How to use Tile & Box Calculator
Estimate whole tiles, waste allowance and full boxes for a rectangular area.
- Measure the area in metres and tile faces in centimetres.
- Choose a waste allowance for your own layout; do not assume one percentage fits every project.
- Round tiles up, then round again to the number sold per box.
Formula & calculation method
Tiles = ceil(area × (1 + waste ÷ 100) ÷ tile face area). Boxes = ceil(tiles ÷ tiles per box). Tile dimensions in centimetres are converted to square metres.
Input reference · 6 fields
These labels describe the calculation’s base units. Supported measurements can switch through the header’s region settings; follow the current workspace labels. Prefilled values are examples.
- Area length (m)
- Enter a plain number with a decimal point if needed. The workspace shows an illustrative value, not a recommendation.
- Area width (m)
- Enter a plain number with a decimal point if needed. The workspace shows an illustrative value, not a recommendation.
- Tile length (cm)
- Enter a plain number with a decimal point if needed. The workspace shows an illustrative value, not a recommendation.
- Tile width (cm)
- Enter a plain number with a decimal point if needed. The workspace shows an illustrative value, not a recommendation.
- Waste allowance (%)
- Enter a plain number with a decimal point if needed. The workspace shows an illustrative value, not a recommendation.
- Tiles per box
- Use the actual pack quantity. No grout deduction is made.
A quick example
A 4 m × 3 m area has 12 m². At 30 cm × 30 cm per tile with 10% allowance, ceil(13.2 ÷ 0.09) = 147 tiles. Boxes of 10 mean 15 boxes and 150 tiles supplied.
Assumptions, edge cases & limits
- This is a face-area estimate with no grout deduction or layout optimizer. Cuts, patterns, openings and breakages can change the order. Adhesive and grout are not estimated.
- The geometric model is rectangular. An irregular floor, diagonal layout or matching pattern needs a separate layout check.
Questions about Tile & Box Calculator
Why is the tile estimate rounded up twice?
The area plus waste is rounded up to a whole tile count, then that count is rounded up to whole boxes. This reflects buying whole products rather than fractions of a pack.
Does the tile calculator deduct grout gaps?
No. It uses the tile face dimensions and your waste percentage. Complex patterns, cuts, breaks and a spare stock requirement may need a different allowance.
Are my files or inputs uploaded?
Calculation and file processing run in your browser without a processing upload. Downloads go to your device. Choosing a next-step transfer creates a temporary local copy for that workflow. Region preferences are stored separately from tool inputs. See our privacy details.
Can I use this tool for free?
Yes. No signup, subscription or payment is required to use the tool or download its output. File tools have device and size limits; a smaller batch may work better on a phone.
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