Work out how many tiles and boxes cover a floor or wall, including grout joints and waste.
Divide the area by the area of one tile (including its grout joint), then add 10% for cuts and breakage. A 4 × 3 m floor with 600 mm tiles and 3 mm grout needs 37 tiles (33 before waste).
The Tile Calculator tells you how many tiles to buy for a floor, wall, backsplash or bathroom. Enter the area (as length × width or a total), the tile size, the grout joint width and a waste allowance. It returns the tiles needed, the boxes if you give the tiles per box, the area covered and — with a price — the estimated cost.
Allowing for waste matters: cuts around edges, breakage and pattern matching mean you should always buy more than the bare area. For irregular rooms, split the space into rectangles and add the results; use the Square Footage Calculator to measure odd shapes.
The calculation divides the surface area by the area each tile effectively covers.
| Area and tile | Tiles to buy | Boxes |
|---|---|---|
| 4 × 3 m, 600 mm tiles, 3 mm grout, 10% waste | 37 tiles | 10 (40 tiles) |
| 10 × 12 ft, 12 in tiles, no grout, 10% waste | 132 tiles | 14 (140 tiles) |
| 3 × 2.5 m, 300 mm tiles, 3 mm grout, 10% waste | 90 tiles | 9 (99 tiles) |
| 5 × 4 m, 800 mm tiles, 3 mm grout, 15% waste | 36 tiles | 12 (36 tiles) |
| Tile size | Area per tile | Tiles per m² (no grout) | Tiles per 100 sq ft (no grout) |
|---|---|---|---|
| 300 × 300 mm (12 in) | 0.0900 m² | 11.1 | 103 |
| 300 × 600 mm | 0.1800 m² | 5.6 | 52 |
| 600 × 600 mm (2 ft) | 0.3600 m² | 2.8 | 26 |
| 600 × 1200 mm | 0.7200 m² | 1.4 | 13 |
| 800 × 800 mm | 0.6400 m² | 1.6 | 15 |
| 1200 × 1200 mm | 1.4400 m² | 0.7 | 6 |
A straight layout in a simple room usually needs 5–10% extra. Diagonal layouts, herringbone patterns, large-format tiles and rooms with many corners need 10–20%. Buy a little extra for future repairs — dye lots can vary between batches.
Divide the floor area by the area of one tile plus its grout line, add 10% waste, and round up.
5–10% for simple layouts, 10–15% for diagonal layouts or many cuts, and up to 20% for complex patterns.
Slightly. Each tile effectively covers its own size plus the joint, so wider joints reduce the tiles you need.
About 2.78 tiles per m² without grout, since each covers 0.36 m².
100 tiles with no grout, plus waste — about 110 with 10% extra.
Split it into rectangles, calculate each one and add the tile counts; round the total up.
Divide the tiles needed by the number of tiles per box printed on the carton and round up.
Yes — enter the wall's height and width as the area. Subtract windows and doors if large.
Per tile, per box or per m², depending on how your supplier prices them.
No. Everything runs in your browser.
