Tile calculator
Enter the area in m², the tile size and joint width in mm, and see the tiles, adhesive and grout to buy.
Adhesive coverage depends on the trowel notch size; check the adhesive.
Estimates only. Check the manufacturer's coverage rates.
How this is calculated
Tiles are counted from the area each tile covers including its joint: (tile length + joint) x (tile width + joint). A 300 x 300 mm tile with a 3 mm joint covers 0.0918 m², so 10 m² with 10% wastage needs 120 tiles. The count is rounded up.
Adhesive is estimated from the area and a coverage figure in kg per m², 4 kg by default. Adhesive use varies with the trowel notch size and how flat the surface is, so check the adhesive and adjust the coverage. The total is divided by the bag size, 20 kg by default, and rounded up to whole bags.
Grout is estimated with the formula (length + width) / (length x width) x thickness x joint x 1.6, with all sizes in mm; 1.6 is a typical grout density, shown here as an assumption. Deeper joints and thicker tiles use more grout. The result includes the wastage allowance and is rounded up to whole bags, 5 kg by default.
The wastage allowance covers cuts and breakages. Keep spare tiles from the same batch for future repairs.
- Adhesive use varies with the trowel notch size and how flat the surface is. Check the adhesive.
- 1.6 is a typical grout density, shown as an assumption.
- Keep spare tiles from the same batch.
Frequently asked questions
How is the grout estimate worked out?
(tile length + width) / (length x width) x thickness x joint width x 1.6, with all sizes in mm. 1.6 is a typical grout density, shown as an assumption.
How much adhesive do I need?
The default is 4 kg per m², but adhesive use varies with the trowel notch size and how flat the surface is. Check the adhesive.
Why keep spare tiles?
Colours and shades can vary between batches, so keep spare tiles from the same batch for future repairs.