Home & Construction
Tile Calculator
Calculate tile face area, whole tiles required after waste, whole boxes required, purchased coverage, and estimated material cost. The page includes a live room-layout diagram, box-rounding explanation, worked ordering example, field-measurement guidance, limitations, and a professional PDF record.
Area per tile-
Tiles required with waste-
Boxes required-
Estimated tile cost-
Decision view
Tile layout, cutting reserve, and box order
Tile layout, cutting reserve, and box orderThe room surface is tiled as repeated modules; waste and whole-box rounding remain visible instead of being hidden inside one cost number.
Exact scenario comparisonWaste allowance (%) changes while all other entered assumptions remain constant.
| Waste allowance (%) | Area per tile | Tiles required with waste | Boxes required | Estimated tile cost |
|---|
How to use Tile Calculator
- Measure each rectangular surface separately, subtract openings only when they are genuinely not tiled, and combine the resulting square metres.
- Enter the actual nominal tile dimensions, the supplier's tiles-per-box quantity, and a waste allowance suited to the layout.
- Order the calculated whole boxes from one production batch and confirm that their stated box coverage is consistent with the entered dimensions.
Calculator guide
Understanding Tile Calculator
Tile orders must cover the finished surface and the pieces lost to edge cuts, breakage, pattern alignment, and pack rounding. This calculator keeps those stages separate so the purchase quantity can be checked before an order is placed.
Calculation method
How the calculation works
Calculate tile face area, increase project area by waste, round tile and box quantities upward, and multiply boxes by price. Convert tile length and width from millimetres to metres, multiply them for tile face area, increase the measured surface by the selected waste percentage, divide by tile area, round tiles upward, then divide by tiles per box and round boxes upward.
Layout planning
Choose waste from the cutting pattern, not habit
The same room can need different quantities when tile direction or pattern changes.
Confirm the final layout and the installer's preferred reserve before placing a nonreturnable order.
Worked situations
Practical examples
- A 600 mm by 300 mm tile covers 0.18 m2 before allowing for grout joints or manufacturing tolerance.
- A 38 m2 surface with 10% waste requires coverage for 41.8 m2, or 233 whole tiles at 0.18 m2 each.
- With eight tiles per box, 233 tiles round to 30 boxes; those boxes contain 240 tiles and provide a small rounding reserve.
Better inputs
Useful tips
- Measure alcoves, returns, shower walls, and separate rooms as distinct rectangles instead of forcing one rough average.
- Increase waste for diagonal layouts, herringbone patterns, many corners, large-format tiles, or fragile natural stone.
- Keep unopened attic stock from the same dye lot for future repairs; do not assume a later batch will match.
Before relying on the result
Limitations and common mistakes
- The model treats the entered tile face as full coverage and does not deduct grout-joint width from the module.
- Borders, mosaics, pattern repeats, book-matching, stair nosings, trims, adhesive, grout, membranes, and labor are not priced.
- Manufacturer box coverage and installer layout should override a dimension-only estimate when they differ.
Reference
Key terms
- Nominal tile size
- The marketed length and width used for planning; actual manufactured dimensions can differ slightly.
- Waste allowance
- Extra coverage reserved for cutting, pattern alignment, breakage, defects, and future replacement.
- Module
- One tile plus its planned grout joint, used by installers to set out repeated courses.
- Dye lot
- A production batch whose shade and surface character are intended to match.
Important note
Calculated from the entered measurements and stated coverage or quantity rules. Confirm field dimensions, waste, product requirements, structural conditions, and local codes before purchasing or building.
Frequently asked questions
Should grout joints reduce the tile quantity?
Usually not in a simple purchasing estimate. Supplier box coverage already reflects the product system more reliably than subtracting every joint manually.
Can I subtract doors and windows?
Subtract large untiled openings, but small openings can create extra cutting and may not reduce the order by their full area.
Why are tiles and boxes both rounded up?
A fraction of a tile cannot cover a final cut, and most suppliers sell only complete boxes.
Is 10% waste always enough?
No. Layout, room shape, tile fragility, pattern repeat, installer practice, and desired repair stock determine the appropriate allowance.