Enter the room, the tile size and the layout pattern. The calculator adds the right waste allowance, rounds up to whole tiles and, if you type the coverage printed on the box, tells you how many boxes to buy.
It handles L-shaped rooms and several areas at once, and lets you subtract things like a shower or a kitchen island. For ceramic, porcelain, stone or vinyl tiles alike.
How to use
- Measure the room. For an L-shaped room use the L-shape option; for a hall plus a closet, use several areas.
- Pick a common tile size or type your own, and the grout joint width.
- Choose the layout pattern. The waste allowance changes with it: 10% straight, 15% diagonal, 20% herringbone.
- Type the coverage per box (on the box label) to get the number of boxes.
Tiles per 100 sq ft
| Tile size | Tiles per 100 sq ft | With 10% waste | One tile covers |
|---|---|---|---|
| 12×12 in | 100 | 110 | 1 sq ft |
| 12×24 in | 50 | 55 | 2 sq ft |
| 18×18 in | 44.44 | 48.89 | 2.25 sq ft |
| 24×24 in | 25 | 27.5 | 4 sq ft |
| 6×24 in | 100 | 110 | 1 sq ft |
| 24×48 in | 12.5 | 13.75 | 8 sq ft |
| 3×6 in | 800 | 880 | 0.125 sq ft |
Without grout joints. The joints make each tile cover slightly more, so the real count is a little lower.
How the tile count works
Tiles = floor area × (1 + waste) ÷ area of one tile including its joint. A 12 × 24 in tile covers 2 sq ft, so a 120 sq ft floor plus 10% (132 sq ft) needs 66 tiles; with a 1/8 in joint each tile covers a little more and 65 are enough.
How much extra tile to buy
Add 10% for a straight or brick layout, 15% for diagonal and 20% for herringbone. Small rooms, many corners and large-format tiles waste more. Keep a few spare tiles from the same lot for future repairs.
Where the numbers come from
Coverage and consumption figures come from manufacturer data sheets and published standards: