As an Amazon Associate I earn from qualifying purchases.
Enter room length and width, pick a tile size, get exact tiles and boxes. A 10x12 room is 120 sq ft — order 132 sq ft with 10% waste, 138 for diagonal.
With these inputs:
| Result | Value |
|---|---|
| Tiles to buy | 66 |
| Net floor area | 120 sq ft |
| With waste | 132 sq ft |
| Tile face area | 2 sq ft |
| Boxes to buy | 9 |
Round up to full boxes. Keep one unopened box as your dye-lot match for repairs.
<> Floor area is length × width, minus untiled areas. We divide the adjusted area by the face area of one tile, then add your waste factor and round up to full tiles and full boxes. Tiles per box varies by manufacturer — check the box label, which also states the square feet per box. If you know coverage per box instead of pieces per box, divide your total square footage (with waste) by that number.
10% for a straight layout in a rectangular room, 12–15% for offset or diagonal patterns, and up to 20% for herringbone. Keep one unopened box for future repairs.
Most installers tile under appliances but not under fixed cabinets. Subtract the cabinet footprint, but tile under the dishwasher and fridge so the floor height stays even.
12×24 and 12×12 are forgiving in small rooms. Very large tile (24×48) can make a small room choppy and needs a very flat floor; mosaic works anywhere but means more grout.
Need the whole roof at once? The free roofing calculator works out roof area, squares, shingle bundles, underlayment, drip edge, ridge cap and installed cost from one set of measurements.