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Tiles and boxes needed for an area.
The tile calculator works out how many tiles and boxes you need to cover a floor or wall. Enter the room size (as length × width or as a total area) and the size of a single tile, and it divides one into the other while adding a wastage allowance for cuts and breakage.
It is useful for floor and wall tiling, backsplashes and outdoor paving — anywhere you want to buy the right quantity in one trip and avoid mismatched dye lots from a second order.
Areas are converted to a common unit before dividing. Tile dimensions in cm or inches are converted to the same unit as the room.
About 10% for a standard straight-laid floor is typical. Use 15% or more for diagonal and herringbone patterns, large-format tiles, or rooms with lots of angles and obstacles that force extra cuts.
Measure the full floor area you intend to tile. You can subtract large permanent features such as a kitchen island footprint, but leaving them in simply adds to your spare tiles, which many tilers prefer.
For estimating purposes the tile's nominal size (which effectively includes a small joint) is close enough. Wide grout lines slightly reduce the tile count, but the wastage allowance more than covers the difference.
Retailers sell tiles by the box, so you cannot buy a fraction of a box. The calculator rounds boxes up so you always have at least the tiles you need.