Deck Joist Spacing Calculator
16" o.c. typical; 12" for 5/4 decking. Joists = (deck width / spacing) + 1.
About this tool
Deck Joist Spacing Calculator is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
Category: Trade & Construction Calculators. Browse more Trade & Construction Calculators tools.