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How Many Tiles for a 4 m² Bathroom Floor?

A 4 square metre bathroom floor takes 44.4 tiles of 300 x 300 mm, or 49 with 10% for waste. At 11 tiles a pack, that is five packs.

Try your own numbers

Area lengthArea widthThe floor or wallGrout jointTile lengthTile widthClose-up
Key The area to cover, and one tile with its grout joint.
Units
Work out by
Area to cover

Add a rectangle for each part of an L-shaped or split room.

Common tile sizes. 300, 450 and 600 mm squares, and 300 x 600 mm rectangles. Use the size printed on the box. Editorial rule of thumb.
mm
mm
mm
%
Area4 m²
Tiles with no waste44.4
Tiles to buy, with waste49 tiles
Packs (11 per pack)5 packs (55 tiles)
Area the tiles cover4.41 m²

2 × 2 m = 4 m². 4 m² ÷ one 300 × 300 mm tile = 44.44 tiles; with 10% waste = 48.89, rounded up to 49.

Diagonal or patterned layouts need more waste, commonly 15%. Grout and adhesive are not included.

Fig. 1 A 2 x 2 m floor, 300 x 300 mm tiles.

Every formula is tested against worked examples. How we check

WasteTilesPacks
5%47 tiles5 packs
10%49 tiles5 packs
15%52 tiles5 packs

Fig. 2 The same floor at common waste allowances.

Last checked 10/11/2026. Defaults are editorial rules of thumb; each one is explained in the guide below.

Small rooms need more waste

Each 300 × 300 mm tile covers 0.09 m², so 4 ÷ 0.09 = 44.4 tiles. Add 10% and you need 48.9, so 49 tiles. In a small bathroom there are more cuts around the toilet, basin and door, so a higher allowance, such as 15%, is sensible. At 15% the order is 52 tiles.

The grout joint matters a little: a 3 mm joint makes each tile cover about 2% more, which brings the no-waste figure to 43.6 tiles.

Packs. The tool rounds up to whole packs using the tiles-per-pack you enter; 11 is an example, so use the figure on your pack. Tiles from different batches can differ in shade, so buy the full order at once and keep a few spare. Waterproofing and falls in a wet area are separate matters for a qualified person.

Common questions

What if my floor is not a rectangle?

Add each part as its own rectangle with the add button. The tool adds the areas together.

Should I use the same waste for wall tiles?

Wall tiles are often cut around fittings too. 10% is a common starting point, and higher for diagonal layouts.

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