How the tile calculation works
Tiles = ceiling[(area ÷ tile area) × (1 + waste percentage ÷ 100)]. Tile area is converted from mm² to m².
Worked example
A 5 m × 4 m floor is 20 m². A 300 × 300 mm tile covers 0.09 m². With 10% allowance, the estimate is 245 tiles.
Guide: using this calculator accurately
For the full explanation, worked examples, measurement tips and FAQs, read the Tile Guide →.
Measure the tiled area
For a rectangular floor, measure length and width. For a wall, measure the wall width and height. For multiple walls, calculate each surface separately and add the areas.
Measure tile size correctly
Use the nominal tile dimensions printed on the product packaging. Tile sizes are commonly listed in millimetres, so 300 × 300 mm equals 0.09 m².
Why you need extra tiles
Tiles may need to be cut around edges, corners, doors and fixtures. Some pieces can break during cutting or installation. Keep spare tiles from the same batch when possible.
How layout changes tile quantities
A diagonal layout or a layout with many small edge pieces can create more waste than a simple grid. Patterned tiles may also require matching.
Common tile-calculation mistakes
Do not divide by the tile perimeter or use millimetres as metres. Convert tile dimensions to square metres before calculating the tile count.
Frequently asked questions
Does the calculator include grout?
No. Grout quantity depends on tile size, joint width and depth, so it needs a separate calculation.
What waste percentage should I use?
Use the tile manufacturer or installer recommendation. More complex layouts usually create more off-cuts.
Can I use this for wall tiles?
Yes, for a simple rectangular wall or group of rectangular walls. Measure the actual tiled surface rather than the whole room.