How Much Hardwood Flooring for a 16×20 Room?
A 16×20 ft room is 320 sq ft. With a 10% waste factor, you need 352.0 sq ft of hardwood flooring — that's 18 boxes at 20 sq ft per box. Installed cost estimate: $2,560–$6,400.
Area with 10% waste
352.0 sq ft
Base sq ft
320
Boxes needed
18
Installed cost est.
$2,560–$6,400
Hardwood tip
Hardwood waste is typically 10% for straight-lay, and 15% for diagonal or herringbone patterns. Solid hardwood also requires extra material for matching plank lengths at doorways and transitions — some installers use 12–15% as their standard allowance. Acclimate hardwood for 48–72 hours in the room before installation.
Box count at 20 sq ft/box with 10% waste. Adjust dimensions, waste %, or box coverage in the full calculator →
How This Calculator Works
How we calculated this page
16 ft × 20 ft = 320 sq ft × 1.10 waste = 352.0 sq ft ÷ 20 sq ft/box = 17.60 → 18 boxes
The standard flooring formula — and the same math the full calculator uses:
Room area Sq ft = Length × Width Apply waste Sq ft with waste = Sq ft × (1 + Waste% ÷ 100) Box count Boxes = ⌈ Sq ft with waste ÷ Box coverage ⌉ Default waste by layout Straight lay: 10% Diagonal: 15% Herringbone: 20%
The waste factor covers edge cuts at walls, boards damaged during installation, and a small reserve for future repairs. Diagonal and herringbone layouts waste more material because planks meet walls at angles — those offcuts are usually too short or narrow to reuse.
Box counts always round up — you cannot purchase a fraction of a box. "Box coverage" is the usable square footage per box, printed on the box label. This may differ slightly from the total plank area due to tongue-and-groove overlap.
Worked Example — 16×20 ft Room, 10% Waste, 20 sq ft/box
Area: 16 × 20 = 320 sq ft
With 10% waste: 320 × 1.10 = 352.0 sq ft
Boxes: ⌈ 352.0 ÷ 20 ⌉ = ⌈ 17.60 ⌉ = 18 boxes (covers 360 sq ft total)
Common Project Sizes
10% waste factor, 20 sq ft per box. Adjust in the full calculator for your specific product.
| Room Size | Base Sq Ft | With 10% Waste | Boxes (20 sq ft/box) | Installed Cost Est. |
|---|---|---|---|---|
| 10×10 ft | 100 | 110.0 | 6 | $800–$2,000 |
| 10×12 ft | 120 | 132.0 | 7 | $960–$2,400 |
| 10×14 ft | 140 | 154.0 | 8 | $1,120–$2,800 |
| 12×12 ft | 144 | 158.4 | 8 | $1,152–$2,880 |
| 12×14 ft | 168 | 184.8 | 10 | $1,344–$3,360 |
| 12×16 ft | 192 | 211.2 | 11 | $1,536–$3,840 |
| 14×14 ft | 196 | 215.6 | 11 | $1,568–$3,920 |
| 14×16 ft | 224 | 246.4 | 13 | $1,792–$4,480 |
| 15×15 ft | 225 | 247.5 | 13 | $1,800–$4,500 |
| 16×20 ft | 320 | 352.0 | 18 | $2,560–$6,400 |
How to Use This Calculator
The values above are pre-calculated for a 16×20 ft room with Hardwood flooring at a 10% straight-lay waste factor and 20 sq ft per box. The 18 box count rounds up because you cannot buy a fraction of a box — 18 boxes covers 360 sq ft total.
Box coverage varies by product — check the label or spec sheet for your specific flooring. Use the full flooring calculator to enter your exact box coverage, adjust the waste percentage for diagonal or herringbone layouts, or combine multiple rooms into one order.
The installed cost estimate ($2,560–$6,400) reflects contractor pricing in most US markets in 2024–2025 for 16×20 ft. DIY installation reduces cost by 30–50% — materials typically represent 40–60% of the installed price.
Frequently Asked Questions
How much hardwood flooring do I need for a 16×20 room?
A 16×20 ft room is 320 sq ft. With a 10% waste factor for straight-lay installation, you need 352.0 sq ft of hardwood — that's 18 boxes at 20 sq ft per box.
How much does it cost to install hardwood flooring in a 16×20 room?
Installed cost for hardwood flooring in a 16×20 ft room typically runs $2,560–$6,400 depending on your region, the specific product, and labor rates. Materials alone represent roughly 40–60% of the installed price.
How do I calculate how many boxes of flooring I need?
Multiply the room length by the width to get the base square footage. Add your waste percentage (10% for straight-lay, 15% for diagonal) to get the total square footage to order. Divide by the box coverage printed on the product label, then round up to the nearest whole box. This page does all of that math for you.
Should I order extra flooring?
Always keep one unopened box after installation. Flooring is manufactured in production lots — the color and texture can differ subtly between runs even for the same SKU. A future repair using a board from a different lot may not match. Confirm all boxes share the same lot number before you leave the store.
Do I need underlayment with my flooring?
Underlayment is calculated separately — buy it to cover the same base square footage as your floor (no waste factor needed). Some vinyl plank products come with pre-attached underlayment, so check your product before buying a separate roll. This page is for flooring material only.
How accurate is the 10% waste factor?
Ten percent covers standard straight-lay installations in rectangular rooms: wall cuts at every row, a few damaged boards, and a small repair reserve. Use 15% for diagonal layouts, 20% for herringbone or chevron, and add 5% for rooms with lots of obstacles (islands, columns, odd corners). The full flooring calculator lets you adjust the waste field to any percentage.
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