Tile Calculator
Work out how many tiles cover a surface, as an exact count and as whole tiles, with an optional allowance.
Worked example
A 2 m² surface covered with tiles 30 cm by 30 cm, which is 0.09 m² each, needs about 22.2 tiles. You cannot buy part of a tile, so that is 23 whole tiles. With a 10% allowance the count becomes about 24.4, so 25 whole tiles.
How we calculated this
The number of tiles is the surface area divided by the area of one tile. That figure is kept exact, and then rounded up to a whole tile. If you type an allowance, it is added to the exact count before rounding up, so a bigger allowance can only ever ask for the same number of tiles or more.
A result written as a plain number is exact. A result starting with “≈” has been rounded to 10 significant figures, because its exact decimal never ends or is too long to read comfortably. When an exact value is long, its full digits are shown underneath. The calculation itself is never rounded: only the display is.
What this result means
The result is the number of whole tiles needed to cover the surface, including any allowance you chose.
Common mistakes
- Working from the area alone and forgetting to round up. You cannot buy part of a tile, so the count is always a whole number.
Assumptions and limitations
- Gaps between tiles and the layout are not included, and tiles are not cut. You can use the allowance to leave room for cuts and breakages.
- Grout, adhesive and box sizes are not calculated.