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Decking Boards Calculator

Number of boards needed for a wooden deck.

Compute the number of decking boards needed to cover a rectangular deck from board dimensions and a small wastage allowance.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

m
m
m
m

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Boards ≈ ⌈deck width / board width⌉ × ⌈deck length / board length⌉, with a 10% allowance for cuts.

In depth

Compute the number of decking boards needed to cover a rectangular deck from board dimensions and a small wastage allowance.