Find the number of deck boards spaced with gaps.
With a fixed gap, each board plus its gap occupies a set width, so the number of boards is the deck span divided by that repeating unit, rounded up. Deck boards are sold as full-length pieces, and spacing affects both ventilation and how many boards the frame requires.
Deck Board Spacing
Boards = (deck width x 12 + gap) / (board width + gap)
Boards = (deck width x 12 + gap) / (board width + gap) With a fixed gap, each board plus its gap occupies a set width, so the number of boards is the deck span divided by that repeating unit, rounded up.
Deck boards are sold as full-length pieces, and spacing affects both ventilation and how many boards the frame requires.
This calculator takes 4 inputs: Deck width, Board width, Gap between boards, Waste allowance. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.