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Deck Material Calculator
Estimate decking square footage and cost.
Enter your deck length and width to see how much decking you need.
How this calculation works
This deck material calculator estimates the decking you need for the surface of your deck. We multiply length by width for the area and add 10% for waste from cuts, trimming, and board layout.
We also estimate the number of standard 8-ft deck boards (each covers about 2.75 usable square feet). The cost estimate uses about $8 per square foot for decking material only — framing, joists, posts, and fasteners are extra.
For diagonal or picture-frame patterns, add 15% waste instead. This estimate covers the deck boards, not the substructure beneath them.
Recommended tools & supplies
Handy products for this project. (Affiliate links — we may earn a commission.)