Splashback Tile Calculator — How Many Tiles for a Splashback?

Our splashback tile calculator divides your splashback area by the individual tile area to determine the number of tiles needed, then adds allowances for wastage, socket cutouts, and window cutouts.

The formula

Splashback area = Width × Height

Tiles needed = Area ÷ Individual tile area (rounded up)

Tiles are estimated by coverage area, which assumes offcuts from edge cuts are reused elsewhere — the wastage allowance below covers cut waste and breakages. For an exact fixed-bond count, multiply (width ÷ tile width, rounded up) by (height ÷ tile height, rounded up).

Total tiles = (Tiles + Socket extras + Window extras) × 1.10 (10% wastage)

Material coverage rates

• Tile adhesive: ~3.5 kg/m² for small & standard wall tiles (6mm trowel); ~6 kg/m² for 600 × 300mm large format (12mm trowel, back-buttered)
• Grout: from the standard formula (TileL + TileW) × joint width × joint depth × 1.8 ÷ (TileL × TileW) kg/m² — typically ~0.1-0.5 kg/m² at a 2mm joint
• Edge trim: Top width + both side heights

Tile sizes available

• 100 x 100mm: Small square tiles — retro or mosaic look
• 150 x 150mm: Classic 6" square tile
• 200 x 100mm: Brick bond pattern
• 300 x 75mm: Metro / subway tile — the UK favourite
• 600 x 300mm: Large format — fewer grout lines

We add 1 extra tile per socket cutout and 5% extra if tiling around a window. The 10% standard wastage accounts for cuts, breakages and pattern matching.