Flooring Calculator
Enter your room dimensions and the coverage per box to get exactly how many boxes of flooring to buy.
Enter your measurements to see what to buy.
How to calculate it
Enter your room dimensions and the coverage per box to get exactly how many boxes of flooring to buy.
Source: Boxes = total area (with waste) ÷ coverage per box. Box coverage (ft²) is printed on the label, typically 15–25 ft².
A 12×12 ft room (144 ft²) with 10% waste = 158.4 ft² ÷ 20 ft² per box = 7.9 → 8 boxes.
Want the full step-by-step walkthrough? Read our How to Measure Square Footage for Any Project.
Flooring waste by layout
How much extra flooring you buy depends on the layout. This table shows the recommended waste allowance for common installation patterns, plus typical box coverage.
| Layout | Recommended waste | Notes |
|---|---|---|
| Straight-lay, simple room | 10% | Fewest cuts |
| Angled rooms, closets, hallways | 15% | More cuts around obstacles |
| Diagonal layout | 15–20% | Frequent angled cuts |
| Herringbone / intricate pattern | 20%+ | Most waste |
Box coverage is printed on the label — typically 15–25 ft² per box. Keep one unopened spare box for future repairs, since dye lots change between batches.
How to use this calculator
- Enter the room length and width in feet and inches.
- Enter the coverage per box printed on the flooring label (typically 15–25 ft²).
- Set the waste allowance based on your layout — 10% for straight-lay, more for patterns.
- Add the price per box for an optional material cost estimate.
Purchasing & waste guidance
- 10% is standard for straight-lay plank flooring in a simple rectangular room.
- 15% for rooms with lots of angles, closets or hallways.
- 20% or more for diagonal or herringbone layouts.
- Keep one spare box after installation for future repairs — dye lots change.
Waste factor guidance
- 10% for straight-lay plank in a simple rectangular room.
- 15% for rooms with many angles, closets or hallways.
- 20% or more for diagonal or herringbone layouts with frequent cuts.
Common mistakes to avoid
- Using the room’s square footage without waste — you’ll run short on the last row.
- Buying different dye lots — order all boxes at once and keep a spare for future repairs.
- Forgetting underlayment, transitions and baseboards, which are sold separately.
Assumptions & what’s included
- Room is a single rectangle; box coverage is the ft² printed on the label.
- Waste allowance covers cuts, defects and pattern waste.
- Price is per box and optional. Underlayment and transitions are sold separately.
Sources & references
- Box coverage (typically 15–25 ft²) is taken from the manufacturer label; enter the exact ft² printed on your flooring box.
- Waste allowances by layout (10% straight-lay, 15% angled, 20%+ herringbone) follow common manufacturer and National Wood Flooring Association guidance.
- Acclimation and underlayment recommendations follow typical manufacturer installation instructions.
Learn more about how every calculator works on our methodology page.
Frequently asked questions
How many boxes of flooring do I need for a 200 sq ft room?
A 200 ft² room with 10% waste needs 220 ft² of flooring. At 20 ft² per box that’s 11 boxes. The calculator works with any box coverage.
How much waste should I add for flooring?
10% for straight-lay plank in a simple room, 15% for rooms with many angles or closets, and 20%+ for diagonal or herringbone layouts.
Where do I find the coverage per box?
Box coverage in square feet is printed on the box label — typically 15–25 ft². Enter that number so the calculator gives an exact box count.
How much flooring do I need for a 12×12 room?
A 12×12 ft room is 144 ft². With a 10% waste allowance you need about 158 ft², which is 8 boxes at 20 ft² per box. Enter your exact box coverage for a precise count.
How many boxes of laminate flooring do I need for 300 sq ft?
300 ft² with a 10% waste allowance is 330 ft². At 20 ft² per box that is 17 boxes. Box coverage varies by product, so enter the exact ft² printed on your flooring label.
Do I need underlayment under my flooring?
Laminate flooring needs a separate underlayment for sound and moisture. Many vinyl plank products have an attached underlayment; hardwood is typically nailed to a subfloor. Budget for underlayment, transitions and baseboards separately from the flooring itself.
Related guides
Step-by-step project guides that use this calculator.