Deck Board Calculator
Estimate decking boards for your deck — rows across the joists, linear feet, and full boards — with the board gap, pattern waste, fasteners, U.S. pricing, a material comparison, and a downloadable PDF.
Board coverage assumes boards run the deck length across the joists. Prices use 2024-2025 U.S. figures and vary by region and grade. For planning purposes only.
| Material | $ / lf | Linear Ft | Board Cost |
|---|
Boards only, for your 437 linear feet (with waste) at typical U.S. prices.
How to use the deck board calculator
Three quick steps turn a deck’s dimensions into a full board list — rows across the joists, linear feet, and whole boards to buy — with pattern waste, fasteners, U.S. pricing, a material comparison, and a downloadable PDF.
Enter your deck
Type the deck length × width, or edit the area directly for an L-shape or multi-level deck.
Pick the board
Choose material, board length, width and gap, and a layout pattern that sets the waste.
Add framing & fasteners
Set joist spacing, screws or hidden clips, and optional install labor.
Read it & save a PDF
Get boards, linear feet, and a full cost breakdown to download.
How the board count is calculated
Start with the coverage width of one board — the board plus its gap — stack rows across the deck width, run each row the deck length, add waste, then divide into whole boards. Here is the exact math.
Worked example — 16 × 12 ft deck, 5.5 in boards, 3/16 in gap, 16 ft boards, straight pattern
Coverage width: 5.5 + 0.1875 = 5.6875 in
Rows: ⌈(12 × 12) ÷ 5.6875⌉ = ⌈144 ÷ 5.6875⌉ = 26 rows
Coverage lf: 26 × 16 = 416 lf
With waste: 416 × 1.05 ≈ 437 lf
Boards: ⌈437 ÷ 16⌉ = 28 boards
Board cost: 437 × $2.00 ≈ $874
28 boards + face screws, roughly $900 in decking materials at ~$4.90 / sq ft.
Same deck, same boards — the pattern alone swings the buy from 28 to 32 boards. Every angled cut leaves an offcut, so herringbone and diagonal need the biggest waste cushion.
Deck board coverage, pattern & cost charts
Handy lookups for the questions people ask most — board coverage, pattern waste, materials, boards by area, and typical U.S. costs. Everything starts from the deck area: length times width, boards running across the joists.
| Material | ~$ / lf | Upkeep | Best for |
|---|---|---|---|
| Pressure-treated pine | $2.00 | Seal periodically | Budget builds, big decks |
| Cedar | $2.75 | Seal periodically | Warm look, light weight |
| Composite | $3.75 | Low | Low-maintenance living space |
| PVC / vinyl | $4.50 | Very low | Wet climates, pools |
| Tropical hardwood (ipe) | $6.00 | Oil to keep color | Premium, long-life decks |
Prices are per linear foot of decking, boards only. Composite, PVC, and hardwood usually run on 12 in joists and often use hidden clips.
| Pattern | Typical waste | Notes |
|---|---|---|
| Straight | 5% | Boards run across the joists |
| Picture frame | 12% | Border board plus mitered corners |
| Diagonal 45° | 15% | Angled cuts; often 12 in joists |
| Herringbone | 20% | Most cuts and offcuts |
Waste is a cushion for cuts, offcuts, and defects — the more angles in the layout, the more board you throw away.
| Board width | Gap | Coverage width | Rows per 12 ft |
|---|---|---|---|
| 5.5 in | 1/8 in | 5.625 in | 26 |
| 5.5 in | 3/16 in | 5.6875 in | 26 |
| 5.5 in | 1/4 in | 5.75 in | 26 |
| 3.5 in | 3/16 in | 3.6875 in | 40 |
Rows across a 12 ft (144 in) width, rounded up. Narrower boards mean more rows — and more linear feet — for the same deck.
| Deck size | Area | Rows | Linear ft | 16 ft boards |
|---|---|---|---|---|
| 10 × 10 ft | 100 sf | 22 | 231 | 15 |
| 12 × 12 ft | 144 sf | 26 | 328 | 21 |
| 16 × 12 ft | 192 sf | 26 | 437 | 28 |
| 16 × 16 ft | 256 sf | 34 | 571 | 36 |
| 20 × 16 ft | 320 sf | 34 | 714 | 45 |
Rows stack across the deck width; linear feet is rows times the deck length, plus waste. Boards round up to whole 16-footers.
| Fastener | Rule of thumb | Notes |
|---|---|---|
| Face screws | ~350 / 100 sq ft | Two per board at each joist |
| Hidden clips | ~175 / 100 sq ft | Grooved boards, incl. starter clips |
| Joist spacing | 16 in (wood) / 12 in (composite) | Follow the board span rating |
| Board gap | 1/8–1/4 in | Drainage and expansion |
Rules of thumb — actual counts vary with joist spacing, board length, and layout. Buy a little extra so you don’t stop mid-row.
| Component | Typical cost | Notes |
|---|---|---|
| Pressure-treated decking | $1.50–$2.50 / lf | Budget standard |
| Composite decking | $3.00–$5.00 / lf | Low-maintenance |
| Hardwood (ipe) decking | $5.00–$8.00 / lf | Premium, dense |
| Deck screws (box) | $8–$40 | 350–1,750 count |
| Hidden clips (box) | $20–$45 | ~90 clips per box |
| Installation labor | $8–$15 / sq ft | Surface install only |
Planning ranges only. Prices swing with region, grade, and quantity, and exclude the substructure, footings, and railing.
