Flooring Calculator — How Much Flooring Do I Need?
Calculate square footage and boxes of flooring needed for any room with waste percentage.
Your Results
7
Boxes Needed
132.0
sq ft (with waste)
120.0
Room sq ft
sq ft & Boxes at Different Waste Factors
| Waste % | sq ft Needed | Boxes |
|---|---|---|
| 0% waste | 120.0 | 6 |
| 5% waste | 126.0 | 7 |
| 10% waste | 132.0 | 7 |
| 15% waste | 138.0 | 7 |
| 20% waste | 144.0 | 8 |
Formula
Formula:
Room Area = Length × Width
sq ft Needed = Room Area × (1 + Waste% ÷ 100)
Boxes = ceil(sq ft Needed ÷ sq ft per Box)
Worked Example
Example: 14×18 ft room, 10% waste, 22 sq ft/box.
Room area = 252 sq ft; With waste = 277.2 sq ft; Boxes = ceil(277.2÷22) = 13 boxes
Frequently Asked Questions
How much flooring for a 12×15 room?
180 sq ft + 10% waste = 198 sq ft. At 20 sq ft/box = 10 boxes.
How do I find sq ft per box?
Check the box label for 'Coverage: XX sq ft'. Common: laminate 15–22, LVP 18–25, hardwood 12–20 sq ft.
How much waste to add?
Straight lay: 5–8%. Diagonal or herringbone: 10–15%. Irregular rooms: 10–15%.
Can I return unused boxes?
Many stores accept unopened returns within 90 days. Keep 1 box for future repairs.
Do I measure to wall or baseboard?
Measure to the wall. Flooring installs under or next to the baseboard including a 1/4-inch expansion gap.