Calculate how many boxes of flooring you need for any room, with waste allowance for cuts and future repairs.
Quick answer
8 boxes (160 sq ft of material for a 144 sq ft room).
Room length × Room width = Room area
The calculator multiplies the room's length by its width to get the total floor area that needs covering.
Room area × Waste factor = Area with waste
The waste factor is applied as a percentage increase to the room area, giving you the total area of material you need to buy.
Area with waste ÷ Coverage per box = Boxes required
The total area is divided by the coverage of one box (printed on the packaging). The result is rounded up to the nearest whole box.
A 15 ft × 12 ft room with 20 sq ft per box:
15 × 12 = 180 sq ft
180 × 1.10 = 198 sq ft (with 10% waste)
198 ÷ 20 = 9.9 → 10 boxes
Purchase 10 boxes of flooring for this room.
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Laminate and vinyl plank are sold by the box, but rooms are never as rectangular as the floor plan suggests. Closets, angled walls, and the direction the planks run decide your real waste — the number on the box assumes a perfect world.
This calculator takes your room's square footage, adds a waste allowance for cutting, and divides by the coverage printed on your specific box. Box coverage varies (typically 18–24 sq ft), so check your product — the calculator lets you enter the exact figure.
| Room | Sq ft + waste | Boxes to buy |
|---|---|---|
| 10 × 10 ft | 110 | 6 |
| 12 × 12 ft | 159 | 8 |
| 15 × 20 ft | 330 | 17 |
Box coverage varies by product (18–24 sq ft is typical). Re-run the numbers with your box's figure.
A 12 ft × 12 ft room, boxes covering 20 sq ft each, 10% waste:
8 boxes (160 sq ft of material for a 144 sq ft room).
1. Choose your unit system — Imperial (feet) or Metric (meters).
2. Enter the length and width of the room you are flooring.
3. Enter the coverage per box — this is printed on the flooring packaging in square feet or square meters.
4. Select a waste factor — 10% is recommended for standard layouts.
5. Click Calculate to see how many boxes of flooring you need.
The calculator first determines the room area by multiplying the room length by the room width. A waste factor is then applied to account for cuts, mistakes, and future repairs.
The resulting area is divided by the coverage per box to determine how many boxes you need. The result is always rounded up to the nearest whole box, since you cannot purchase partial boxes.
Flooring installations always produce waste. Planks and tiles must be cut to fit along walls and around obstacles, and some pieces will be unusable after cutting. A waste factor ensures you have enough material to complete the job.
Keeping extra boxes also means you have matching material on hand for future repairs. Flooring styles and dye lots can be discontinued, making exact matches difficult to find years later.
Suppose your room is 15 feet by 12 feet, and each box of flooring covers 20 square feet.
Room area: 15 × 12 = 180 square feet.
With 10% waste: 180 × 1.10 = 198 square feet.
Boxes required: 198 ÷ 20 = 9.9, rounded up to 10 boxes.
You should purchase 10 boxes of flooring for this room.
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