Tile Calculator
Calculate how many m² of flooring or tile boxes to buy. Includes safety margin (10%, 15%, 20%) for cuts and breakage. Everything in your browser.
Calculating ceramic floor tile quantity
The rule is boxes = (room_area · 1.10) / m²_per_box, rounded up. The 10% safety margin covers cuts, breakage during installation, and spares for future replacements (production batches and shades change over time, so it's smart to keep extra tiles from the same lot). Tiles are sold per box; coverage typically ranges from 1.5 to 2.5 m² per box on residential ceramics. Example: 20 m² room with 2 m²/box → (20 · 1.10) / 2 = 11 boxes. Laying direction (diagonal, herringbone) increases waste — consider 15–20% margin in those cases.
Applications and standards
Used for renovation budgeting at Leroy Merlin, Telhanorte, C&C, and quotes with bricklayers. Also estimate tile adhesive (4–5 kg/m² indoor AC-I, AC-II/III outdoors) and grout (~0.5 kg/m²). Brazilian standard NBR 13753 covers ceramic floor installation. PEI rating (Porcelain Enamel Institute) classifies wear resistance: PEI 3 residential, PEI 4 light commercial, PEI 5 heavy traffic.
FAQ
Why 10% extra and not just exact m²? Cuts at walls, broken pieces during transport/installation, and future repairs all need spare tiles — buying later from a different lot risks shade mismatch.
Does laying pattern matter? Yes. Straight laying wastes ~5–8%; diagonal or herringbone can reach 15–20%. Increase the margin accordingly.
What about porcelain vs ceramic? Calculation is identical, but porcelain costs more per m² and needs AC-II/III adhesive. Always check PEI rating against the room's expected traffic.
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How much flooring or tile to buy
Few calculations weigh on a renovation as much as getting the amount of flooring or tile right. Underestimate it and things usually end badly, with you unable to find the same batch weeks later. Here you work out how many square metres, or how many boxes, to buy for the area you mean to cover.
The safety margin is what makes the difference. You can add 10%, 15% or 20% to the footage and cover the cuts, the unavoidable breakages and a few spare pieces every job ends up needing. That way you don't buy the exact amount and sit there hoping nothing runs short; you leave with the right buffer for your installation type.
It all runs in the browser. Use it as a reference to plan your tile purchase and dodge that mid-renovation scare.