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How much lumber for a 10×14 ft deck?

Answer
49 boards, 12 joists, 8 posts
Deck area: 140 sq ftDecking boards (5.5" wide, 12' long): 49 boardsJoists (16" on center): 12Posts: 8 (2 beams)Screws: 581Linear feet of decking: 339 ftIncludes 10% waste factor

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How We Calculated This

Boards = ceil(rows × boardsPerRow × 1.10), Joists = ceil(width×12 / spacing) + 1

Area = 10 × 14 = 140 sq ft. Boards = 49 (with 10% waste). Joists = ceil(14×12 / 16) + 1 = 12. Posts = 8.

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Calculated using verified formulas. Last updated March 2026.