10 m² of 300 × 300 mm tiles
With 3 mm joints and 10% waste: 120 tiles. At 11 per box, that's 11 boxes.
Tile Calculator
Count the tiles and boxes you need for a floor or wall, including grout joints and waste.
Result
Enter your values and select Calculate to see the result.
Result
Enter your values and select Calculate to see the result.
Runs in your browser — nothing you enter is sent to a server.
How the Tile Calculator works
Enter the area and the tile size. Each tile covers its own size plus one grout joint in each direction, so the calculator divides the area by that and adds a waste allowance for cuts and breakage. Add the number of tiles per box to see how many boxes to buy.
Formula
tiles = area ÷ ((length + joint) × (width + joint)) × (1 + waste), rounded up
Examples
Diagonal layout
Use 15% waste instead — more tiles are cut at the edges.
Frequently asked questions
How much waste should I allow?
About 10% for a straight layout, 15% for diagonal or herringbone, more for small rooms with many corners.
Should I keep spare tiles?
Yes — a few spares make repairs possible if the design is discontinued.
How do I measure an L-shaped room?
Split it into rectangles, work out each area and add them together.
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