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Deck

Deck board planning

Board quantity depends on the layout, actual face width, and required gaps. Dividing deck area by nominal board width misses those details. The USDA Wood Handbook covers material, moisture, fasteners, durability, and construction; structural dimensions still come from the local plan and code.

Quick answer

Start with the deck dimensions from your plan, then use the actual board face width and required gap to lay out rows. Measure finish area only for the faces the chosen coating requires.

Run the deck board calculator

How to work it out

row count = ceiling((deck width + specified gap) ÷ (actual board face width + specified gap)); total run = sum of row lengths
  • Use actual dimensions, not the nominal lumber name.
  • The gap comes from the approved system or installation instructions and is counted only between boards.
  • Handle borders, picture frames, stairs, and angled layouts as separate runs.

Deck takeoff inputs

Deck takeoff inputs
InputWhere it comes fromOutput affected
Deck geometryapproved plan/site verificationrow lengths
Actual board widthselected productrow count
Gapinstallation detailrow count
Layout featuresdrawn planseparate runs/cuts

Plan the job

  1. Start with the approved plan

    Confirm framing, loads, footings, guards, stairs, ledger, fasteners, and permits before a finish-board takeoff.

  2. Draw every board run

    Show field rows, borders, stairs, breaks, and direction changes so the formula is tied to a buildable layout.

  3. Check wood and hardware compatibility

    Match species, treatment, exposure, fasteners, and connector requirements using product and code information.

Before you start

  • This worksheet does not design a deck or establish allowable spans.
  • Existing deck deterioration or unsafe connections require qualified assessment before resurfacing.

Sources and notes

Source links reviewed July 16, 2026. A review date is not the document's publication date.

  1. USDA Forest Products Laboratory: Wood Handbook: Wood as an Engineering MaterialUnited States · government guide

    Structural deck design remains subject to local code and site-specific engineering requirements.

  2. National Institute of Standards and Technology: NIST Guide to the SI, Appendix B — Conversion FactorsUnited States · government standard

    Code retains exact defining constants where NIST identifies an exact relationship.