Tile Calculator | How Many Tiles per m²? Boxes & Grout

Tile calculator: enter area or length × width, tile size and grout gap to get tile count, boxes and cost. Ceramic / porcelain tiling estimate.

How is tiling calculated?

Tile count is the area to cover divided by the tile face including grout. Formula: tiles = area ÷ ((length + gap) × (width + gap)). Waste covers cuts and breakage; boxes are rounded up.

Steps

Enter floor or wall length and width (or total area).
Pick a tile size (20×20, 30×30, 30×60, 60×60 or custom).
Enter grout gap and waste (typically 8–12%).
Enter tiles per box and optional box price.
Read total tiles, tiles per m², boxes and cost.

Average tiles per m²

Guidance with ≈3 mm grout (excluding waste):

Tile size	Approx. per m²	Common use
20 × 20 cm	≈ 23–25	Bath / kitchen
30 × 30 cm	≈ 10–11	Floor / wall
30 × 60 cm	≈ 5–6	Wall / floor
60 × 60 cm	≈ 2.7–3	Large floors

Formula

Tiles = area ÷ ((tile length + gap) × (tile width + gap)). Order = ceil(tiles × (1 + waste%)). Boxes = ceil(order ÷ tiles per box).

Practical tips

Allow 8–10% waste for straight lays; 12–15% for diagonal or complex patterns.
Grout (2–5 mm) slightly reduces tiles per m².
Keep a spare box from the same batch to avoid shade mismatch.

Field note

Results are guidance only. Cutting layout, pattern and adhesive are confirmed with the quote.

Frequently asked questions

How do I calculate tiles?

Measure the area in m², add grout to tile length and width for unit area, divide area by unit area, then add waste and round up.

How many tiles per m²?

Depends on size: 30×30 ≈10–11, 30×60 ≈5–6, 60×60 ≈2.7–3 (≈3 mm grout, excluding waste).

How much tile waste should I allow?

About 8–10% for straight lays; 12–15% for diagonal, niches and heavy cutting.

How many boxes of tiles do I need?

Divide required tiles by tiles per box and round up. The calculator also estimates optional cost.

Is ceramic tile calculation the same?

Yes — the same formula applies. Differences are product type and pack size.