Tile Quantity
Free Tile Quantity calculator with clear step-by-step results.
About Tile Quantity
Tiles cover a module equal to the tile plus one grout joint, so a 300 × 300 mm tile on a 3 mm joint occupies 303 × 303 mm and 10.9 tiles fill a square metre. Waste is unavoidable: perimeter cuts, door thresholds, pipe penetrations and the odd tile that breaks on the cutter. Tiles are also sold in whole boxes, so the practical answer is the box count.
Formulas
Tiles per square metre
Tiles/m² = 1 ÷ ((tile length + grout) × (tile width + grout))
Order quantity
Tiles to order = ceil(area × tiles/m² × (1 + waste))
Worked example
With the default values below, Tile Quantity returns Tiles to Order of 145. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Area to tileminimum 0 m²
- 12 m²
- Tile lengthminimum 10 mm
- 300 mm
- Tile widthminimum 10 mm
- 300 mm
- Grout jointaccepts 0–20 mm
- 3 mm
- Cutting wasteaccepts 0–50 %
- 10 %
Results
- Tiles to Order
- 145 tiles
- Tiles Fixed
- 131 tiles
- Tiles per m²
- 10.89
- Boxes of 10
- 15 boxes
Step by step
- 1Values used
- 2Tiles per square metre
- 3Order quantity
- 4Tiles to Order= 145 tiles
- 5Tiles Fixed= 131 tiles
- 6Tiles per m²= 10.89
- 7Boxes of 10= 15 boxes
Assumptions and limits
- The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
- This is a tile count only. Substrate preparation, decoupling, waterproofing and the correct adhesive and grout for the tile and location must follow the manufacturer's instructions and applicable standards.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
This is a tile count only. Substrate preparation, decoupling, waterproofing and the correct adhesive and grout for the tile and location must follow the manufacturer's instructions and applicable standards.
Frequently Asked Questions
How much waste should I allow?
10% for a straight layout in a simple rectangular room, 15% for a diagonal or brick-bond layout, and 20% for large-format tiles or rooms with many cuts, since large tiles waste more per cut.
Should I buy from one batch?
Yes. Shade and size vary slightly between production batches, so order the full quantity including waste in one go and keep a few spares for future repairs.
Does the grout joint really matter?
On small tiles it does. A 3 mm joint on a 100 mm mosaic changes the count by about 6%; on a 600 mm tile the same joint changes it by well under 1%.