Whole-project calculator

Deck Material Calculator

Plan decking, framing, footings, guardrails, stairs, and hardware for a residential deck with region-aware material pricing.

Quick presets

Inputs

This default starts at 36 in, so the calculator keeps exposed sides guarded. Drop the height below 30 in for a ground-hugging deck where guards become optional.

Attached decks connect to the house through a ledger. Have the flashing, fastener pattern, and band-joist condition verified on site — this connection is the most common failure point in deck collapses.

1 Geometry and layout 3 groups

Set the footprint and primary layout path before fine-tuning quantities and finishes.

Deck geometry

Deck Length (ft) Type it the way you measured it - 16' 6" or 16.5 both work. Deck Width (ft) Deck Height Above Ground (ft) Starts at a 36 in typical backyard height, which requires guards and stairs in the calculator. For a ground-hugging deck, set 2 ft or lower and clear the guard checkboxes. Deck Type Ledger Condition Use a review-needed option when existing finishes or field retrofit details affect the house connection.

Decking

Board Size 5/4 (say "five-quarter") is the standard deck-board thickness - about 1 in actual. 2x6 is a full two-by board, heavier and stiffer. Board Material Board Gap (in) Board Stock Length (ft)

Regional settings

State / Pricing Region ZIP Code

2 Structure and support 3 groups

Open this stage after choosing a preset or locking the geometry baseline.

Footings

Footing Diameter (in) Footing Depth (in)

Framing

Joist Spacing (in) Spacing is listed in inches on center (o.c.) — measured center to center from one joist to the next. Beam & Post Layout

Include joist tape Adds a joist-top flashing tape allowance when wet exposure or composite decking justifies extra protection.

Guardrails

Front guardrail

Left guardrail

Right guardrail

3 Openings and access 1 group

Add doors, windows, gates, and stairs only after the main structure is stable.

Stairs

Include stair package

Stair Clear Width (ft) Stair Side Stair Offset Along Selected Edge (ft) Distance from the corner to the stair opening. 0 puts it at the corner. How far it can go depends on the length of the edge you picked - if you overshoot, the calculator pulls it back and says so.

Include stair landing pad Adds a basic concrete landing pad allowance at the bottom of the stair run.

4 Finish and pricing 1 group

Refine finish and region only after the rest of the plan is clear.

Advanced assumptions

Engineers' defaults - most homeowners keep these.

Soil Load Capacity (psf) Custom Frost Depth (in) Decking Pattern Deck Fastener Style Framing Species / Grade Environment

Planning rules & code notes U.S. planning assumptions, pricing coverage, and permit-sensitive notes for this calculator.

This calculator uses common IRC-style residential assumptions for spacing, waste, and coverage. Confirm site conditions, spans, and local code before ordering.
Regional pricing and frost guidance currently cover selected states. If your saved state falls outside coverage, the calculator keeps it visible and falls back to calculator default pricing instead of silently switching regions.

Reset inputs

Use this button to recalculate without JavaScript or create a complete, shareable page URL.

2D plan

Schematic assembly 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.

Deck area 192 sq ft

Decking spec Pressure-treated 5/4x6

Deck boards 29

Fascia boards 3

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.

Plan details & review

More project facts 25

Joists 13 pcs of 2x8 @ 16 in o.c.

Beam assembly 2-2x10 x 1

Support layout Calculator default

Posts 3 6x6 posts

Support posts/beam 3

Footings 3

Concrete bags 22

Fastener system Face screws

Joist hangers 13

Beam connectors 3

Post bases 3

Guard length 36 lf

Guard sections 6

Guard hold-downs 9

Stair stringers 3

Stair treads 4

Stair risers 5

Stair opening 4 ft

Pricing region Calculator default pricing

Clear joist span 9 ft 7 in

Footing depth 36 in

Frost-depth floor 36 in

Frost basis Calculator default @ 36 in

Stringer spacing rule 16 in o.c. max

Handrail Included in plan

Planning assumptions

Material quantities and planning BOM for Deck Material Calculator based on selected inputs.

Planning assumptions · 7

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 come from a BuildListCalc reference price adjusted by a state-level cost index. A store listing tied to your own region is used only on the few lines where one exists.
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.

Not included / Trade review

Ledger / stairs / guards

How pricing works

Where each price comes from, when it was checked, and what the formulas assume.

Need local install pricing?

