Deck Board Calculator
Estimate the decking surface before you shop. Enter deck dimensions, actual board width and board gap to calculate rows, linear footage and an approximate fastener count.
Enter your project measurements to see the estimate.
Check the method or common questions
Method, formula & assumptions
Deck material planning
Formula: Decking rows are based on the deck width divided by the installed board width plus gap. Joist quantities use the selected on-center spacing, and surface fasteners are estimated from board-to-joist intersections.
Worked example: Example: changing joist spacing from 16 in to 12 in on center increases both joist quantity and the number of decking fastener intersections.
Before you buy: These are material takeoff tools, not structural design tools. Beam spans, joist spans, footing sizes, ledger connections and hardware must follow the applicable design and code requirements for your project.
Deck Board Calculator FAQ
Does the deck calculator size beams or joists?
No. It estimates material quantities from dimensions you provide; structural member sizing requires project-specific design information.
Why add waste to decking?
Board defects, trimming and layout cuts can consume additional linear footage beyond the finished deck dimensions.
Continue your Deck project
Use the Deck planning hub for related calculators and quick-reference guides.
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