Tile Calculator

It depends on tile size and grout spacing. With standard 3mm grout: 300×300mm tiles give approximately 11 tiles per m², 600×600mm tiles give approximately 2.8 tiles per m², and 300×600mm tiles give approximately 5.6 tiles per m². Larger tiles mean fewer per square metre, but each cut tile wastes a larger piece.

Allow 10% for a standard straight lay, 15% for diagonal or herringbone patterns, and up to 20% for complex patterns or rooms with many cuts (e.g. lots of corners, columns, or alcoves). Always keep a few spare tiles from the same batch for future repairs — matching tiles years later is often impossible.

2–3mm for rectified (precision-cut) tiles, 3–5mm for non-rectified tiles. Floor tiles commonly use 3mm spacing, while wall tiles often use 1.5–2mm. Wider grout joints help compensate for slight size variations in non-rectified tiles and provide better waterproofing in wet areas.

Diagonal layout requires more cuts where tiles meet walls and edges. Every tile along the perimeter must be cut at an angle, and the offcuts are often too small to reuse. This generates 15% or more waste compared to roughly 10% for a straight lay. The visual effect can be striking, but factor in the extra material cost.

Yes, provided the existing tiles are firmly bonded, level, and thoroughly cleaned. Use a suitable primer or bonding agent designed for tile-on-tile application. It is generally not recommended for wet areas (bathrooms, showers) or where the added floor height would cause problems with door clearances, transitions to other rooms, or step heights.