Deck planning comes down to a few counts: how many boards cover the surface, how much lumber you need, and how much concrete the post footings take. These free calculators handle each one.
Deck planning tools.
How to plan a deck
Start with the deck area in square feet, then use the deck board calculator to turn it into a board count for your board width and length. Footings are set with concrete, so check the post hole math in the concrete bags per post guide.
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The board foot calculator prices lumber by volume, and the foundation footing calculator covers larger footings. Confirm footing depth and size with your local building department.
Estimates only. This is general guidance, not professional advice. Confirm details with your supplier, installer or local building department.