Tiles needed for 40 sq ft, by tile size
| Tile size | Exact | +10% waste | +15% waste |
|---|---|---|---|
| 3×6 in (subway) | 320 | 352 | 368 |
| 4×4 in | 360 | 396 | 414 |
| 6×6 in | 160 | 176 | 184 |
| 6×24 in (wood-look plank) | 40 | 44 | 46 |
| 12×12 in | 40 | 44 | 46 |
| 12×24 in | 20 | 22 | 23 |
| 18×18 in | 18 | 20 | 21 |
| 24×24 in | 10 | 11 | 12 |
| 24×48 in | 5 | 6 | 6 |
40 sq ft is typical of a small bathroom floor, shower walls or a kitchen backsplash. Use the 15% column for diagonal layouts and for large-format tiles in rooms with many cuts.
The math (12×24 tile)
40 sq ft × 1.10 = 44 sq ft
44 × 144 ÷ (12 × 24) = 22 tiles (rounded up)
Setting materials
Thinset coverage depends on the trowel notch: larger tiles need a bigger notch and more mortar. Check the coverage chart on the bag for your trowel size, and buy grout by the coverage chart for your tile size and joint width.
Common questions
How many 12x12 tiles for 40 sq ft?
44 tiles with 10% waste (40 exactly).
How many 12x24 tiles for 40 sq ft?
22 tiles with 10% waste — each 12×24 tile covers 2 sq ft.
Want the full method, tips and other sizes? See the tile calculator guide.