Tile Square Footage Calculator
Calculate the number of tiles needed for any room or surface, including a customizable waste factor for cuts and breakage.
Formulas Used
1. Room Area (sq ft)
Room Area = Room Length (ft) × Room Width (ft)
2. Effective Tile Layout Area (sq ft)
Effective Tile Area = ((Tile Length + Grout Joint) / 12) × ((Tile Width + Grout Joint) / 12)
Grout joint is added to each tile dimension to account for spacing between tiles.
3. Tiles Needed Without Waste
Tiles (no waste) = Room Area / Effective Tile Area
4. Tiles Needed With Waste
Tiles (with waste) = Tiles (no waste) × (1 + Waste% / 100)
Final count is always rounded up to the nearest whole tile.
5. Total Tile Area Purchased (sq ft)
Total Area = Tiles Needed × (Tile Length / 12) × (Tile Width / 12)
Assumptions & References
- Room dimensions are entered in feet; tile dimensions in inches.
- A 10% waste factor is the industry standard for straight-lay patterns; diagonal or herringbone layouts typically require 15–20%.
- The default grout joint of 1/8 inch (0.125 in) is common for rectified tiles; larger tiles often use 3/16 in or wider joints.
- Box coverage of 20 sq ft is used as a reference estimate only — verify the actual coverage on your tile packaging.
- This calculator assumes a rectangular area. For irregular shapes, break the area into rectangles and sum the results.
- Reference: Tile Council of North America (TCNA) Handbook for Ceramic, Glass, and Stone Tile Installation.
- Reference: National Tile Contractors Association (NTCA) installation guidelines.