Laminate Flooring Calculator
The short answer for a 12×12 room: 9 boxes of Pergo Outlast+ - Sandy Cove Oak (LF001012) (19.63 sq ft per carton) at the standard 10% waste allowance, plus 2 rolls of underlayment. Enter your room and your flooring below for your number.
Materials list
| Item | Quantity |
|---|---|
| Laminate flooring — Pergo Outlast+ - Sandy Cove Oak (LF001012) (19.63 sq ft/carton) | 9 boxes |
| Underlayment (100 sq ft rolls) | 2 rolls |
How it works
Room area is length times width. The layout waste allowance (10% standard, 15% diagonal) is added, the result is divided by the coverage printed on your box, and boxes round up — stores sell whole boxes. Underlayment comes in standard 100 sq ft rolls and rounds up the same way. Coverage figures here are real products from manufacturer spec sheets, not a guessed "typical box": there is no standard box size, and coverage varies within a single product line by plank width.
Sources: Manufacturer spec/sell sheets (Mohawk RevWood and SolidTech sell sheets; COREtec/USFloors VV488 spec sheet) and Home Depot product pages' manufacturer specification sections (Pergo, TrafficMaster, Lifeproof, Bruce, Shaw). 14 verified products. Full evidence: research-data/flooring.md Retrieved 2026-10-24. Waste allowances: Power Dekor Engineered Hardwood Floating Installation Instructions; retailer overage guidance on the product listings above.
Questions
How many boxes of laminate do I need for a 12×12 room?
A 12×12 room is 144 sq ft. With the standard 10% waste allowance that is 158.4 sq ft to cover, so at 19.63 sq ft per carton (Pergo Outlast+ - Sandy Cove Oak (LF001012)) you need 9 boxes, plus 2 rolls of underlayment.
Is there a standard laminate box size?
No. Verified carton coverage in our dataset runs from 13.74 to 36.64 sq ft per carton and changes within a product line by plank width — always check the coverage printed on your box and enter it here.
How much extra flooring should I buy for a diagonal layout?
Plan on 15% extra for diagonal or other special patterns, against 10% for a standard straight layout. Power Dekor's installation instructions allow 7–10% for waste on standard installs and 10–15% additional material for diagonal or formal patterns.
Do I need underlayment with laminate flooring?
Laminate over a subfloor without an attached pad needs a separate underlayment or moisture barrier. Retail rolls are a standard 100 sq ft (TrafficMaster and Roberts listings), so a 144 sq ft room takes 2 rolls.