How to Measure for Floor and Wall Tiles

Measurement Checklist

• Choose floor or wall so the result label matches the project.
• Split the surface into rectangular areas.
• For floor areas, measure length and width in metres.
• For wall areas, measure wall width and tile height coverage in metres.
• Enter tile width and tile height in millimetres.
• Enter the waste percent you want applied before tile rounding.
• Enter the whole number of tiles per box from the box label.

Worked Example

1. One floor area is 4 m x 5 m = 20 m2.
2. With 10% waste, waste-adjusted area = 20 x 1.1 = 22 m2.
3. A 300 mm x 600 mm tile is 0.3 m x 0.6 m = 0.18 m2.
4. Tiles required = ceil(22 / 0.18) = 123.
5. With 8 tiles per box, boxes required = ceil(123 / 8) = 16.

Common Mistakes

• Entering tile size in metres when the calculator expects millimetres.
• Measuring a wall from floor to ceiling when tile will stop at a lower height.
• Subtracting openings or fixtures inconsistently. This V1 only adds rectangular areas that you enter.
• Using boxes required as exact layout guidance. The calculator does not place tiles or calculate cuts.
• Expecting grout quantity. The calculator includes a grout and joint note but does not estimate grout.

Assumptions and Limitations

• Each area is treated as a rectangle: length x width.
• Total surface area is the sum of all rectangular areas.
• Waste is applied after total surface area is calculated.
• Tile area uses width x height after converting millimetres to metres.
• Tiles are rounded up to whole tiles, then boxes are rounded up to whole boxes.
• Grout and joint width affect layout planning, but this V1 does not calculate grout quantity or make installation claims.