Deck Board Material Calculator
Calculate total linear feet, number of standard boards (8', 12', 16', 20'), joists, fasteners, and waste allowances for any wood or composite deck.
240 sq ft
(22.3 sq meters) · 26 rows of boards
Frequently Asked Questions (Deck Board FAQ)
How many deck boards do I need for my deck size?
To calculate deck boards, divide the deck dimension by the effective board width (nominal width + gap) to find the number of rows. Then multiply rows by the run length to find total linear feet, add 10% for cutting waste, and divide by stock board length (e.g. 16 feet).
What is the standard gap between deck boards?
A 3/16" (0.188") gap is the industry standard for composite and kiln-dried wood decking to allow water drainage and expansion. For wet pressure-treated lumber, a 1/8" gap is typical as boards will naturally shrink after drying.
How many screws are needed per deck board?
Standard construction requires 2 screws at every joist intersection. For 16" on-center joists, plan for approximately 350 screws per 100 square feet of deck surface.
What joist spacing is required for composite decking?
Most composite decking manufacturers (like Trex, TimberTech) require 16" on-center joist spacing for straight boards, but require 12" on-center spacing when laying boards on a 45-degree diagonal pattern to prevent sagging.