Tile calculator
Work out how many tiles you need for a floor or wall, with the grout joints and boxes.
Uses only the sizes you enter.
Show the workings
| Step | Sum | Answer |
|---|---|---|
| Space each tile takes, with its joint | 0.303 m × 0.303 m | 0.092 m² |
| Tiles in a square metre | 1 ÷ 0.09181 | 10.892 tiles |
| Tiles for the area | 7.2 m² × 10.892 | 78.424 tiles |
| Rounded up | 78.424 | 79 tiles |
Where the figures come from
This sum uses only the numbers you entered.
How many tiles do I need?
Work out the area, then divide it by the area one tile takes up with its grout joint. A wall 3 m by 2.4 m in 300 mm square tiles with 3 mm joints needs 7.2 ÷ (0.303 × 0.303) = 78.4, so 79 tiles before cuts and breakages.
Tiles cut at the edges and around fittings create waste. "Extra to allow" adds a percentage for that: how much depends on the room and the tile, so it is your choice.
Boxes of tiles say how many tiles or square metres are in a box. Enter the number of tiles in a box to see how many boxes to buy.