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AnswerRead the carton, then the rowTen percent is the cut allowance on these listingsKeep metres with metresUnderlayment and trim stay off the plank lineWorked example — 12 × 12 ft, 10% waste, 19.63 sq ft box
12 × 12 = 144 sq ft. With 10% waste, 144 × 1.10 = 158.4 sq ft. At 19.63 sq ft per box, 158.4 ÷ 19.63 = 8.069…, so the order rounds up to 9 boxes. The same 158.4 sq ft is 8 boxes at 22.17 sq ft per box (158.4 ÷ 22.17 = 7.144…) and 7 boxes at 24.54 sq ft per box (158.4 ÷ 24.54 = 6.454…). TrafficMaster Grey Oak at 23.91 sq ft per case is also 7 boxes: 158.4 ÷ 23.91 = 6.624….
| Room | Square feet | Square feet with 10% waste | Boxes at 19.63 ft² | Boxes at 22.17 ft² | Boxes at 24.54 ft² |
|---|---|---|---|---|---|
| 8 × 10 ft | 80 | 88 | 5 | 4 | 4 |
| 10 × 10 ft | 100 | 110 | 6 | 5 | 5 |
| 10 × 12 ft | 120 | 132 | 7 | 6 | 6 |
| 11 × 12 ft | 132 | 145.2 | 8 | 7 | 6 |
| 12 × 12 ft | 144 | 158.4 | 9 | 8 | 7 |
| 12 × 14 ft | 168 | 184.8 | 10 | 9 | 8 |
| 12 × 15 ft | 180 | 198 | 11 | 9 | 9 |
| 12 × 16 ft | 192 | 211.2 | 11 | 10 | 9 |
| 14 × 14 ft | 196 | 215.6 | 11 | 10 | 9 |
| 14 × 16 ft | 224 | 246.4 | 13 | 12 | 11 |
| 15 × 15 ft | 225 | 247.5 | 13 | 12 | 11 |
| 16 × 16 ft | 256 | 281.6 | 15 | 13 | 12 |
| 16 × 20 ft | 320 | 352 | 18 | 16 | 15 |
| 18 × 20 ft | 360 | 396 | 21 | 18 | 17 |
| 20 × 20 ft | 400 | 440 | 23 | 20 | 18 |
Flooring calculator
Laminate flooring calculator
Laminate floor coverage and whole-carton quantity with stated waste.
By Feroz Sheikh · Formula FLOOR-LAMINATE-001 v1.0.0 · Tested formula
FLOOR-LAMINATE-001v1.0.0Project inputs
Enter your measurements. Switching units converts the same project, including coverage and unit rates. Package yields keep the unit printed beside each field.
Calculated result
Laminate cartons to order
FLOOR-LAMINATE-001L × W × (1 + waste) ÷ stated coverage
Net floor area
Area including waste
Planning estimate, not engineering advice. Confirm site measurements and product specifications. Calculation limits.
This calculator returns whole laminate cartons from room length, width and the labelled square feet per carton. Formula FLOOR-LAMINATE-001 v1.0.0. Cut waste stays an input. Click-lock and glue-down do not share a waste default. Drop cartons into an estimate. Confirm the layout and dye lot before purchase.
- Measure finished length and width.
- Enter the carton coverage shown on the actual selected product.
- Use a visible allowance for cuts, pattern, room geometry and spare stock.
Add your project costs
Enter supplier prices and any labour, equipment or delivery costs. Pick a currency — badges, inputs, and totals follow.
Costs use the carton or square-foot rate you type. Construclytic does not fetch store prices. Underlayment, grout, thinset and labour stay companion lines.
Read the carton, then the row
Each column is one carton listing checked on 22 October 2026. Pergo Outlast+ Somerton Auburn at Home Depot, model LF000958, is 19.63 sq ft per case. Pergo Pro Silo Oak at Lowe's, model LF001098, is 22.17 sq ft per carton. Pergo XP+ Stone Haven Oak at Home Depot, model LF001076, is 24.54 sq ft per case; that page title rounds the same case to 24.5. TrafficMaster Grey Oak at Home Depot, model 360731-00375, is 23.91 sq ft per case, and its title rounds the case to 23.9.
A 12 × 12 ft room is 9, 8 or 7 boxes across those three columns. The 23.91 sq ft TrafficMaster case is also 7 boxes, because 158.4 ÷ 23.91 = 6.624…. The flooring planning guide is the hub for the other flooring counts. Replace any column with the coverage printed on the carton you will buy. The same whole-box method in Spanish is calculadora de suelo laminado and cuántas cajas de piso necesito.
