How Much Tile Waste Should I Buy?
Tile waste is the extra tiles you order beyond the exact fit, covering cuts at edges, breakage during installation, and future repairs. The right waste factor depends on your tile size, pattern, and room shape.
Standard Waste Factors
| Installation | Waste % | When to Use |
|---|---|---|
| Straight-lay, rectangular room | 10% | Default for most projects; few cuts needed |
| Diagonal (45°) pattern | 15% | Every tile at the perimeter is cut at an angle |
| Herringbone pattern | 15% | Intricate cuts; significant waste |
| Large-format tile (24"+) | 15% | Higher breakage rate during cutting |
| Natural stone with color variation | 20% | Need extra to sort and match colors |
| Versailles or complex pattern | 20%+ | Multiple tile sizes; intricate layout |
Why 10% Is the Default
For a typical straight-lay installation in a rectangular room, about 5-8% of tiles are cut at the perimeter. The additional 2-5% covers breakage during cutting (especially diagonal cuts) and a small buffer for future repairs. 10% is the industry standard minimum.
Why Large-Format Tiles Need More Waste
Large-format tiles (24 × 24 inches and larger) are more prone to breakage during cutting because they apply more stress to the tile saw. They also generate larger offcuts that can't be reused. If your subfloor is uneven, large tiles may crack during installation — increase waste to 15%.
Save Extra Tiles for Repairs
Beyond the waste factor, save 1 full box of tiles for future repairs. Tile dye-lots vary between production runs, so replacement tiles bought later may not match exactly. Store extras flat in a dry location and label them with the room name and purchase date.
Use the Calculator
The Tile Calculator lets you enter your specific waste percentage. Start with 10% for straight-lay, 15% for diagonal or herringbone, and 20% for natural stone.