m²
cm
cm
%

Diagonal laying 15–20%, straight 10%, professional 5%.

Shopping list: packs, adhesive, groutgrout calculated · enter pack contents and adhesive

Printed on the pack – alternatively m² per pack

m²
mm
mm

The joint is about as deep as the tile is thick

kg
kg/m²

kg per m², depends on the notched trowel – printed on the bag

kg

Tiles needed

245tiles

245

For 20 m² you need 245 tiles of 30 × 30 cm: 223 for the area and 22 as waste allowance (10%).

20 m²
Area shown as a square, tiles to scale
  • Area223 pcs91%
  • Waste22 pcs9%
Grout0.26 kg/m² from tile size, joint width and depth; density 1.6 kg/dm³ assumed – the manufacturer's figure takes precedence
5.1 kg · 2 bags of 5 kg
Area per tile
0.09 m²
Tile area to buy
22.05 m²
How this was calculated
A_F = 0.3 m × 0.3 m = 0.09 m²
n = ⌈20 ÷ 0.09 × (1 + 10 %)⌉ = 245

Divide the area by the area of one tile, add the waste allowance and round up to whole tiles.

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