Deck Calculator

Free tool — embed on your site for free.

You need
  • Deck boards
    30 boards
    16 ft each, 192.00 sq ft deck area + 10% waste
  • Joists (2x8)
    13 joists, ~13 × 12 ft boards
    16" OC, 12.00 ft span
  • Deck screws
    2 × 5 lb boxes
    ~780 screws total
  • Joist hangers
    13 hangers
    one per joist end at the ledger/beam
  • Estimated material cost
    $695
    boards + joists + fasteners + hangers. Excludes posts, concrete, railing, stairs, labor.

This covers the deck surface only. You still need posts, footings (concrete), a ledger board, flashing, stairs, and railing — plus permits in most jurisdictions.