Tile calculator
Add 10% to your area for cuts and breakages, or 15% for diagonal and herringbone layouts.
- Boxes
- 7
- Area
- 6.00 m²
- Adhesive (20kg bags)
- 3
- Adhesive
- 40.2 kg
- Grout
- 1.2 kg
3 × 2 m in 300 × 600 mm tiles, plus 10% for cuts and breakages.
Tiles include extra for cuts. Buy all your tiles from the same batch so the shade matches.
Tiles per square metre
Before adding extra for cuts. Grout is for a 3 mm joint and 9 mm tile.
| Tile size | Tiles per m² | With 10% extra | Grout per m² |
|---|---|---|---|
| 100 × 100 mm | 100 | 110 | 0.76 kg |
| 150 × 150 mm | 44 | 49 | 0.50 kg |
| 200 × 200 mm | 25 | 28 | 0.38 kg |
| 250 × 400 mm | 10 | 11 | 0.25 kg |
| 300 × 300 mm | 11 | 13 | 0.25 kg |
| 300 × 600 mm | 5.6 | 7 | 0.19 kg |
| 600 × 600 mm | 2.8 | 4 | 0.13 kg |
| 600 × 1200 mm | 1.4 | 2 | 0.09 kg |
How we calculate this
We take your area, add extra for cuts and breakages based on the layout, then divide by the area of one tile. Tiles and boxes are rounded up.
Adhesive: Tile Mountain says a 20kg bag covers 4 to 5 m² with a 6 mm notched trowel, and 2.5 to 3.5 m² with a 10 to 12 mm trowel. We use the middle of each range. Grout uses the formula from Sika’s grout data sheet, plus 10%.
Questions people ask
How many extra tiles should I buy?
About 10% extra for a straight or brick layout, and 15% for diagonal or herringbone, which need more cuts. Keep a few spare tiles after the job in case one cracks later.
Which trowel size do I need?
A 6 mm notched trowel suits most standard wall and floor tiles. Larger tiles need a 10 to 12 mm notch. Very large tiles may also need adhesive spread on the back of each tile. Always follow the advice on your adhesive bag.
How much grout do I need?
It depends on the joint width, the tile thickness and the tile size. Small tiles have more joints, so they need much more grout per square metre than large ones. The table shows the difference.
Why should tiles come from the same batch?
Tiles from different production runs can vary slightly in shade or size. The batch number is printed on the box. Buying everything at once, with spares, keeps them matching.
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