Tile Calculator
Estimate how many tiles, boxes and adhesive you need for a tiling project. Enter the area to tile, the tile size and the number of tiles per box — the calculator reports the quantity required with a waste allowance included.
Enter project details
Enter project details, then press Calculate tiles.
Tile quantity formulas
Tile area = tile length × tile width
Tiles needed = (Area to tile × (1 + waste/100)) ÷ Tile area
Boxes needed = ⌈Tiles needed ÷ tiles per box⌉
Typical waste allowances: 5% for a simple rectangular room laid straight; 10% for most rooms; 15% or more for diagonal patterns, herringbone or complex shapes with many cuts.
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Frequently asked questions
Waste covers cut tiles at edges, tiles that break during installation, minor measuring errors and future repairs. A spare box or two ensures you can match the exact dye lot if any tile is damaged later.
Add the total areas together before entering. For example, two 10 m² rooms → enter 20 m². The waste allowance applies to the total, which is fine because cuts in each room average out.