Ten percent is the cut allowance on these listings
The Home Depot pages for Pergo Outlast+ Somerton Auburn and Pergo XP+ Stone Haven Oak both say to buy a minimum of 10% overage for cuts. The table applies that once: square feet × 1.10, then one round-up to a whole box. A second 10% after the boxes are already whole double-counts the same cuts.
A diagonal or irregular layout is outside that listing. Multiply square feet by 1.15 and divide by the same carton. Leave the 10% off when you do. A 10 × 12 ft room at 19.63 sq ft per box is 132 sq ft with 10% waste, and 132 ÷ 19.63 = 6.724…, which rounds up to 7 boxes. At 15% the area is 138 sq ft, and 138 ÷ 19.63 = 7.029…, which rounds up to 8 boxes. A 20 × 20 ft room at the same carton is 440 sq ft with 10% waste, and 440 ÷ 19.63 = 22.414…, which rounds up to 23 boxes. At 15% it is 460 sq ft, and 460 ÷ 19.63 = 23.433…, which rounds up to 24 boxes.
Keep metres with metres
A 12 × 12 ft room is 144 × 0.09290304 = 13.37803776 m². With 10% waste, 158.4 × 0.09290304 = 14.715841536 m². The 19.63 ft² case is 19.63 × 0.09290304 = 1.8236866752 m². Dividing those square metres still rounds up to 9 boxes. Enter the room and the carton in one unit system. Square metres divided by a square-foot coverage is a different number.
Underlayment and trim stay off the plank line
An attached pad does not turn the carton count into an underlayment order. Rolls use the flooring underlayment calculator and that roll's labelled coverage. Transitions, reducers and stair nosing are separate lines. Closets count only when they receive this plank. A hallway that turns is another rectangle, added once.
Do it in order
- Multiply the room length by the room width, in feet.
- Multiply by 1.10 for the straight-lay allowance on these listings, or by 1.15 for a diagonal or irregular layout.
- Divide by the square feet printed on the carton and round up to a whole box.
- Keep a separate count for a room that cannot share leftover planks from the same dye lot.
Planning boundary
This is a whole-box count for one rectangle and one labelled carton. It does not plan plank direction, expansion gaps, a dye lot, subfloor flatness or an installation warranty.
Sources checked
Each link supports the point named in the text. A citation is not a product endorsement or a price for your site.
- Home Depot — Pergo Outlast+ Somerton Auburn, model LF000958, 19.63 sq ft per case and a minimum 10% overage for cuts (opened 22 October 2026)
- Lowe's — Pergo Pro with WetProtect Silo Oak, model LF001098, 22.17 sq ft per carton (opened 22 October 2026)
- Lowe's — Pergo reply that the Silo Oak box contains 22.17 square feet (opened 22 October 2026)
- Home Depot — Pergo XP+ Stone Haven Oak, model LF001076, 24.54 sq ft per case; the title rounds that case to 24.5 (opened 22 October 2026)
- Home Depot — TrafficMaster Grey Oak, model 360731-00375, 23.91 sq ft per case; the title rounds that case to 23.9 (opened 22 October 2026)
How many boxes of laminate for a 12x12 room?
A 12x12 ft room needs 9 boxes of laminate flooring at 19.63 sq ft per box: 144 sq ft plus 10% waste is 158.4 sq ft, and 158.4 ÷ 19.63 rounds up to 9. At 22.17 sq ft per box the same room is 8 boxes, and at 24.54 sq ft per box it is 7.
How much extra laminate should I buy?
The Pergo Outlast+ Somerton Auburn and Pergo XP+ Stone Haven Oak listings on Home Depot, checked on 22 October 2026, say to buy a minimum of 10% overage for cuts. That is the 10% column. For a diagonal or irregular room, multiply the square feet by 1.15 instead. Leave the 10% off when you use 15%.
How many boxes of laminate for a 10x12 room?
A 10 × 12 ft room is 120 sq ft, or 132 sq ft with 10% waste. That is 7 boxes at 19.63 sq ft per box, and 6 boxes at either 22.17 or 24.54 sq ft per box. At 15% the 19.63 sq ft carton becomes 8 boxes.
How many boxes of laminate flooring for a 15x15 room?
A 15 × 15 ft room is 225 sq ft, or 247.5 sq ft with 10% waste. That is 13 boxes at 19.63 sq ft per box, 12 boxes at 22.17 sq ft per box, and 11 boxes at 24.54 sq ft per box.
How do I calculate laminate boxes from the room size?
Boxes = ceil(room sq ft × (1 + waste) / sq ft per box). A 12x12 ft room is 9, 8 or 7 boxes for the three cartons in the table. Read the coverage on the box you will buy, then use the laminate calculator when it is not one of those three.