How much decking per square foot?

About 2.3 lineal feet of 5½ in board per sq ft, plus waste.

What waste percentage should I use?

10% for straight patterns; 15% for diagonal or picture-frame layouts.

2 screws per joist connection — about 350 screws per 100 sq ft.

Exterior

Estimate decking boards by area and board size. Fast planning tool for backyard decks.

Areasq ft

Box coveragesq ft

Price per box$

Live estimate

Boxes needed

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Area with waste = area × (1 + waste %).

Boxes = ceil(area with waste ÷ box coverage).

Standard board coverage varies by width and length — check your supplier's actual sq ft per bundle.
Add 10–15% waste for miters, cuts, and pattern layouts.
Joist spacing: 16 in on-center standard; 12 in for diagonal or 45° layouts.

Local suppliers

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Structural deck framing (posts, beams, joists) requires engineering and a permit in most jurisdictions.