Outdoor Tools

DeckCalculator

Calculate decking boards, joists, posts, and concrete for wood or composite decks. Includes railings, stairs, and fasteners.

Deck Specifications

Materials

Decking Boards0boards
Joists0joists
Posts (4×4 or 6×6)0
Concrete Bags0
Railing Sections0
Stair Stringers0
Fasteners/Screws0 lbs
Total Cost$0

Deck Coverage

  • 5-1/2" board: Covers 5.5" per board
  • Add 1/4": For gap spacing
  • Joists: Span depends on species/size

Formula

Boards = (Length × 12) ÷ (Width + Gap)

Joists = (Width × 12 ÷ Spacing) + 1

Posts = Every 6-8 feet

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