Deck boards run the length of the deck and stack across the width, crossing the joists at right angles. The calculator counts the rows and adds up their linear feet.
- Rows — each covers the board width plus the gap; they stack across the deck width.
- Gap — about 1/8 to 1/4 in between rows for drainage and expansion.
- Joists — run under and across the boards, 16 in OC for wood, 12 in for composite.
- Fasteners — face screws or hidden clips at every board-over-joist crossing.
Everything the calculator works out
One deck, entered any way you like, comes back as a complete surface list — boards, linear feet, and fasteners — priced out.
Key figures behind deck board estimating
Built for anyone laying a deck surface
From a small backyard platform to a wraparound deck, the same calculator turns dimensions into boards, linear feet, and a materials price.
Surfacing a backyard deck and needs the boards, linear feet, and fastener count.
- Enter the deck, get boards
- Match the pattern to the waste
- Buy a few spares for cuts
Turning deck dimensions into boards, fasteners, and a price fast when quoting surface work.
- Enter total area for odd shapes
- Compare PT vs composite vs ipe
- Add install labor per sq ft
Weighing material and pattern against labor before booking the job.
- See cost per square foot
- Split boards from fasteners
- Save the PDF to shop quotes
7 tips for estimating & laying deck boards
Small habits keep your board count right and your surface flat, whether you’re building a small platform or a whole wraparound.
Deck board calculator FAQ
The coverage, pattern, spacing, and cost questions people ask most.
Count the rows that stack across the deck width, then multiply by the deck length for linear feet. Each row covers the board width plus the gap — a 5-1/2 inch board with a 3/16 inch gap covers about 5.7 inches, so a 12 foot wide deck needs 26 rows.
For a 16 by 12 foot deck that’s about 416 linear feet, or roughly 437 feet once you add 5 percent waste — 28 boards at 16 feet each. Diagonal and picture-frame patterns waste more, so buy a few extra.
Linear feet is rows times deck length. First find the coverage width of one board — board width plus the gap — then divide the deck width by it and round up to get the number of rows.
Multiply rows by the deck length in feet for coverage linear feet, then add waste for the pattern. A 16 by 12 foot deck works out to 26 rows times 16 feet, about 416 linear feet before waste.
Leave about 1/8 to 1/4 inch between boards for drainage and expansion. A 3/16 inch gap is a common middle ground for wood installed dry.
Wet pressure-treated boards shrink as they dry, so gap them tighter — sometimes almost butted — while kiln-dried, composite, and PVC boards keep the gap you set. Follow the board maker’s spacing guidance.
Pressure-treated pine is the budget standard but needs sealing and moves as it dries. Cedar is naturally rot-resistant, light, and warm-toned but still needs upkeep.
Composite and PVC are low-maintenance and dimensionally stable at a higher price, and usually run on 12 inch joists with hidden clips. Tropical hardwood like ipe is extremely dense and durable, but you pre-drill it and pay a premium.
Straight boards run across the joists waste the least — about 5 percent for cuts and defects. A picture-frame border adds around 12 percent.
Diagonal 45-degree layouts waste roughly 15 percent because every board is cut on an angle, and herringbone can reach 20 percent. Angled patterns also often need tighter 12 inch joist spacing to support the ends.
16 inches on center is typical for straight-laid wood and many composites. Step down to 12 inches on center for diagonal layouts and for composite or PVC boards, which sag more than wood.
Always check the board maker’s span rating — it sets the maximum joist spacing for your specific product and layout, and angled boards effectively span farther between joists.
Grooved composite and PVC boards are made for hidden clips that seat in the side groove, leaving a fastener-free surface. Plan on about 175 clips per 100 square feet, including starter clips.
Solid boards without a groove get face screws — roughly two per board at each joist, about 350 screws per 100 square feet. Match the fastener to your board and framing.
Decking boards alone run from around $2 per linear foot for pressure-treated up to $6 or more for tropical hardwood, so material cost swings widely with the board you pick.
Installation labor typically adds about $8 to $15 per square foot on top of materials. This calculator covers the deck surface — boards and fasteners — not the substructure, footings, or railing.
General Estimating Notice: This calculator estimates deck surface boards, linear feet, fasteners, and optional install labor from your deck dimensions, board size, gap, and layout pattern, using standard coverage figures. It assumes boards run the deck length across the joists; coverage width is board width plus the gap, and rows round up. Pattern waste is a rule of thumb — actual use varies with layout, board length, offcuts, and defects. This covers the deck surface only — not the substructure, joists, beams, posts, footings, railing, or stairs. Follow the board maker’s span rating, fastening, and gapping guidance and your local building code. Prices use 2024–2025 U.S. figures and vary by region and grade. For planning purposes only.