Deck Board Calculator

Quick estimate for your project. Free — no account.

Formula

Boards = ceil(deck width ÷ (board width + gap)).

Worked example

{
  "length": 16,
  "width": 12,
  "boardWidthIn": 5.5,
  "gapIn": 0.125
}

Affiliate links, when shown, are labeled.

Source & last checked

Lumber span tables (verify grade)

Last checked: 2026-09-25

FAQ
Is this exact?

No. Site conditions, waste, and product coverage vary. Buy a little extra.

Do you sell materials?

No. Optional affiliate links are labeled when present.

Can I embed this?

Yes — see the embed box below.

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