Deck Calculator

16 in on center is standard; composite decking often requires 12 in.
Worked example result
Boards needed26
Length of each board16 ft
Total decking416 linear ft
Joist crossings per board13
Screws (2 per crossing)676

A 16 × 12 ft deck with 5.5 in boards and a 1/8 in gap needs 26 boards (416 linear feet). Each board crosses 13 joists, so at 2 screws per crossing you need about 676 screws.

Boards = ceil(Deck width (in) ÷ (board width + gap)); Screws = Boards × (floor(Length (in) ÷ joist spacing) + 1) × 2 · Powered by CalcHub — Deck Calculator