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About this tool
Calculate floor tiles, boxes, adhesive and grout for any room area including a wastage allowance.
This calculator converts a room's floor area into the number of tile boxes to order by dividing floor area by the area of a single tile, adding a wastage percentage for cuts and breakage, then rounding up to whole boxes. It also sizes the tile adhesive from the standard 1.5 kg per square metre per millimetre of bed thickness, and the grout from the joint-volume formula printed on grout packs. It is aimed at homeowners placing a tile order and at contractors preparing a material take-off.
Open Floor Tile Quantity Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Rounds tiles up to whole boxes, because dealers will not split a carton.
Adds a cutting and breakage allowance you can tune from 0% to 40%.
Adhesive kilos, bag count and grout weight come out alongside the tiles.
About 26 tiles for the bare area, or 29 tiles once a 10% wastage allowance is added. One 600 x 600 mm tile covers 0.36 square metres, which is 3.875 square feet, so 100 sqft divided by 3.875 gives 25.8 tiles before wastage.
Allow 5% to 10% for a plain square room laid straight, 10% to 15% for an irregular room with many cuts, and 15% to 20% for diagonal or herringbone layouts. Larger format tiles waste more per cut because the offcut is often too big to reuse elsewhere.
Roughly two and a half 20 kg bags for 100 sqft at a 3 mm bed. Cementitious tile adhesive spreads at about 1.5 kg per square metre per millimetre of bed, so 100 sqft (9.29 sqm) at 3 mm needs about 42 kg. Uneven substrates and large-format tiles need a thicker bed and more adhesive.
Yes. Ceramic and vitrified tiles are shade-sorted and calibrated per production batch, and boxes from a different batch can differ visibly in tone and by a fraction of a millimetre in size. Check that every carton carries the same batch or shade code before you accept delivery.
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