144 sq ft · 10% · 20 sq ft box
Input
12×12 roomOutput
8 boxes158.4 sq ft ÷ 20 = 7.92 → 8 boxes.
Flooring quantity is **floor area × (1 + waste%)**, rounded up to whole cartons using **sq ft per box** from the manufacturer label.
**Formula:**
Sq ft to order = Net floor sq ft × (1 + waste% / 100)
Boxes = ceil(Sq ft to order ÷ Sq ft per box)
**Example — 12×12 ft (144 sq ft), 10% waste, 20 sq ft/box:**
144 × 1.10 = 158.4 sq ft → **8 boxes** (160 sq ft)
**Example — 300 sq ft living room, 10% waste, 20 sq ft/box:**
330 sq ft → **17 boxes**
Net floor area times waste buffer, divided by carton coverage for box count.
Formula
sq_ft_order = net_sq_ft × (1 + waste%); boxes = ceil(sq_ft_order / box_sq_ft)Tap 12×12 bedroom, 15×20 living, or enter floor sq ft on the main form.
LVP, laminate, diagonal, or herringbone presets set waste % on the main form.
Read from the flooring carton — often 15–30 sq ft for click-lock planks.
Results show flooring to order, base area, carton count, and purchase guide.
Use Paint Calculator for walls in the same room remodel.
Input
12×12 roomOutput
8 boxes158.4 sq ft ÷ 20 = 7.92 → 8 boxes.
Input
Living roomOutput
17 boxes330 ÷ 20 = 16.5 → 17 boxes.
Input
Open conceptOutput
37 boxes880 ÷ 24 = 36.67 → 37 boxes.
Input
Closet / entryOutput
3 boxes44 ÷ 15 = 2.93 → 3 boxes.
Common real-world scenarios where this tool saves time.
144 sq ft + 10% waste, 20 sq ft boxes = 8 cartons.
330 sq ft with waste, 20 sq ft boxes = 17 cartons.
Use 20% waste preset — cuts at walls and pattern joints add scrap.
Step-by-step chains that connect related tools for common tasks.
| Layout | Waste % |
|---|---|
| Straight plank | 10% |
| Diagonal | 15% |
| Herringbone | 15–20% |
| Sq ft / box | Cartons needed |
|---|---|
| 15 sq ft | 12 boxes |
| 18 sq ft | 10 boxes |
| 20 sq ft | 8 boxes |
| 24 sq ft | 7 boxes |
Flooring uses **floor** sq ft inside walls — not wall surface area.
End-row cuts always waste planks — **10% minimum** for straight layouts.
Buy all cartons at once — production runs vary in shade.
Advertisement
144 sq ft floor area. With 10% waste (158 sq ft) and 20 sq ft boxes: 8 cartons.
10% for straight LVP/laminate, 15% for diagonal, 15–20% for herringbone or complex layouts.
Divide total sq ft (with waste) by sq ft per box on the carton and round up.
Manufacturer coverage per carton — often printed on the box end flap (15–30 sq ft common).
Most floating floors require underlayment — calculate rolls separately; not included in this calculator.
Use Tile Calculator for ceramic/porcelain sq ft and box count — tile needs different waste math for wet areas.
Yes — enter floor sq ft and sq ft per carton from your hardwood supplier.
Length × width inside walls, or use total sq ft mode. Subtract permanent islands only if not covering them.
Switch to metric — enter m² and sq ft per box (or convert box label to m²).
Plank cuts at walls always waste material — partial cartons are not sold.
Floor dimensions stay on your device — no upload to EverydayTools servers.
Estimates only — verify with manufacturer install guide for your specific product.
Part of Calculator Tools
More free tools for the same workflow.
Free paint calculator: enter wall area, coverage from your can, and coats → gallons or liters to buy. Room presets, door/window deductions, waste buffer, can round-up. Runs locally in your browser.
Free tile calculator: floor area + tile size → tiles and boxes to buy with waste buffer. Bath and kitchen presets, 10–15% waste, imperial and metric. Runs locally in your browser.
Advertisement
Reviewed on 2026-06-27.
Click-lock plank — straight lay
Read from the flooring box — often 15–30 sq ft for LVP and laminate.