Deck Diagonal Board Calculator

Inputs

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Rectangular deck length measured along the main framing direction.
ft
Rectangular deck width.
ft
Angle of the boards from the deck length direction. Use 45 for common diagonal decking.
°
Actual installed board face width.
in
Planned gap between installed boards.
in
Length of one purchased deck board.
ft
Diagonal layouts usually need more cut-waste allowance than straight boards.
%
Optional unit price for material-cost estimate.
$/board

Results

Default result
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Boards to buy
30boards

Rounded up from linear decking divided by stock board length.

Also computed

Linear decking with waste465.9ft

Estimated board rows42rows

Longest diagonal runCaution16.97ft

If this exceeds stock length, plan butt joints, breaker boards or a different layout.

Deck area192ft²

Projected row width19.8ft

Board material cost540$

Method notes 3 notes
  • Projected row width = deck width * cos(theta) + deck length * sin(theta).
  • Linear decking is estimated from deck area divided by board-plus-gap coverage, then multiplied by the waste allowance.
  • This is a takeoff screen only. Picture-frame borders, breaker boards, exact splice layout, stairs, fascia and structural/code design are not included.

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