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Deck Calculator

This is a materials takeoff for surface boards and joists, useful for budgeting and comparing quotes. It does not design the structure.

Your result appears here after you press Calculate.

How it is calculated

  • Board coverage width = board width + gap.
  • Board rows = deck width in inches ÷ coverage width, rounded up. Total board length = rows × deck length × (1 + waste).
  • Boards = total length ÷ board length, rounded up.
  • Joists = deck length in inches ÷ spacing + 1.

Assumptions and limits

  • Boards run along the deck length and joists run across the width. Real layouts vary.
  • Joist size, span, footings, ledger attachment and railings are structural questions governed by local code. Use a qualified designer or contractor.

Material estimates are for planning and ordering guidance. Coverage, yield and dimensions vary by product, so check the manufacturer's labeling. Structural work, roofing at height and code compliance should be handled by qualified professionals and confirmed with your local building department.

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