Tile Calculator (Floor & Wall)

The number of tiles depends on the floor or wall area and the tile size. Adding wastage for cuts and breakages avoids running short.

How to use the tile calculator

Enter the area dimensions, tile size, grout joint and waste allowance. The area and number of tiles are calculated.

Tile formula

Tiles = area ÷ ((tile length + joint) × (tile width + joint)) × (1 + waste)

Example

A 4 × 3 m floor with 600 × 600 mm tiles, 3 mm joints, 10% waste:

Area = 12 m²
Tiles = 12 ÷ (0.603 × 0.603) × 1.1 = 37 tiles

Tiles per m² for common sizes (3 mm joint)

Tile	Tiles per m²	Tiles for 10 m² + 10%
100 × 100 mm	94.3	1037
200 × 200 mm	24.3	267
300 × 300 mm	10.9	120
300 × 600 mm	5.5	61
400 × 400 mm	6.2	68
600 × 600 mm	2.8	31
600 × 1200 mm	1.4	16
800 × 800 mm	1.6	18

Adhesive and grout

Material	Rough quantity
Tile adhesive (6 mm notched trowel)	3–4 kg per m²
Tile adhesive (10–12 mm trowel, large tiles)	5–6 kg per m²
Grout	0.2–1 kg per m², depending on tile size and joint width

Larger tiles with thin joints need less grout.

Wall tiles

For walls, calculate each wall separately: width × height minus windows and doors. Tiles often stop at a set height, such as 1.2 m or full height in showers.

Layout tips

Start from the centre of the room so cut tiles at the edges are equal.
Avoid slivers less than half a tile wide at visible edges.
Buy all tiles from the same batch (shade and calibre) and keep a few spares for repairs.

Tiles per m² (before waste)

Tile size	Tiles per m²
300 × 300 mm	10.9
600 × 300 mm	5.5
600 × 600 mm	2.8
800 × 800 mm	1.55

Frequently asked questions

How much extra tile should I buy?

About 10% for straight layouts and 15% for diagonal or herringbone patterns. Keep a few spare for future repairs.

How many 600 × 600 tiles are in a square metre?

About 2.8 tiles (before waste).

Should I buy tiles by the box?

Yes — round up to whole boxes, and buy from the same batch so the colour matches.

How many 600 × 600 tiles in 1 m²?

About 2.75 tiles with 3 mm joints, before waste.