Work out how many tiles to buy. This free tile quantity calculator turns your area and tile size into tiles needed, adds a waste allowance for cuts, and gives the number of boxes.
Area to tile
m
m
m²
cm
cm
%
Enter the area (room size or total) and your tile dimensions. A waste allowance of about 10% covers cuts and breakages — use 15% for diagonal or patterned layouts.
Tiles needed
—
Enter your area & tile
Area
—
Tiles (no waste)
—
With waste
—
Boxes
—
Tiles needed = area ÷ tile area, rounded up, plus a waste margin. Buy from the same batch where possible (shades vary between batches) and keep spares for future repairs.
Use this free tile quantity calculator to work out how many tiles you need. Enter your area and tile size, add a waste allowance, and get the number of tiles and boxes.
What this tile calculator does
A tile quantity calculator divides your area by the tile size, rounds up, and adds a waste margin for cuts and breakages — then converts the total into boxes if you know the tiles per box.
How many tiles you need
tiles = area ÷ (tile width × tile height)
with waste = tiles × (1 + waste %)
boxes = tiles ÷ tiles per box
A 20 m² floor with 30 × 30 cm tiles and 10% waste needs about 245 tiles; with larger 60 × 60 cm tiles the same area needs around 46.
How much waste to allow
Layout
Waste allowance
Straight / grid
~10%
Diagonal
~15%
Herringbone / patterned
~15–20%
Lots of cuts / odd shape
15%+
Buying tips
Order from the same batch where possible — shades vary between batches — and keep a few spares for future repairs. Round up to full boxes, since most suppliers sell by the box.
How to use the tile calculator
Enter room size or total area, and units.
Enter the tile dimensions and waste %.
Add tiles per box for the number of boxes.
Tile Quantity FAQ
How many tiles do I need?
Divide your area by the area of one tile and round up, then add about 10% for waste. A 20 m² floor with 30 × 30 cm tiles needs roughly 245.
How much waste should I add for tiles?
About 10% for a straight layout, and 15% or more for diagonal, herringbone or heavily cut areas.
How do I calculate tiles per square metre?
Divide 1 m² by the tile's area. A 30 × 30 cm tile is 0.09 m², so about 11 tiles cover a square metre.
How many boxes of tiles will I need?
Divide the total tiles (including waste) by the tiles per box and round up, since tiles are usually sold by the box.
Why buy from the same batch?
Tile shades can vary slightly between production batches, so ordering together — plus a few spares — keeps the finish consistent.
Is the tile quantity calculator free?
Yes, this tile quantity calculator is completely free, needs no sign-up, and gives instant results in your browser.
