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Deck Stock Board and Course Count Calculator

Count decking courses and whole stock boards using actual face width, side gap, stock length and a chosen quantity allowance.

Use this result well

Inputs that matter
Deck width across boards (ft), Deck run along boards (ft), Actual board face width (in), Specified side gap (in), and 3 more
Output to expect
Deck board stock count
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Deck board stock count

Count stock boards for parallel rectangular decking courses on an already approved layout. The tool assumes each course uses its own stock pieces and does not reuse offcuts. Enter actual board face width, manufacturer-specified side gap, stock length and your selected allowance. It does not size joists, beams, fasteners or connections.

Courses = ceil((deck width in inches + gap) ÷ (board width + gap)); stock pieces per course = ceil(run length ÷ stock length); purchase count = ceil(base count × (1 + selected allowance)).

Updated: September 2026

Example Scenarios

The built-in example uses fictional planning records. Replace these with your own verified details.

→ 24 stock boards

FAQ

No. Use approved dimensions, support and product instructions. The layout counts whole boards per course without reusing offcuts. Purchased linear feet use stock length; cut and joint planning remain separate.

Use your own records on the units and period shown. Verify current requirements, enter explicit zeros for absent amounts where requested and retain dated sources.

Choose Save planning case for local history. Copy MD includes current inputs, notes and interpretation; Download CSV exports the result breakdown. Keep a portable copy separately.

About Deck Stock Board and Course Count Calculator

Count stock boards for parallel rectangular decking courses on an already approved layout. The tool assumes each course uses its own stock pieces and does not reuse offcuts. Enter actual board face width, manufacturer-specified side gap, stock length and your selected allowance. It does not size joists, beams, fasteners or connections.