Tile Waste Calculator
Calculates recommended tile overage percentage by analyzing room geometry, tile dimensions, pattern difficulty (herringbone, pinwheel, diagonal 45°), and extra reserve tiles for future repairs.
Formula
Total Waste % = Base (7%) + Room Shape % + Pattern % + Tile Size % + Attic Reserve %
1. Base Cut Waste = 7% 2. Shape Addition: Simple=0%, L-Shape=3%, Complex=6% 3. Pattern Addition: Straight=0%, Diagonal=5%, Herringbone=10% 4. Size Addition: Large Format=3%, Medium=0%, Mosaic=2% 5. Total Waste % = Base + Shape + Pattern + Size 6. Total Order Sq Ft = Net Area × (1 + Total Waste %)
Inputs
- Net Floor / Wall Area
- Room Shape & Complexity
- Tile Pattern
- Tile Size Class
- Attic Stock Reserve (For future plumbing/cracks)
Worked example
L-shaped room with large format tile installed in a complex herringbone pattern.
Outcome: Calculated total waste factor is 7% base + 3% shape + 10% pattern + 3% size = 23% total waste. Net area of 200 sq ft requires 246 sq ft total (46 sq ft of waste/reserve).
What is attic stock and why should I keep extra tile?
Attic stock is 1 to 2 extra unopened boxes of tile and leftover dye-lot grout stored in your garage or attic. If a plumbing leak or accident damages 2 tiles five years later, you can replace them seamlessly without having to re-tile the entire room.