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Deck Board Calculator — Boards, Fasteners, Linear Feet & Cost

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Deck length — boards run this way (ft) Deck width — across board rows (ft) Actual board face width (in) Use actual face width, not only the nominal lumber name.Gap between boards (in) Stock board length (ft) Joist spacing on center (in) Used only for the fastener planning count; enter the actual framing spacing.Fasteners per board-to-joist intersection Use the fastening pattern required by the board/system manufacturer.Waste / cuts allowance (%) Price per stock board (optional)

Calculated result

29 stock boards

26 board rows across 12 ft

1 stock board per row before waste/cut allowance

416 exact linear ft · 457.6 linear ft after allowance

13 approximate joist lines along each board run · 338 board-to-joist intersections

676 fasteners at 2 per intersection

192 sq ft deck area

Add a board price only when you want a simple material subtotal.

Show the working

1. Row coverage = (5.5 + 0.25) in = 0.47917 ft.
2. Rows = ceil(12 ÷ 0.47917) = 26.
3. Boards per row = ceil(16 ÷ 16) = 1.
4. Stock boards = ceil(26 × 1 × 1.1) = 29.
5. Joist lines ≈ ceil(192 in ÷ 16 in) + 1 = 13; fasteners = 26 × 13 × 2 = 676.

Straight-row planning model only. Picture frames, diagonal layouts, breaker boards, seams and real offcut reuse can change the cut list. Fastener count is an intersection estimate; blocking, doubled framing, board ends and the actual fastening system can change the real quantity.

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