Decks and stairs
Geometry and shopping counts for stairs and decks, compared with named code figures. These tools don't size structure or confirm that a deck is safe.
Guides and calculators
Decks and stairs
Stair Calculator: Risers, Treads and Total Run
Enter your total rise and tread depth to get risers, treads, run and angle, compared with named 2021 IRC figures, with the renumbered 2024 sections noted.
Decks and stairsBaluster Spacing Calculator and Deck Guard Rules
Work out how many balusters a rail section needs and the equal gap between them, with the IRC's guard height, opening and 30-inch trigger explained.
Decks and stairsDeck Materials Calculator: Boards, Joists and Fasteners
A shopping count for a simple rectangular deck: boards, joists and fasteners from your size and spacing. It doesn't size structure, and says when to get help.