Tile Calculator

Tiling a floor or wall involves buying a fixed number of individual tiles that come in boxes, so getting the count right — with a sensible margin for cutting and breakage — directly affects both your budget and how many extra trips to the tile shop you make. The Tile Calculator handles the two trickiest parts of this: making sure floor area and tile size are expressed in the same unit before dividing, and building in a realistic waste allowance so a straightforward calculation does not leave you short by exactly the number of tiles you cut in half at the edges. The core calculation divides total floor area by the area of a single tile to get a raw tile count, then increases that by a waste percentage to cover cuts around the room's perimeter, breakage during handling, and future repairs. The tricky part is units: floor area is usually measured in square meters or square feet, while tile dimensions are almost always given in centimeters or inches — dividing square meters by square centimeters without converting first would produce a wildly wrong number (off by a factor of 10,000). The calculator converts tile dimensions into the same unit as the floor area before doing the division, so a 30cm × 30cm tile becomes 0.3m × 0.3m = 0.09 m² automatically. Worked example: a 20 m² bathroom floor with 30cm × 30cm tiles and a 10% waste allowance. Tile area = 0.3 × 0.3 = 0.09 m². Raw tile count = 20 / 0.09 ≈ 222.2 tiles. With 10% waste: 222.2 × 1.1 ≈ 244.4, rounded up (ceiling) to 245 tiles — the extra 23 tiles cover diagonal cuts at walls, breakage, and a few spares for future repairs. A common misconception is that waste allowance should only cover breakage. In reality, the biggest source of "waste" in most rooms is cutting tiles to fit around edges, pipes, and irregular corners — a rectangular room tiled in a straight grid can easily lose 10-15% of tiles to partial cuts along two adjoining walls alone, and diagonal layouts or rooms with many corners can push that closer to 15-20%. Choosing a waste percentage that matches your room's actual complexity, not just a flat 10% by default, is the detail that separates an accurate order from an emergency second delivery. Larger tiles compound this effect in a counterintuitive way: fewer total tiles are needed to cover the same area, but each individual cut tile represents a proportionally bigger chunk of wasted material, and large-format tiles are also more prone to cracking during transport and cutting. This is why professional tilers often quote a higher waste percentage for large-format tile (30cm and above) than for small mosaic-style tile, even though intuition might suggest the opposite — fewer, bigger pieces means each mistake costs more.