Tile Calculator
Enter your room size and tile dimensions to find how many tiles and boxes you need, with a waste allowance built in for cuts and breakages.
Ordering tile is about area, not just room size. You work out the space to cover, divide by the area of a single tile, then add a margin for the tiles you'll cut around edges and the odd one that cracks. This calculator does all of that and rounds up to whole tiles and boxes, so you leave the shop with enough to finish the job — and a couple of spares for later.
How to work out how many tiles you need
Find the area to cover, work out the area of one tile, divide, then add waste and round up. Buying by the box means rounding up again to whole boxes.
Tile area (sq ft) = (Tile W × Tile H) ÷ 144
Tiles = Area ÷ Tile area × (1 + waste), rounded up
| Tile size | Per 100 sq ft (+10%) |
|---|---|
| 12 × 12 in | 110 tiles |
| 12 × 24 in | 55 tiles |
| 6 × 24 in (plank) | 110 tiles |
| 18 × 18 in | 49 tiles |
Worked example
A 12 ft × 10 ft floor with 12 × 12 in tiles, 10% waste, 10 per box:
| Area = 12 × 10 | 120 sq ft |
| Tiles = 120 ÷ 1 × 1.10 | 132 |
| Boxes = 132 ÷ 10 | 14 |
How much waste to allow
Ten percent is a good default for a simple square or rectangular room laid straight. Add more — around 15% — for diagonal layouts, lots of corners and cutouts, or large-format and patterned tiles where offcuts are harder to reuse. Herringbone and other complex patterns can push waste higher still. It's always cheaper to buy a little extra now than to reorder later and risk a different production batch that doesn't match.