Whole-project calculator
Deck Material Calculator
Plan decking, framing, footings, guardrails, stairs, and hardware for a residential deck with region-aware material pricing. For single-level rectangular decks.
2D plan
Deck framing plan
Schematic top view of a 16 ft x 12 ft attached deck using the calculator default ledger + one beam + cantilever support layout, with 3 footings, and a 4 ft stair opening on the front edge. Preview geometry mirrors the current joist, beam, post, guard, and stair layout, but it remains a planning model rather than permit-ready detailing.
3D assembly
Interactive 3D
Rotate the model, toggle assemblies, and inspect labeled material callouts.
Material theme
Classic pressure-treated
Pressure-treated framing and deck boards with the mainstream residential starter palette.
Material tier comparison
Price this same deck with each board material, using your current inputs.
Inputs changed — compare again to see updated totals.
Totals marked * are priced-subtotal-only; some lines in that plan have no live price yet.
This comparison uses our reference prices, so your own prices are not applied.
These totals include the estimated labor for each option.
Plan details & review
More project facts 25
Planning assumptions
9Material quantities and planning BOM for Deck Material Calculator based on selected inputs.
Planning assumptions · 9
- This calculator covers single-level rectangular deck layouts.
- Joist, beam, and post sizing uses conservative planning bands rather than engineered span tables.
- Guard kits assume 36 in residential sections sold in 6 ft modules.
- Concrete quantities are expressed as 80 lb bags at 45 bags per cubic yard.
- Prices may mix retailer snapshots, reference prices, regional estimates and your overrides. Price sources and dates are listed in each material row's details. A state-level estimate is not a ZIP-specific store price.
- Preview geometry mirrors the current joist, beam, post, guard, and stair layout, but it remains a planning model rather than permit-ready detailing.
- This plan assumes a code-compliant ledger connection to the house. Have the flashing, fastener pattern, and band-joist condition verified on site - requirements vary by jurisdiction, and the ledger is where attached decks most often fail.
- Support positions were adjusted while retaining the selected member sizes and counts. DCA6 reference dimensions were rechecked; field loads, connections, footing reactions and local approval still need professional review.
- DCA6 dimensional comparisons assume No. 2 Southern Pine, wet service, 40 psf live load and 10 psf dead load. Site loads, connections, footings and local approval are not verified; hot tubs and snow loads above 40 psf are outside this comparison.
Not included / Trade review
3Ledger / stairs / guards
-
Open decisions / checks
1- Check if your local jurisdiction requires a building permit for this deck size or height before starting construction.
-
Estimate boundaries
2- Use the BOM for planning, but confirm ledger attachment, flashing, guard triggers, and stair conditions before shopping. Final stair landing pad, door-swing clearance, and site grading stay outside the default stair package.
- Ledger attachment, flashing, fastener pattern, and existing band-joist condition still need field verification.
How pricing works
Where each price comes from, when it was checked, and what the formulas assume.
- Source: Retailer price
- Region: Calculator default pricing
- Price as of: 06/05/2026 – 10/19/2026
- Calculator default pricing is being used because no supported pricing region was requested.
- Frost basis: Calculator default @ 36 in.
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Material list
Your build list
Each line shows a purchase quantity, a coverage amount, or a planning allowance - the line says which. Check pack sizes and your site conditions before you order.
| Material | Assembly | Unit | Qty | Unit price | Total | Store |
|---|---|---|---|---|---|---|
|
Pressure-treated 5/4x6 deck boards
5/4x6 | Stock 16 ft | Pressure TreatedActual 1 in thick x 5.5 in wide
|
decking | board |
29
|
$14.58 |
$422.82 | |
Quantity basis 16 ft run ÷ 16 ft stock, rounded up: 1 stock pieces per row. Offcuts are not reused across rows.
|
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|
Pressure-treated fascia boards
5/4x6 | Stock 16 ft | Pressure TreatedActual 1 in thick x 5.5 in wide
|
decking | board |
3
|
$14.58 |
$43.74 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
||||||
|
Exterior deck screws
Pressure Treated
|
deck fastening | box |
3
|
$29.97 |
$89.91 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
2x8 deck joists
2x8 | Stock 12 ftActual 1.5 in thick x 7.25 in wide
|
deck framing | board |
13
|
$19.78 |
$257.14 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
2x8 rim boards
2x8 | Stock 12 ftActual 1.5 in thick x 7.25 in wide
|
deck framing | board |
6
|
$19.78 |
$118.68 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
2-2x10 beam members
Note: Quantity counts individual members required to build each beam line.2-2x10 | Stock 16 ft | Pressure Treated
|
deck framing | board |
2
|
$37.38 |
$74.76 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
6x6 support posts
6x6 | Stock 8 ft | Pressure Treated
|
deck framing | post |
3
|
$36.58 |
$109.74 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
2x8 blocking pieces
Note: Linear-length estimate only; verify cuts and saw kerf before ordering. Offcuts from other materials are not reused.2x8 | Stock 12 ftActual 1.5 in thick x 7.25 in wide
|
deck framing | each |
2
covers 14.5 linear ft
|
$19.78Not editable: priced as a package | $39.56 | |
Quantity basis 14.5 linear ft needed → buy 2 pieces, 12 linear ft each.
