How this calculation works
Convert the measured surface and tile dimensions into compatible units before estimating units and full boxes. Waste allows for cuts, breakage and retained spares, while box rounding reflects how material is sold. The result does not lay out individual tile cuts, so diagonal patterns, borders or a small awkward room may need a different allowance from a large rectangular floor.
Worked example
This example uses illustrative inputs. Your current result is shown above.
For 10 m² of floor, 600 × 600 mm tiles, four tiles per box and 10% waste, allow 11 m². Each tile covers 0.36 m², so ceiling(11 ÷ 0.36) = 31 tiles. That requires eight whole boxes, supplying 32 tiles.
Assumptions and limits
- The area field and tile-side fields have independent unit selectors; a square unit must not be used as a side length.
- Tiles are rectangular. Grout gaps, pattern matching and offcut reuse are not modelled, and all boxes contain the entered fixed quantity.
Questions people ask
Why do the boxes contain more tiles than the result requests?
The tile count is rounded to a whole unit first, then to a full box. The extra units are a consequence of pack size.
Does the waste percentage include grout?
No. It is a material allowance. The calculation divides by the tile face area and does not design grout spacing or the cutting layout.