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Deck Calculator

Estimate deck boards, joists, posts, concrete footings, and total material cost. Supports pressure-treated lumber, cedar, and composite decking.

'How long do deck boards last?', 'answer' => 'Pressure-treated lumber typically lasts 15–25 years. Cedar lasts 15–20 years with proper maintenance. Quality composite decking can last 25–30+ years with minimal maintenance and often comes with a manufacturer warranty.'], ['question' => 'How many 80-lb bags of concrete per deck post?', 'answer' => 'Typically 2–3 bags per post depending on hole depth and diameter. This calculator uses 2 bags as a baseline. For frost depths below 3 feet, budget 3–4 bags per post.'], ['question' => 'What board width should I specify?', 'answer' => '5.5" is the actual (dressed) width of a standard 2×6 deck board (nominal 6"). 5/4×6 decking has an actual width of 5.5" as well. Always use actual dimensions, not nominal, for accurate calculations.'], ]" />

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