How many deck boards do I need?

Enter your deck size, choose a board width and angle. The calculator converts area to total linear feet and shows counts for 8′–20′ lengths with a default 5% cut-waste.

What are common deck board sizes?

Common faces are ≈3.5″ (2×4 or 5/4×4) and ≈5.5″ (2×6 or 5/4×6). A 1/8″ gap is assumed for coverage.

How do I measure my deck?

Measure length and width to the nearest inch and multiply to get ft². For L-shapes, split into rectangles and add the areas. You can also type total square feet directly.

How does a 45° decking angle affect materials?

Diagonal decking increases total linear footage. We multiply by an angle factor of about 1.414 (√2) compared to 90° runs.

How much waste should I plan for?

We add a standard 5% cut-waste to required boards, then round up to whole boards per chosen length.

How many screws or hidden fasteners will I need?

We estimate fasteners using boards-across × joists-along. Screws = intersections × 2; hidden clips = intersections × 1.

Can I enter total square feet instead of dimensions?

Yes. If you provide ft² we use that directly. For fastener counts without dimensions, we approximate a square deck with side √area.

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