The calculation, explained.
Board rows round up from (deck width in inches + gap) ÷ (actual board width + gap). Purchased full-length boards add the chosen allowance. This is a simple material estimate, not joist or structural design.
Review the example assumptions and results
- Deck width
- 10 ft
- Board run
- 12 ft
- Actual board width
- 5.5 in
- Gap
- 0.25 in
- Extra material
- 10 %
- Installed rows
- 21
- Full-length boards to buy
- 24
- Board length
- 12 ft
How this tool works
Adjust the labeled inputs to see a new calculation. Units and assumptions are shown beside each field. Printed and copied results use the same calculation.
This is a planning estimate, not a structural design, permit document or binding quote. Check product specifications and actual site measurements.
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