About this calculator
Tiles for a floor, wall, shower or backsplash, with the adhesive and grout to fix them, in one takeoff.
How it’s calculated
Each tile plus its joint covers (width + joint) × (length + joint). Tiles = area ÷ that × (1 + waste). Adhesive is taken as about 3.5 kg/m² (6 mm notch), or 5.5 kg/m² for large-format tiles laid on a solid bed.
Worked example
With these inputs:
- Measure by
- Length × width
- Length
- 4.5 m
- Width
- 3.6 m
- Tile width
- 300 mm
- Tile length
- 600 mm
- Grout joint
- 3 mm
- Layout
- Straight, many cuts (10%)
- Tiles per box (optional)
- 0
the result is:
- Tiles needed
- 98 tiles
- Area
- 16.2 m²
- Tiles per m²
- 5.47
- Grout (approx.)
- 3.8 kg
Tips from the trade
- Large-format tiles (longer than 15" or 380 mm) and anything laid diagonally need more waste and more adhesive.
- Lay out a dry row before mixing anything, and avoid slivers under half a tile at the edges.
- Back-butter large tiles for full coverage, especially in showers.
Common questions
How many tiles do I need for 10 m²?
300 × 600 mm tiles with 3 mm joints: about 55 tiles before waste, about 60 with 10%.
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and the Building Regulations before ordering.