Work out how many tiles to buy
Tiles sell by the box or piece — and breakage eats the surplus. Get the count plus the waste allowance in one pass.
Tools used in this guide
The job
A 3×4 m bathroom wall with 300×600 tiles needs more than 'area ÷ tile area' — cuts along every edge produce unusable offcuts, and a dropped tile is a write-off. Buying the exact net count guarantees a second trip.
Compute it
Enter the surface dimensions and the tile size in mm. Set the waste percentage — 10% covers straight lay with normal cutting; diagonal or herringbone wants 15–20%. Tiles-per-box converts the final count into purchase boxes.
Worked example
4 m × 3 m wall, 600×300 tiles: area 12 m² ÷ 0.18 m² = 67 tiles net. At 10% waste the tool says 74 tiles; at 11 tiles per box, 7 boxes — and two spares left over for future repairs.
Limits
Area-based counting assumes a regular grid. Odd shapes, half-tiles required for edges, and pattern shifts all change real counts — the waste % is your honest allowance, not a precise model. Rectangular surfaces only.