Enter deck width and projection, pick joist spacing and board type joists, planks, posts, and concrete update live.
5.5″ face + ¼″ gap per board · 10% cut waste included.
Decking planks to order
29
PLANKS
Bill of materials+10% waste
Field joists 16″ O.C.
16-ft stock · +1 starter joist
Net 16 ft span · Waste —
Rim & ledger boards
16-ft stock lengths
Net 56 lin ft · Waste —
Decking 5/4×6 composite / PVC
464 lin ft · ¼″ gap
Net 192 sq ft · Waste +10%
Support posts 36″ holes
4×4 or 6×6, per local code
Net 8′ O.C. · Waste —
Post concrete 80-lb bags
4 bags per post (36″ holes)
Net 6 footings · Waste —
Hidden fastener packs
100 sq ft coverage per pack
Net 192 sq ft · Waste —
Cost projection
Saved on this device · No account · No cloud
Total · $2,174.80
29 planks
Field joists = ceiling(width in inches ÷ spacing) + 1 starter joist. Use 12 in O.C. for composite or diagonal decking, 16 in O.C. for standard wood.
Enter deck width and projection, pick joist spacing and board type joists, planks, posts, and concrete update live.
Rim and ledger boards = 2 × width + 2 × projection, converted to 16-ft stock lengths.
Decking planks run across the projection: ceiling(projection in inches ÷ 5.75) × 1.10 the 5.5 in face plus ¼ in gap, with 10% cut waste.
Posts = (ceiling(width ÷ post spacing) + 1) × ceiling(projection ÷ post spacing), with 2 eighty-pound concrete bags per footing.
Joists = ceil(W×12 ÷ spacing) + 1
Boards run across the projection: ceiling(projection in inches ÷ 5.75) × 1.10. A 16x12 ft deck needs ceil(144 ÷ 5.75) = 26 courses × 1.10 waste = 29 planks, each 16 ft long.
Field joists = ceiling(width in inches ÷ spacing) + 1 starter joist. Rim and ledger = 2 × width + 2 × projection in 16-ft stock. Posts = (ceiling(width ÷ post spacing) + 1) × ceiling(projection ÷ post spacing).
Ceil(192 ÷ 16) + 1 = 13 field joists, plus 4 rim and ledger boards in 16-ft stock (2×16 + 2×12 = 56 lin ft ÷ 16).
Two 80-lb bags per post is the standard for a 36-in-deep footing. A 6-post deck needs 12 bags.
Enter your local board, lumber, and concrete prices and the calculator totals the material cost from the full bill of materials — joists, planks, posts, concrete, and fasteners with waste included.
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