Tile calculator
The tile count comes from the module of tile plus grout joint, the same as brickwork.
%
Tiles needed
73
- Tiles per square metre
- 5.47
- Adhesive At about 4 kg per square metre for a notched bed.
- 48.0
- Grout
- 2.59
- Weight of the tiles
- 259
- Rough trim length
- 13.9
Show the working
- Area to tile = 12
- Tile length = 600
- Tile width = 300
- Grout joint = 3
- Cutting waste = 10
- Tile thickness = 9
- module_area = (600 + 3) * (300 + 3) / 1e6 = 0.182 709
- Tiles per square metre = 0.182 709 > 0 ? 1 / 0.182 709 : 0 = 5.473 18
- Tiles needed = ceil(12 * 5.473 18 * (1 + 10/100)) = 73
- Adhesive = 12 * 4 = 48
- joint_volume = 12 * 3/1000 * 9/1000 * (1/(600/1000) + 1/(300/1000)) = 0.001 62
- Grout = 0.001 62 * 1600 = 2.592
- Rough trim length = sqrt(12) * 4 = 13.8564
- Weight of the tiles = 12 * 9/1000 * 2400 = 259.2
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- tiles per square metre = 1 / ((tile length + joint) x (tile width + joint))
- grout volume = joint width x tile thickness x total joint length
Large-format tiles need more adhesive and a flatter substrate; 6 kg per square metre is closer for tiles over 600 mm.