Large-format porcelain comes in few tiles per box and wastes more at the walls, because each cut can throw away a big piece. This calculator starts with large sizes and narrow joints and counts the boxes.
Before buying, check the cuts in the tile layout calculator: with big tiles, a badly placed starting line can leave thin slivers along a whole wall.
How to use
- Enter the floor area or the room dimensions.
- Pick the porcelain size. Rectified tiles take a 1/16 in joint.
- Choose the layout pattern; the waste allowance follows it.
- Type the coverage per box from the label to get the number of boxes.
Large-format tiles per 100 sq ft
| Tile size | Tiles per 100 sq ft | With 10% waste | One tile covers |
|---|---|---|---|
| 24×24 in | 25 | 27.5 | 4 sq ft |
| 24×48 in | 12.5 | 13.75 | 8 sq ft |
| 32×32 in | 14.06 | 15.47 | 7.111 sq ft |
| 36×36 in | 11.11 | 12.22 | 9 sq ft |
| 48×48 in | 6.25 | 6.88 | 16 sq ft |
| 8×48 in | 37.5 | 41.25 | 2.667 sq ft |
Without grout joints.
Waste with large formats
With 24 × 48 in tiles, every cut piece that isn't reused is up to 8 sq ft lost. Plan for at least 10% in a straight layout and 15% in diagonal, and order a few spare tiles: the same shade can be hard to find later.
Setting large porcelain
Use a 1/2 × 1/2 in trowel and back-butter every tile (see the thinset calculator). The floor must be flat; a leveling system helps avoid lippage between tiles.
Where the numbers come from
Coverage and consumption figures come from manufacturer data sheets and published standards: