Tile calculator — tiles and boxes for a floor or wall
Enter the area in square metres, the tile size in millimetres and the grout joint. The result is an area-based estimate for one rectangular area; patterns, borders and cuts can need more.
tile calculator
- Tiles to buy
- 61tiles
- Boxes
- 8boxes
- Coverage per tile incl. joint
- 0.1827m²
- Tiles per m² (no waste)
- 5.47
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Formula
tiles = ceil(area × (1 + waste/100) ÷ [(L + joint)(W + joint) ÷ 1,000,000]) · boxes = ceil(tiles ÷ tiles per box)The 10% allowance is an editable assumption; diagonal or herringbone layouts often need more. Buy from one batch where colour matters.
Worked examples
| Input | Result |
|---|---|
| 10 m², 600 × 300 mm, 3 mm joint, 10% | 11 ÷ 0.1828 = 60.2 → 61 tiles · 8 boxes of 8 |
| 20 m², 600 × 600 mm, 2 mm joint, 10% | 22 ÷ 0.3624 = 60.7 → 61 tiles |
Tiles per m² (3 mm joint, no waste)
| Tile size | Tiles per m² |
|---|---|
| 100 × 100 mm | 94.26 |
| 200 × 200 mm | 24.27 |
| 300 × 300 mm | 10.89 |
| 600 × 300 mm | 5.47 |
| 600 × 600 mm | 2.75 |
| 800 × 800 mm | 1.55 |
| 1200 × 600 mm | 1.38 |
Questions
How many tiles do I need per square metre?
Divide 1 m² by one tile's area including the joint. For 600 × 300 mm tiles with a 3 mm joint, that is about 5.47 tiles per m², before waste.
How much extra tile should I buy?
10% is a common planning assumption for straight layouts; complex patterns and many cuts need more. Confirm with your installer.
Can I use feet?
Convert your area with the m² ↔ ft² converter and tile sizes with inches-to-mm first.
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