How many tiles do I need for 100 sq ft?
Use the tile area, not the box label alone: 100 sq ft divided by the area of one tile gives the bare count, then add an allowance and round up to whole boxes. RoomTakeoff counts every partial edge cell as a full tile, so the result below is a conservative starting point for a 10 × 10 ft floor. With 12 × 12 in tile (1 sq ft each) the grid is 10 × 10 = 100 cells, 110 tiles after a 10 percent allowance, and 8 boxes at 14 per box.
| Tile size | Grid | Cells | Tiles with 10% allowance | Tiles per box | Boxes |
|---|---|---|---|---|---|
| 12×12 in tile | 10 × 10 | 100 | 110 | 14 | 8 |
| 12×24 in tile | 5 × 10 | 50 | 55 | 8 | 7 |
| 18×18 in tile | 7 × 7 | 49 | 54 | 6 | 9 |
Not a 10 × 10 room? Enter your own length and width in the planner, or start from a room size guide. Straight versus diagonal layout changes the allowance: see tile waste percentage for a diagonal layout.
Assumptions and sources
Waste percentages (5, 10, 15 and 20 percent), 350 sq ft per gallon paint coverage, 2 coats and a 1/8 in grout joint are RoomTakeoff planning assumptions, not figures taken from a manufacturer or standards document. Check the label on your tile, paint and trim, and confirm installation practice with the tile manufacturer or the Tile Council of North America resources linked below.
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