From the square metres on the drawing to what you ask for at the counter: whole boxes, bags of adhesive and skirting pieces.
Use 7 % waste for a straight lay and 10 % for a diagonal one or a room with a lot of cutting.
| Gross area | 14.70 | m² |
|---|---|---|
| Net area | 14.70 | m² |
| Area including waste | 15.73 | m² |
| Coverage of one box | 1.44 | m²/box |
| Pieces in total | 44 | units |
| Adhesive | 78.6 | kg |
| Skirting | 28 | pieces |
Boxes are rounded up, and it is worth buying them from one production lot: two lots of the same format can differ in shade and in calibre. Grout is not included.
Divide the area to be covered, waste included, by the area one box holds, then round up to a whole box. A box of 60 × 60 cm tile with four pieces covers 1.44 m², so a 15 m² room with 7 % waste takes 16.05 m² and therefore 12 boxes. Tile is only sold by the box, so the rounding is part of the answer.
Seven per cent covers a straight lay in a regular room. Use ten per cent or more for a diagonal lay, a room with many corners, or a large format where a single cut wastes most of a piece. The allowance applies to the tile, the adhesive and the skirting together.
Between 4 and 6 kg per square metre, depending on the format and the notch of the trowel: about 4 kg for 30 × 30 cm and around 6 kg for 60 × 120 cm. The calculator starts from the figure for the format you pick and lets you overwrite it, then converts the total into 25 kg bags. Grout is not included.
These tools settle one quantity. Geztio builds the whole budget: chapters, unit-price analysis with real output rates, overhead and profit, and an Excel export.