Compare quotes from contractors near you — or just save this plan, share it, and export a PDF for your records.

Compare contractor quotes

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	Source
Pressure-treated 5/4x6 deck boards 5/4x6 \| Stock 16 ft \| Pressure TreatedActual 1 in thick x 5.5 in wide	decking	board	29	$14.88	$431.52	Lowe's Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Lowe's
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 29 Quantity type: Purchase quantity Purchase quantity: 29 Coverage: Deck rows x deck length with profile-specific coverage and waste Waste factor: 8%
Pressure-treated fascia boards 5/4x6 \| Stock 16 ft \| Pressure TreatedActual 1 in thick x 5.5 in wide	decking	board	3	$14.88	$44.64	Lowe's Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Lowe's
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 3 Quantity type: Purchase quantity Purchase quantity: 3 Coverage: Exposed deck perimeter with trim waste Waste factor: 5%
Exterior deck screws Pressure Treated	deck fastening	box	3	$29.97	$89.91	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Home Depot
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 3 Quantity type: Purchase quantity Purchase quantity: 3 Coverage: Coverage by deck area and decking family Waste factor: 5%
2x8 deck joists 2x8 \| Stock 12 ftActual 1.5 in thick x 7.25 in wide	deck framing	board	13	$19.68	$255.84	Lowe's Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Lowe's
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 13 Quantity type: Purchase quantity Purchase quantity: 13 Coverage: Joist lines sized from conservative joist-span lookup Waste factor: 8%
2x8 rim boards 2x8 \| Stock 12 ftActual 1.5 in thick x 7.25 in wide	deck framing	board	6	$19.68	$118.08	Lowe's Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Lowe's
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 6 Quantity type: Purchase quantity Purchase quantity: 6 Coverage: Perimeter rim layout with framing waste Waste factor: 8%
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	$35.88	$71.76	Lowe's Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Lowe's
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 2 Quantity type: Purchase quantity Purchase quantity: 2 Coverage: Built-up beam plies x beam lines x splice count Waste factor: 8%
6x6 support posts 6x6 \| Stock 8 ft \| Pressure Treated	deck framing	post	3	$34.68	$104.04	Lowe's Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Lowe's
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 3 Quantity type: Purchase quantity Purchase quantity: 3 Coverage: Beam support layout without post waste padding Waste factor: 0%
2x8 blocking pieces 2x8 \| Stock 2 ftActual 1.5 in thick x 7.25 in wide	deck framing	piece	12	$19.68	$236.16	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Home Depot
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 12 Quantity type: Purchase quantity Purchase quantity: 12 Coverage: One mid-span blocking row between joists Waste factor: 0%
2x8 ledger boards 2x8 \| Stock 16 ft \| Pressure Treated	ledger	board	1	$25.08	$25.08	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 06/01/2026 — price may have changed - verify before orderingRetailer: Home Depot
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 1 Quantity type: Purchase quantity Purchase quantity: 1 Coverage: Attached deck ledger board matching joist depth Waste factor: 8%
Ledger flashing 10 ft flashing \| Stock 10 ft	ledger	piece	2	$17.49	$34.98	McCoy's Building Supply Shopping-ready Price source: Retailer pricePrice as of: 08/09/2026Retailer: McCoy's Building Supply
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 2 Quantity type: Purchase quantity Purchase quantity: 2 Coverage: Ledger line with 10 ft flashing pieces Waste factor: 0%
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 Shopping-ready Price source: Retailer pricePrice as of: 06/05/2026 — price may have changed - verify before orderingRetailer: Home Depot
Quantity basis The visible row quantity is an installed or coverage basis, not a package count. Convert it to supplier pack sizes. Qty: 14 Quantity type: Installed / coverage quantity Installed / coverage quantity: 14 Purchase quantity: 2 Waste quantity: 0 Coverage: Approx. one structural fastener every 16 in plus end fasteners Waste factor: 0%
Lateral-load connectors lateral load connector pair	ledger	pair	2	$35.00	$70.00	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Home Depot
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 2 Quantity type: Purchase quantity Purchase quantity: 2 Coverage: Conservative attached-deck tie requirement Waste factor: 0%
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	$6.47	$142.34	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 06/05/2026 — price may have changed - verify before orderingRetailer: Home Depot
