Tile Calculator
Avoid running short or over-buying tile for your project. This calculator determines the exact number of tiles you need based on room dimensions, tile size, grout gap width, and a wastage percentage for cuts and breakage. It gives you the precise count to order, including box estimates.
The calculation accounts for both tile size and grout gaps:
- Room area = length × width (in square feet)
- Effective tile area = (tile length + grout gap) × (tile width + grout gap), converted to square feet
- Tiles needed = room area / effective tile area, rounded up
- Tiles to order = tiles needed × (1 + wastage %)
Recommended wastage percentages:
- Straight (grid) layout: 10% wastage
- Diagonal (45°) layout: 15% wastage
- Herringbone or complex patterns: 15-20% wastage
- Large format tiles in small rooms: 15% (more cuts needed)
Common tile sizes: 12×12", 18×18", 24×24" for floors; 3×6", 4×12", 6×24" for subway/wall tiles. The grout gap is typically 1/16" to 1/4" depending on tile type and style.