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Tile calculator — tiles and boxes for a floor or wall

Enter the area in square metres, the tile size in millimetres and the grout joint. The result is an area-based estimate for one rectangular area; patterns, borders and cuts can need more.

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tile calculator

Tiles to buy
61tiles
Boxes
8boxes
Coverage per tile incl. joint
0.1827m²
Tiles per m² (no waste)
5.47

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TaskBider drafters, detailers and BIM coordinators work remotely and every listing shows the pay. Typical published range for this work: $18–$45/hr.

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Formula

tiles = ceil(area × (1 + waste/100) ÷ [(L + joint)(W + joint) ÷ 1,000,000]) · boxes = ceil(tiles ÷ tiles per box)

The 10% allowance is an editable assumption; diagonal or herringbone layouts often need more. Buy from one batch where colour matters.

Worked examples

InputResult
10 m², 600 × 300 mm, 3 mm joint, 10%11 ÷ 0.1828 = 60.2 → 61 tiles · 8 boxes of 8
20 m², 600 × 600 mm, 2 mm joint, 10%22 ÷ 0.3624 = 60.7 → 61 tiles

Tiles per m² (3 mm joint, no waste)

Tile sizeTiles per m²
100 × 100 mm94.26
200 × 200 mm24.27
300 × 300 mm10.89
600 × 300 mm5.47
600 × 600 mm2.75
800 × 800 mm1.55
1200 × 600 mm1.38

Questions

How many tiles do I need per square metre?

Divide 1 m² by one tile's area including the joint. For 600 × 300 mm tiles with a 3 mm joint, that is about 5.47 tiles per m², before waste.

How much extra tile should I buy?

10% is a common planning assumption for straight layouts; complex patterns and many cuts need more. Confirm with your installer.

Can I use feet?

Convert your area with the m² ↔ ft² converter and tile sizes with inches-to-mm first.

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