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 22 Quantity type: Purchase quantity Purchase quantity: 22 Coverage: Circular footing volume x 45 bags/cu yd with concrete waste Waste factor: 5%
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	$59.26	$355.56	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Home Depot
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 6 Quantity type: Purchase quantity Purchase quantity: 6 Coverage: Guarded perimeter minus stair opening, converted to 6 ft sections Waste factor: 5%
Guard post hold-down connectors guard post hold-down tie	guard	tie	9	$13.82	$124.38	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 07/06/2026 — price may have changed - verify before orderingRetailer: Home Depot
Quantity basis The visible row quantity is an installed or coverage basis, not a package count. Convert it to supplier pack sizes. Qty: 9 Quantity type: Installed / coverage quantity Installed / coverage quantity: 9 Coverage: Conservative edge-guard restraint allowance based on guard sections and stair openings Waste factor: 0%
2x12 stair stringers 2x12 \| Stock 12 ft \| Pressure Treated	stairs	stringer	3	$36.38	$109.14	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Home Depot
Quantity basis The visible row quantity is an installed or coverage basis, not a package count. Convert it to supplier pack sizes. Qty: 3 Quantity type: Installed / coverage quantity Installed / coverage quantity: 3 Coverage: At least three stringers, widened by stair width and tread-family support spacing Waste factor: 0%
Pressure-treated stair tread boards 5/4x6 \| Stock 8 ft \| Pressure TreatedActual 1 in thick x 5.5 in wide	stairs	board	5	$7.18	$35.90	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 07/06/2026 — price may have changed - verify before orderingRetailer: Home Depot
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 5 Quantity type: Purchase quantity Purchase quantity: 5 Coverage: Tread count x stair width x boards per tread Waste factor: 8%
1x8 stair riser boards 1x8 \| Stock 8 ft \| Pressure Treated	stairs	board	3	$8.48	$25.44	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 07/06/2026 — price may have changed - verify before orderingRetailer: Home Depot
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 3 Quantity type: Purchase quantity Purchase quantity: 3 Coverage: Closed riser assumption based on tread count Waste factor: 5%
Stair handrail kits 8 ft stair handrail kit \| 8 ft section	stairs	section	1	$196.80	$196.80	Arbor Home Shopping-ready Price source: Retailer pricePrice as of: 08/09/2026Retailer: Arbor Home
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 1 Quantity type: Purchase quantity Purchase quantity: 1 Coverage: One stair handrail run when stair rise reaches four risers or more Waste factor: 0%
6x6 post bases Fits 6x6 posts	deck hardware	base	3	$25.27	$75.81	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Home Depot
Quantity basis The visible row quantity is an installed or coverage basis, not a package count. Convert it to supplier pack sizes. Qty: 3 Quantity type: Installed / coverage quantity Installed / coverage quantity: 3 Coverage: One post base per support post Waste factor: 0%
6x6 beam-to-post connectors 6x6 beam cap \| Fits 6x6 posts	deck hardware	connector	3	$17.20	$51.60	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 06/05/2026 — price may have changed - verify before orderingRetailer: Home Depot
Quantity basis The visible row quantity is an installed or coverage basis, not a package count. Convert it to supplier pack sizes. Qty: 3 Quantity type: Installed / coverage quantity Installed / coverage quantity: 3 Coverage: One beam connector per support post Waste factor: 0%
2x8 joist hangers Fits 2x8 joists	deck hardware	hanger	13	$2.57	$33.41	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 07/20/2026Retailer: Home Depot
Quantity basis The visible row quantity is an installed or coverage basis, not a package count. Convert it to supplier pack sizes. Qty: 13 Quantity type: Installed / coverage quantity Installed / coverage quantity: 13 Coverage: Attached deck ledger connection model Waste factor: 0%
Joist hanger fastener boxes connector fastener box	deck hardware	pack	1 covers 130 fastener	$23.73Not editable: priced as a package	$23.73	Home Depot Shopping-ready Price source: Retailer pricePrice as of: 06/05/2026 — price may have changed - verify before orderingRetailer: Home Depot
Quantity basis The visible row quantity is a purchase or ordering quantity. Qty: 1 Quantity type: Purchase quantity Installed / coverage quantity: 130 Purchase quantity: 1 Waste quantity: 0 Coverage: Connector-fastener allowance sized from attached-deck hanger count Waste factor: 0%

Some links in this calculator are affiliate links. BuildListCalc may earn a commission at no extra cost to you.

Estimated materials total$2,709.96

23 priced lines / 23 total lines

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.