|
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|
2x8 ledger boards
2x8 | Stock 16 ft | Pressure Treated
|
ledger | board |
1
|
$25.78 |
$25.78 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
Ledger flashing
10 ft flashing | Stock 10 ft
|
ledger | piece |
2
|
$21.48 |
$42.96 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
Ledger structural fasteners
Note: Installed-count allowance only; not a permit-ready ledger schedule. Verify fastener spacing, substrate, flashing, and local code before procurement.1/2 in x 6 in structural fastener
|
ledger | pack |
2
covers 14 fastener
|
$26.92Not editable: priced as a package | $53.84 |
Home Depot View product → 06/05/2026 — price may have changed - verify before ordering |
Quantity basis 14 fasteners needed → buy 2 packs (12 fasteners per pack).
|
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|
Lateral-load connectors
lateral load connector pair
|
ledger | pair |
2
|
$35.00 |
$70.00 |
Home Depot View product → 07/20/2026 — price may have changed - verify before ordering |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
80 lb concrete bags
Note: Footing depth uses the greater of user input or the state-level frost floor, and footing diameter uses a tributary-area planning rule with post-size minimums.80 lb bag
|
deck footings | bag |
22
|
$5.98 |
$131.56 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
36 in residential guard kits
Note: Guard auto-triggers at or above 30 in walking-surface height and uses side-specific exposure selection.36 in x 6 ft | 6 ft section
|
guard | section |
6
|
$129.00 |
$774.00 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
Guard post hold-down connectors
guard post hold-down tie
|
guard | tie |
9
|
$11.98 |
$107.82 | |
Quantity basis Sold individually: buy 9.
|
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|
2x12 stair stringers
2x12 | Stock 12 ft | Pressure Treated
|
stairs | stringer |
3
|
$40.48 |
$121.44 | |
Quantity basis Sold individually: buy 3.
|
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|
Pressure-treated stair tread boards
5/4x6 | Stock 8 ft | Pressure TreatedActual 1 in thick x 5.5 in wide
|
stairs | board |
5
|
$8.37 |
$41.85 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
1x8 stair riser boards
1x8 | Stock 8 ft | Pressure Treated
|
stairs | board |
3
|
$8.48 |
$25.44 |
Home Depot View product → 07/06/2026 — price may have changed - verify before ordering |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
Stair handrail kits
8 ft stair handrail kit | 8 ft section
|
stairs | section |
1
|
$196.80 |
$196.80 |
Arbor Home View product → 08/09/2026 — price may have changed - verify before ordering |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
6x6 post bases
Fits 6x6 posts
|
deck hardware | base |
3
|
$27.00 |
$81.00 | |
Quantity basis Sold individually: buy 3.
|
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|
6x6 beam-to-post connectors
6x6 beam cap | Fits 6x6 posts
|
deck hardware | connector |
3
|
$17.20 |
$51.60 |
Home Depot View product → 06/05/2026 — price may have changed - verify before ordering |
Quantity basis Sold individually: buy 3.
|
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|
2x8 joist hangers
Fits 2x8 joists
|
deck hardware | hanger |
13
|
$2.94 |
$38.22 | |
Quantity basis Sold individually: buy 13.
|
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|
Joist hanger fastener boxes
connector fastener box
|
deck hardware | box |
1
|
$25.21 |
$25.21 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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Prices checked on the date shown; local price and stock may vary. Some links in this calculator are affiliate links. BuildListCalc may earn a commission at no extra cost to you.
Estimated materials total$2,943.87
Project material guide
2026 U.S. Deck Material Guide
Switch between tabs to compare nominal sizes, actual sizes, common uses, and planning rules for this project.
Decking Boards
Key takeaway: 5/4x6 pressure-treated decking remains the default homeowner assumption in this estimator, while composite and PVC use a dedicated 1x6 profile path. Coverage width below assumes a typical 1/8 in board gap. "5/4" is a nominal thickness - the board measures about 1 inch thick.
| Nominal Size | Actual Thickness | Actual Width | Effective Coverage Width @ 1/8 in Gap | Common Use | Recommended Joist Spacing |
|---|---|---|---|---|---|
| 5/4x4 | 1 in | 3.5 in | ~3.63 in | Narrow decks and walkways | 16 in o.c. |
| 5/4x6 | 1 in | 5.5 in | ~5.63 in | Most common residential deck board | 16 in o.c. |
| 5/4x8 | 1 in | 7.25 in | ~7.38 in | Wide deck boards | 16 in o.c. |
| 2x6 | 1.5 in | 5.5 in | ~5.63 in | Heavy-duty decking | 24 in o.c. |
| 1x6 | 1 in | 5.5 in | ~5.63 in | Composite and PVC deck boards | 16 in o.c. |
Joists and Built-Up Beams
| Nominal Size | Actual Thickness | Actual Width | Typical Use | Conservative Planning Span |
|---|---|---|---|---|
| 2x6 | 1.5 in | 5.5 in | Deck joists | 9'-11" |
| 2x8 | 1.5 in | 7.25 in | Deck joists | 12'-13' |
| 2x10 | 1.5 in | 9.25 in | Deck joists | 15'-16' |
| 2x12 | 1.5 in | 11.25 in | Deck joists | 18' |
| 2-2x8 | 3 in | 7.25 in | Common beam | 7 ft 6 in post spacing |
| 2-2x10 | 3 in | 9.25 in | Medium beam | 8 ft 6 in post spacing |
| 2-2x12 | 3 in | 11.25 in | Large beam | 10 ft post spacing |
Posts
Tip: the calculator now defaults primary deck supports to 6x6 ground-contact posts with matching post bases and beam caps.
