Tile Layout and Quantity Calculator
Calculate the exact number of tiles needed for any room or surface, accounting for tile size, grout joints, layout pattern, and waste factor.
Room / Surface Dimensions
Tile Dimensions
Layout & Waste
Formulas Used
Net Surface Area (ft²)
Net Area = (Room Length × Room Width) − Deduction Area
Tile Face Area with Grout (ft²)
Tile Face Area = [(Tile Length + Grout Joint) × (Tile Width + Grout Joint)] ÷ 144
Base Tiles Needed
Base Tiles = Net Area ÷ Tile Face Area
Total Tiles (with pattern & waste)
Total Tiles = ⌈ Base Tiles × Pattern Multiplier × (1 + Waste% ÷ 100) ⌉
Boxes Required
Boxes = ⌈ Total Tiles ÷ Tiles per Box ⌉
Assumptions & References
- Room dimensions are rectangular. For irregular rooms, break the space into rectangles and sum the areas.
- Grout joint width is added to each tile dimension to compute the effective tile footprint on the floor.
- Pattern multipliers follow industry standards: straight/grid = 0% extra, diagonal/45° = 10%, herringbone = 15%, brick/offset = 10% (TCNA Handbook for Ceramic, Glass, and Stone Tile Installation).
- A minimum 10% waste factor is recommended by the Tile Council of North America (TCNA) for straight layouts; 15–20% for diagonal or complex patterns.
- Always round up (ceiling function) to avoid running short of tiles mid-project.
- Deduction area accounts for fixed obstacles (kitchen islands, cabinets, fireplaces) that will not be tiled.
- Coverage per box is calculated using the effective tile face area (including grout joint), matching how manufacturers typically report box coverage.
- Reference: TCNA Handbook for Ceramic, Glass, and Stone Tile Installation; ANSI A108 standards.