How much lumber for a 12×16 ft deck?
Answer
58 boards, 13 joists, 8 posts
Deck area: 192 sq ftDecking boards (5.5" wide, 12' long): 58 boardsJoists (16" on center): 13Posts: 8 (2 beams)Screws: 744Linear feet of decking: 458 ftIncludes 10% waste factor
Need a custom calculation?
Open the full calculator with custom inputs
How We Calculated This
Boards = ceil(rows × boardsPerRow × 1.10), Joists = ceil(width×12 / spacing) + 1
Area = 12 × 16 = 192 sq ft. Boards = 58 (with 10% waste). Joists = ceil(16×12 / 16) + 1 = 13. Posts = 8.
Related Calculations
How much lumber for a 8×10 ft deck?20 boards, 9 joists, 6 postsHow much lumber for a 8×12 ft deck?20 boards, 10 joists, 6 postsHow much lumber for a 10×10 ft deck?25 boards, 9 joists, 6 postsHow much lumber for a 10×12 ft deck?25 boards, 10 joists, 6 postsHow much lumber for a 10×14 ft deck?49 boards, 12 joists, 8 posts
Calculated using verified formulas. Last updated March 2026.