Deck boards
Estimate decking with actual board size and gaps.
How this works
Divide deck width by board width plus gap, round rows up, then multiply by boards needed along each row. Add waste.
Example
Using the example inputs, whole decking boards is 25 boards.
- Length
- 12 ft
- Width
- 10 ft
- Actual board width
- 5.5 in
- Board length
- 12 ft
- Board gap
- 0.125 in
- Waste allowance
- 10 %
- Price per board
- 0 USD
- Whole decking boards
- 25 boards
Boards run along the deck’s length; unused offcuts are not reused.
Scope and assumptions
Decking surface quantity only. Does not design joists, beams, supports, spans, fasteners or guardrails.
Related quantity-calculation reference
Related calculators
Fence materials
Ramp slope geometry
Board feet
Even board spacing
Stair rise & run geometry