Deck Calculators: Boards, Concrete, Stairs & Balusters

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Deck board calculator
Baluster spacing calculator
Concrete calculator for footings
Stair stringer calculator

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Before you build

The 4-inch railing rule, explained
Stair code limits to check
Concrete bag yield table

DeckCalc provides free estimating calculators for planning purposes only. Deck construction is regulated by local building codes — always confirm footing depth, railing spacing, and stair dimensions with your local building department and obtain any required permits before building. © 2026 DeckCalc.