Tile calculator
Turn square footage into tile boxes.
Plan tile pieces, boxes, waste allowance, and a simple material budget before ordering.
Tile inputs
Tip: choose an allowance after sketching the layout. Use the coverage printed on the exact carton, not a category average or the tile's nominal size.
How this tile estimate is calculated
The calculator converts your project area into tile pieces for a layout reference, then adds an allowance for cuts, breakage, pattern matching, and future repairs. The purchase quantity is calculated from the coverage printed on the selected carton, because a box's stated coverage can differ from a simple nominal-size calculation.
Formula: adjusted area = project area x (1 + waste rate). Single tile area = tile width x tile height / 144. Pieces needed = adjusted area / single tile area. Boxes needed = adjusted area / selected carton coverage, rounded up.
| Input | Why it matters | Practical note |
|---|---|---|
| Project area | Sets the base square footage before waste. | Measure floors and walls separately if they use different tile. |
| Tile size | Changes how many pieces are needed for the same area. | Use it as a layout reference; nominal and actual dimensions can differ. |
| Waste rate | Covers cuts around corners, fixtures, thresholds, and mistakes. | State why the allowance matches this layout before entering it. |
| Coverage per box | Determines the final carton count. | Use the actual coverage printed on the selected carton and round to whole boxes. |
Example: 120 sq ft floor
For a 120 sq ft floor using 12 in by 24 in tile, each tile has a nominal area of 2 sq ft. With a 10% layout allowance, the adjusted area is 132 sq ft, or about 66 tiles before carton rounding.
If the selected carton states 16 sq ft of coverage, the project needs 9 boxes. At $36 per box, the material budget is $324 before setting materials, grout, spacers, trim, delivery, and tools.
When to increase waste
- Diagonal, herringbone, checkerboard, or other patterned layouts.
- Small bathrooms with many corners, drains, niches, and fixtures.
- Natural stone, handmade tile, or fragile material with more breakage.
- Discontinued tile where matching replacements may be impossible later.
- Rooms where the installer needs extra pieces for layout balancing.