Tile Calculator: measuring notes and method
Split layouts before counting boxes
Measure each area using the same tile, subtract exclusions and set an allowance for its layout. Different tile sizes, borders or patterns should have their own project items.
Check tiles as well as boxes
The calculator rounds pieces up before rounding full boxes. Check batch, shade and calibration information with the supplier, and decide separately whether spare replacement tiles should be included.
CHECK A PRACTICAL EXAMPLE
How allowance changes the whole-box order
A 10 m² area uses 300 × 300 mm tiles in boxes of ten.
5% cutting allowance
- Tiles to buy
- 117
- Boxes to buy
- 12
10% cutting allowance
- Tiles to buy
- 123
- Boxes to buy
- 13
Review both individual tiles and whole boxes. The purchased tile count is boxes multiplied by tiles per box; decide separately whether replacement spares should be retained.
Fixed comparison in metric units. Values are illustrative unless linked to a recorded project; changing the calculator above does not change this example.
Formula
Units = net area with waste ÷ unit face area, rounded up. Packs = unit count ÷ units per pack, rounded up.
Worked examples in metric and imperial units
Illustrative values match Reset example and stay fixed when you edit the calculator. Both columns describe the same calculation; converted inputs are rounded.
Metric worked example
- Total surface area
- 24 m²
- Openings / excluded area
- 0 m²
- Tile length
- 300 mm
- Tile width
- 300 mm
- Tiles per box
- 10
- Waste allowance
- 10 %
Tiles to buy: 294
Imperial worked example
- Total surface area
- 258.3339 ft²
- Openings / excluded area
- 0 ft²
- Tile length
- 11.811 in
- Tile width
- 11.811 in
- Tiles per box
- 10
- Waste allowance
- 10 %
Tiles to buy: 294
Follow the calculation
Lengths in this working are in metres.
- Net area = 24 − 0 = 24 m².
- Unit face area = 0.3 × 0.3 = 0.09 m².
- Divide 26.4 m² including waste by unit face area and round up. Divide the rounded count by 10 per pack and round up again.
Reviewed 19 October 2026. How calculations are checked · Report a correction