Tile Quantity Estimator
Estimate the number of tiles and boxes for an area, accounting for tile size, grout joint width and waste.
Your inputs
Results
Tiles needed (incl. waste)
144
- Boxes
- 14
- Tiles per m² (with grout)
- 10.89
≈Estimate based on the stated model and assumptions
What this calculator does
Including the grout joint in each tile’s footprint gives a more accurate count.
Formula and method
Tile footprint = (length + joint) × (width + joint); Tiles = ceiling(area ÷ footprint × (1 + waste %))
Worked example
Calculated by this tool with its default inputs:
Inputs
- Area to tile: 12 m²
- Tile length: 30 cm
- Tile width: 30 cm
- Grout joint width: 3 mm
- Waste for cuts and breakage: 10 %
- Tiles per box: 11
Results
- Tiles needed (incl. waste): 144
- Boxes: 14
- Tiles per m² (with grout): 10.89
How to read the results
Tiles per m² is useful when comparing different tile sizes.
Assumptions and limitations
- Large-format tiles and patterns may need more waste.
Questions
Why include grout?
Joints take up space, so slightly fewer tiles are needed than area ÷ tile size suggests.
Methodology and verification
- Result type
- Estimate based on the stated model and assumptions
- Formula version
- 1.0
- Automated verification
- 2 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
- Editorial review
- Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.
Privacy
Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Inputs are added to a share link only if you choose to include them. Privacy policy