Construction material calculator
Quantities for blockwork, plaster, reinforcing steel, floor tiles, paint and roofing sheets from your own dimensions. Every assumption is shown and can be changed. For concrete, use the concrete calculator.
Result
- Tiles laid
- 55
- Tiles to buy, with waste
- 61
- Boxes
- 16 of 4
Buy all the tiles from one batch: shades vary between production runs. Keep a few spare for repairs.
No cost is estimated: the site has no verified material price observations yet, and it does not estimate a cost from an unverified figure.
What this is for
How many floor tiles, and how many boxes, a room takes. It is an estimate for ordering and checking, not a design or a bill of quantities for a contract.
How it works
- One tile with its joint covers (length + joint) × (width + joint).
- Tiles = floor area ÷ that × (1 + waste %), rounded up; boxes = tiles ÷ tiles per box, rounded up.
Assumptions
Each one is an input above. None of them is a legal or standard requirement.
| Assumption | Value used | Where it comes from |
|---|---|---|
| Tile length | 0.6 m | Product size. |
| Tile width | 0.6 m | Product size. |
| Grout joint | 0.003 m | Your choice. |
| Waste allowance | 10 % | Site rule of thumb. Cuts at the walls and breakage. Diagonal patterns need more. |
| Tiles in a box | 4 | Product size. Printed on the box. |
Worked example
A 20 m² floor in 600 × 600 mm tiles with 3 mm joints: each tile covers 0.3636 m², so 55 tiles laid, or 61 with 10% waste: 16 boxes of four.
Limitations
- Adhesive, grout and skirting are not included.
- Patterns laid on the diagonal waste more than the straight lay assumed here.
- Quantities only: no labour, transport or cost.
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