Tile Calculator (Flooring)

Calculate how many tiles or boxes you need for a floor or wall, including grout gaps and waste.

How do I calculate how many tiles I need?

Tiles = area ÷ (tile area including grout) × (1 + waste). A 4 m × 3 m floor (12 m²) with 30 × 30 cm tiles and 3 mm grout needs about 131 tiles, or about 144 with 10% waste.

Waste allowance

10% for straight layouts.
15% for diagonal and herringbone patterns.
Keep a few spare tiles from the same batch for future repairs — shades vary between batches.

Frequently asked questions

Do I include grout?

Yes, the gap slightly increases the area each tile covers.

How do I tile an L-shaped room?

Split it into rectangles and add the results.

Can I use inches?

Yes, switch to imperial units.