Tile Layout Quantity Calculator
Estimate whole tiles and purchased coverage from net wall or floor area, tile dimensions and an adjustable waste allowance.
Your results
Calculation breakdown
- Tile quantity
- ceil(ceil(net m² ÷ tile m²) × allowance factor)
Worked example
An 18 m² surface using 600 × 300 mm tiles needs 100 tiles before waste and 111 whole tiles with a 10% allowance.
Assumptions
- Net area already reflects the chosen opening deductions.
- Tiles share one nominal face size and are suitable for the substrate.
Sources
Rates effective 23 August 2026.
How this calculator works
Tile face dimensions are converted from millimetres to metres to calculate the nominal coverage of each piece. The net count is rounded before a separate allowance covers perimeter cuts, breakage, colour selection and future repairs, while layout-specific losses remain a site check.
Frequently asked questions
How much tile waste should I allow?
The right allowance depends on room shape, tile size, laying pattern, batch variation and the number of cuts; confirm it with the installer.
Does the result include grout joints?
No. It uses nominal tile face area, which gives a conservative material count because narrow grout joints slightly increase installed coverage.
Should I keep spare tiles after the job?
Keeping matching spares is useful because the same colour batch or product may be unavailable when a future repair is needed.