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Deck Board Calculator

Enter your deck's dimensions, board width, gap spacing, and standard board length to calculate boards needed.

35 boards

35 rows · 420 linear ft total · ≈ $980.00

Assumes boards run across the deck width, laid end to end along the length with a consistent gap. Add 10-15% extra for cuts, waste, and picture-frame borders.

How to use this tool

  1. 1Enter your deck's length and width in feet.
  2. 2Enter the board width and gap between boards in inches.
  3. 3Enter the standard board length sold at your supplier.
  4. 4See total boards needed and estimated cost.

Frequently asked questions

Does this account for a picture-frame border or diagonal pattern?+

No — this assumes boards run straight across the deck width; add 10-15% extra material for borders, diagonal layouts, or complex cuts.

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