How many tiles and boxes do you need?
Tiles and boxes by area, with an allowance for cuts and grout lines.
How to use the calculator
Measure the length and width of the floor with a tape measure, in metres. Take the size of one tile from the pack in centimetres — the nominal 30×30, 60×60 or 20×60. The same pack states how many tiles it contains: without that number you cannot convert pieces into packs.
The cutting allowance depends on the layout. Straight laying from wall to wall — 5–10%. Diagonal, herringbone and offset layouts — 10–15%: there are noticeably more offcuts, especially in tight spots near walls and pipes. For a small bathroom, take the upper bound.
Why the allowance is not wasted
Tiles are cut at the edges, they go around risers, hatches and thresholds. Some tiles break in delivery, some are lost to cutting defects — a chip on the edge shows immediately. If the material runs short, you will have to look for the same collection, and it may be discontinued or made in another batch: the shade and calibre of tiles drift from batch to batch.
The remainder of the last pack is not thrown away: in a year or two it will come in handy if a tile cracks or a section by the riser needs redoing.
What the calculation does not account for
Joints: 2–3 mm hardly affect the number of tiles, that is a fraction of a percent of the area. For complex geometry — bay windows, slopes, going around pipes — calculate by the actual area with a 15% allowance. And check whether the real tile size matches the declared one: for porcelain stoneware the calibre can differ by a couple of millimetres, which is already centimetres over a large area.
Frequently asked questions
How much cutting allowance should I add?
5–10% is enough for a straight lay. For diagonal or herringbone patterns, allow 10–15%: there are noticeably more offcuts, especially along the edges.
Are the grout lines between tiles taken into account?
No. A 2–3 mm joint barely affects the tile count: it accounts for a fraction of a percent of the area. If you want to be precise, add 1–2% to the allowance.
What if tiles are only sold by the box?
The calculator converts tiles to boxes itself and rounds up. What is left in the last box covers cuts and future repairs.
Should I measure the floor area or the wall area?
For a floor, length × width. For walls, the room perimeter × height, minus the doorway if the tiles do not run behind it.
Related tools
Checked: 26 October 2026. For reference only — the result depends on the material and the skill of the installer.