Deck Material Calculator
Building a deck and not sure how much lumber to buy? Enter your deck dimensions and we'll calculate your complete material list so you can walk into the lumber yard knowing exactly what you need.
How to use this calculator
- Composite decking costs more upfront but eliminates yearly staining and sealing.
- Joists should be spaced 16 inches on center for most residential decks.
- Use stainless or coated screws — galvanized fasteners corrode quickly in pressure-treated lumber.
- Always check local code for railing height; 36 inches is typical, 42 inches for elevated decks.
Common mistakes to avoid
- →Forgetting waste and overage. Most pros add 10–15% extra to cover offcuts, mistakes, and damaged material.
- →Measuring once. Always double-check critical dimensions before ordering — returns waste time and money.
- →Ignoring permits and codes. Check with your local building department before purchasing materials for any structural project.
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