Tile Calculator
This tile calculator works out how many tiles you need to cover a floor. Enter the width and length of the room in metres, the width and length of each tile in centimetres, and a waste percentage, and it instantly returns the number of tiles to buy along with the total area to cover. It is the fastest way to plan a tiling job for a bathroom, kitchen, terrace, or any room without over- or under-buying materials.
Tiles needed
Area to cover
It is recommended to add 10% waste to cover cuts, breakages, and spare pieces. For diagonal layouts or jobs with many cuts, increase that margin to 15%.
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How it works
The calculator first computes the floor area by multiplying the room width by its length, giving a value in square metres. It then computes the area of a single tile by converting each tile side from centimetres to metres and multiplying them. Dividing the floor area by the tile area gives the raw number of tiles, and multiplying by (1 + waste/100) adds an allowance for cuts and breakages. The result is always rounded up to the next whole tile, because you cannot buy a fraction of a tile. For example, a 4 × 5 m room is 20 m², a 30 × 30 cm tile is 0.09 m², and with 10% waste you need ceil(20 / 0.09 × 1.1) = 245 tiles.
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Preguntas frecuentes
- How do I calculate how many tiles I need?
- Measure the width and length of the floor in metres and multiply them to get the area in square metres. Then find the area of one tile by multiplying its two sides (converted to metres). Divide the floor area by the tile area, then add a waste margin for cuts and breakages. This calculator does all of that automatically and rounds the result up to whole tiles.
- Why should I add a waste percentage?
- Tiles at the edges of the room almost always need to be cut, and some pieces break during cutting or handling. A waste allowance ensures you have enough material to finish the job and a few spares for future repairs. A margin of 10% is standard for a straight layout; 15% is safer for diagonal patterns or rooms with many corners and cuts.
- Should I buy exactly the number the calculator gives?
- The number is a solid estimate that already includes waste, but it is a good idea to buy all the tiles from the same production batch at once, since colours and sizes can vary slightly between batches. Keeping a few extra tiles from the same batch is useful in case a tile cracks years later.
- What tile size should I enter?
- Enter the nominal size printed on the box, in centimetres — for example 30 × 30, 45 × 45, or 60 × 60. If the tiles are rectangular, enter the two different sides. The calculator uses the tile area, so the orientation of the tile on the floor does not change the count.
- Does the calculator account for the grout gap between tiles?
- No. The grout joints are usually only a few millimetres wide and slightly reduce the number of tiles needed, so ignoring them makes the estimate a little conservative — which is exactly what you want when buying materials. The waste percentage more than covers this small difference.