What waste covers
Waste is extra material beyond your measured room area. It pays for cutoffs at walls, mistakes, broken tile, and future repairs — not for unmeasured closets you forgot.
Starting percentages
Our calculator defaults to 10% laminate and 15% tile. Increase the slider if your layout is complex.
- Laminate / LVP straight lay: 10% typical
- Laminate diagonal or many doorways: 12–15%
- Ceramic/porcelain tile: 15% standard; 18–20% for herringbone or large format
- Carpet: 10% for plain carpet; 15%+ for patterned or berber
- Stairs and landings: measure separately and add 15% — lots of cuts
When extra waste saves a second trip
- Open floor plan with continuous run through multiple doorways
- Large format tile (fewer pieces per box — one break hurts)
- Discontinued color you cannot reorder
- First-time DIY installer
Worked example: 320 sq ft living + hallway
320 sq ft × 10% waste = 352 sq ft to buy for straight laminate. At 22 sq ft per box → 16 boxes. For 15% tile waste on the same area: 368 sq ft ÷ 15 sq ft per box ≈ 25 boxes. Use the waste calculator to toggle percentages without redoing math.