Tile guide
How Much Tile Do I Need? Square Footage, Boxes, and Waste
Estimate tile square footage, add waste for cuts, round up to full boxes, and plan thinset and grout quantities.
Short answer
Measure every surface receiving tile, add a waste allowance for cuts and breakage, divide by the square feet per box, and round up. Estimate thinset and grout separately using their package coverage.
Use the Tile CalculatorThe formula
- Measured tile area = sum of tiled rectangles, less substantial excluded areas
- Target tile area = measured area x (1 + waste percentage)
- Tile boxes = target tile area / square feet per box, rounded up
- Setting material bags = measured area / package coverage, rounded up
Worked example
A 120 sq ft tile floor with a simple layout
- Measured tile surface: 120 sq ft.
- Add 12% waste for cuts and breakage: 120 x 1.12 = 134.4 sq ft.
- At 15 sq ft per box: 134.4 / 15 = 8.96 boxes.
- At 60 sq ft per thinset bag and 150 sq ft per grout bag: buy 2 thinset bags and 1 grout bag.
Buy 9 boxes providing 135 sq ft of tile, then verify lot, mortar, grout, and installation instructions.
Measure the tiled surface
For a floor or wall made of rectangles, multiply each section's length by width and add the results. Measure backsplashes, niches, borders, and separate walls as distinct areas when they use the same tile.
Subtract only meaningful areas that will not receive tile. Small cutouts may be balanced by offcuts and the waste allowance, while a large cabinet footprint or shower opening can change the order.
Plan for cuts, patterns, and full boxes
Lowe's tile flooring calculator suggests purchasing an extra 10% for trim and waste. A clean straight layout can often begin there, while diagonal patterns, herringbone, niches, narrow cuts, or fragile tile may justify more.
Tile is normally sold in complete boxes, so always divide the waste-adjusted target by the printed box coverage and round up. Confirm that visible tile is compatible in shade or lot before installation.
- Use the coverage printed on the selected tile carton.
- Increase waste deliberately for layouts with more cuts or pattern matching.
- Keep usable spare tile for later repair when storage allows.
Do not forget setting materials
Thinset, grout, backer board, waterproofing, spacers, trim, and transitions do not come from the tile box count. Product coverage depends on tile size, trowel, joint width, substrate, and product instructions.
Use this calculation as a purchase estimate and confirm every system component for the surface and moisture conditions involved.
References and verification
Use these references together with the instructions and coverage or yield information on the product you select.