Tile Calculator
Calculated using standard mathematical and industry formulas.
Calculate exact ceramic, porcelain, or stone tile quantities for floors and walls factoring in tile size, grout lines, and waste factor.
How to use this calculator?
- Enter room dimensions.
- Enter tile size & grout.
- Read tiles and boxes needed.
Formula & calculation method
Tile Grid Formula
Tiles = Room Area / (Tile + Grout Area)
Grout gap accounted.
Step-by-step calculation example
120 sq ft with 12x12 tiles = 132 tiles (14 boxes).
Key insights to remember
- Diagonal pattern requires 15% waste.
How to interpret your results?
Boxes Needed
Total tile boxes to order.
Frequently asked questions
- How much tile waste percentage should I add?
- Add 10% waste for straight grid tiling, 15% for diagonal or herringbone patterns, and 20% for room layouts with many angles.
- How do you calculate tile boxes to buy?
- Divide total required tiles (including waste) by tiles per box, then round up to the next whole box.
- How much tile adhesive is needed per sq meter?
- Standard thin-set mortar requires ~3.5 to 4 kg per m² for standard tiles, or 5 to 6 kg/m² for large format tiles.
- How much grout is needed?
- Grout quantity depends on joint width (2–5 mm) and tile size. For 60x60 cm tiles with 3 mm joints, estimate ~0.3 kg/m².
- Should I keep extra tiles after installation?
- Yes, always keep at least 1 full box of unused tiles for future repairs or tile replacement.
- What is minimum grout line width?
- Industry standards require at least 2 mm grout lines for rectified tiles indoors, and 4 mm for non-rectified or outdoor tiles.
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