Deck Material Calculator
Enter deck length and width, board width (for example 5.5 in for a 6 in nominal), board length, and gap. Waste defaults to 10%. Optional joist spacing estimates joist count.
Math runs in your browser. Nothing is uploaded.
Boards needed
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Boards with waste
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Area
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Joist count
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Boards use effective width (board + gap) and round up. Waste rounds up again. Joists ≈ floor(length / spacing) + 1.
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How it works
- Is any data uploaded?
- No. These calculators and QR codes run in your browser.
- Are files uploaded?
- No. Conversion and math run in your browser.