Enter the area you’re tiling, the size of one tile in centimetres, and a waste margin for cuts and breakages. The tool gives the number of whole tiles to buy plus the total square metres. It runs entirely on your device.
Enter a value.
Enter the area and tile size to see how many tiles to buy.
Tiles are rounded up to whole units and then you should round up to whole boxes. Keep spares from the same batch for repairs.
How it works
One tile’s area is width × height (converted from centimetres to metres). Divide the area you’re covering by that, then round up — you can’t buy a fraction of a tile. A 50 × 50 cm tile is 0.25 m², so 10 m² needs 40 of them before any waste.
The waste margin covers cuts at edges, around pipes, and the odd cracked tile. Ten percent suits a straightforward rectangular room; go to 15% for diagonal layouts, lots of corners, or large-format tiles where offcuts are less reusable. The tool adds the margin to the area before working out the count.
Practical examples
A bathroom floor
A 6 m² floor with 30 × 30 cm tiles (0.09 m² each) needs 67 tiles bare; with 10% waste that’s 74. Buy full boxes, so round up to the nearest box.
Large-format wall tiles
A 12 m² wall in 60 × 30 cm tiles (0.18 m²) is 67 tiles, or 74 with 10% waste. Big tiles crack more in transit — keep the margin.
A diagonal layout
Laying 25 × 25 cm tiles diagonally across 8 m² produces more offcuts, so use 15% waste: 8 m² becomes 9.2 m², which is 148 tiles.
Frequently asked questions
How do I measure the area to tile?
Multiply the width by the length of each surface in metres and add them up. For an L-shaped floor, split it into rectangles. Our area calculator handles triangles and other shapes if a surface isn’t rectangular.
What waste percentage should I use?
Ten percent is a safe default for a plain rectangular room. Increase to 15% for diagonal or herringbone patterns, rooms with many corners and cut-ins, or large-format tiles whose offcuts rarely fit elsewhere.
Do I enter tile size in cm or mm?
Centimetres. A common 30 × 30 tile is entered as 30 and 30. If your tiles are listed in millimetres (say 600 × 300), divide by ten first — that becomes 60 and 30.
Should I buy by the box?
Yes. Tiles are sold in boxes covering a fixed area, so round the tile count up to whole boxes. Buying an extra box from the same batch is cheap insurance — later batches can differ slightly in shade.
Does grout spacing change the count?
Only slightly. Grout joints make each tile effectively a few millimetres larger, which very marginally reduces the count. For normal 2–3 mm joints it’s within the waste margin, so it’s safe to ignore.
Can I use this for walls as well as floors?
Yes. The maths is the same — enter the wall area instead of the floor area. Just calculate each wall’s area (width × height) and total them before entering.
What about tiles that aren’t square?
Enter the actual width and height, e.g. 60 and 30 for a rectangular tile. The tool multiplies them, so any rectangle works. Only irregular mosaic sheets need their coverage read off the box instead.
Is anything I enter sent to a server?
No. The calculation happens in your browser and none of your measurements are uploaded or shared with analytics.
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