typical 10 ft² per box, that's ⌈88 ÷ 10⌉ = 9 boxes. Switch to a diagonal layout at 15% waste and the same floor needs 92 tiles, still 10 boxes.
| Tile size | Area each | Tiles per 100 ft² | +10% waste |
|---|---|---|---|
| 12 × 12 in | 1.00 ft² | 100 | 110 |
| 18 × 18 in | 2.25 ft² | 45 | 49 |
| 12 × 24 in | 2.00 ft² | 50 | 55 |
| 6 × 24 in | 1.00 ft² | 100 | 110 |
Tiles per 100 ft² before waste; add 10% for straight layouts, 15% for diagonal or herringbone.