Tile calculator in square metres

3 × 4 m floor, 12 m² · 30 × 30 cm tile, straight lay

Buy 147 tiles

with 10% extra · 134 cover it exactly

One tile: 0.09 m², 11.11 per m²

Your numbers

Room length

Room width

Area Or type the area; the width follows

Tile width

Tile length

Layout Straight Diagonal

Tiles per box Optional, from the carton

Tiles per m² by size

9 sizes, nominal, joints not deducted. For 10 m² is what to buy with 10% extra; your size is marked when it is one of these.
Size	Per m²	For 10 m²
10 × 10 cm	100.00	1,100
7.5 × 15 cm	88.89	978
15 × 15 cm	44.44	489
20 × 20 cm	25.00	275
30 × 30 cm	11.11	123
30 × 60 cm	5.56	62
45 × 45 cm	4.94	55
60 × 60 cm	2.78	31
60 × 120 cm	1.39	16

Measuring in feet and inches? Use the tile calculator in square feet, with grout and thinset.

Sources

Figures built September 2026.

Where these numbers come from (1)

Overage: TileBuys, “How to calculate tile needed”, retrieved from https://www.tilebuys.com/pages/how-to-calculate-tile-needed on 2026-09-24. Chart values are restated as numbers; no text or table is reproduced.

Quantities are estimates for buying materials. Actual use depends on tile variation, joint depth and installation; manufacturers publish their coverage figures for estimating only.