| Nominal Size | Actual Size | Conservative Height Band | Common Use |
|---|---|---|---|
| 4x4 | 3.5" x 3.5" | Up to 10 ft | Low decks under 6 ft high |
| 6x6 | 5.5" x 5.5" | Up to 18 ft | Mainstream recommendation for tall decks |
Guard and Handrail Components
| Component | Nominal Size | Actual Size | Common Use | Planning Rule |
|---|---|---|---|---|
| Guard kit | 36 in x 6 ft section | - | Most deck perimeter guard runs | Guard auto-required at or above 30 in walking-surface height |
| Handrail | 8 ft stair handrail kit | - | Open stair side | Used when stair run reaches 4 risers or more |
| Balusters | 2x2 equivalent | 1.5" x 1.5" | Guard infill | Keep openings below a 4 in sphere |
Stair Components
| Component | Nominal Size | Actual Size | Common Use | Planning Rule |
|---|---|---|---|---|
| Stringers | 2x12 | 1.5" x 11.25" | Primary stair support | Composite and PVC treads tighten planning support to 12 in o.c. |
| Treads | 5/4x6, 2x6, or 1x6 | Profile-dependent | Walking surface | Tread quantity follows stair width and selected decking profile |
| Risers | 1x8 | 0.75" x 7.25" | Closed riser board | Rise is capped at 7-3/4 in per riser |
Foundation and Hardware Quick Reference
- Concrete bags: All footing concrete counts are expressed as 80 lb concrete bags.
- Footing embed depth: The estimator uses the greater of user depth or the state-level frost-depth floor.
- Post base: Post bases are matched to the selected post size and the calculator defaults primary supports to 6x6 posts.
- Beam connectors: Each support post receives a matched beam-to-post connector cap in the planning BOM.
- Joist hangers: Attached decks use joist hangers sized to the selected joist member plus a dedicated hanger-fastener allowance.
- Guard hold-downs: Guarded decks include a conservative guard-post hold-down allowance for edge restraint.
- Ledger package: Attached decks receive a ledger board, flashing, structural fasteners, and lateral-load connectors.
- Composite fastening: Composite and PVC decking default to hidden clips on field boards plus fascia fasteners for perimeter trim.
All dimensions follow U.S. nominal vs actual standards. This calculator uses conservative IRC-style rules for rectangular residential decks and does not replace local code review or engineered design.
How to calculate deck materials
A deck material list comes from five takeoffs done in order: decking, framing, footings, railing, and stairs. This calculator runs all five from your deck length, width, and height, then prices each line.
- Decking boards. Divide the deck width by the board face width plus the gap to get the number of rows, match each row to a stock length, then add waste. A diagonal layout needs more boards than a straight one.
- Joists and beams. Joists are counted from the deck length and the joist spacing, plus the end joists. The calculator may tighten the spacing you pick: some board materials and diagonal layouts need joists closer together. Joist and beam sizes follow the span they have to cover.
- Posts, footings, and concrete. Each beam line gets posts, and every post gets a footing. Concrete bags come from the footing diameter and depth; check that depth against your local frost line.
- Railing, stairs, and hardware. Guard length is the guarded edges minus the stair opening. Deck height sets the number of stair steps; stair width sets the number of stringers. Joist hangers, post bases, and connectors are counted from the framing.
Example: 16 × 12 ft deck material list
A 16 ft by 12 ft attached deck, 3 ft above ground, covers 192 sq ft. With pressure-treated 5/4x6 boards and joists at 16 in on center, the default plan lists 29 deck boards, 13 joists, 3 posts on 3 footings, 22 bags of concrete, and 36 linear feet of guardrail after the 4 ft stair opening. Other inputs stay at their defaults.
Deck material questions
How many deck boards do I need?
Count the rows across the deck: deck width divided by board face width plus gap. Then buy enough stock lengths to cover every row and add waste for cuts. The calculator shows the board count and the waste it added.
Does the material list include joists, footings, and hardware?
Yes. The list covers decking, joists, beams, posts, footing concrete, guardrail, stairs, hangers, and fasteners. Permits, inspections, and engineered design are outside the material list.
Can I use this list for a permit?
No. It is a planning estimate based on conservative span rules for rectangular residential decks. Confirm spans, footing depth, and ledger attachment with your local building department or a licensed professional before you build.
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29 5/4x6 deck boards for 192 sq ft
Estimated materials total