Worked example
How Many Deck Boards for a 12x16 Deck?
This example embeds the deck board calculator with common 12 ft by 16 ft deck inputs so you can adjust the board size, gap, and waste factor.
Decking
Calculator inputs
Deck Board Calculator Results
Results update in your browser as you edit inputs. They are planning estimates, not complete shopping lists.
Enter project dimensions to calculate material quantity.
Inputs used in this example
- Deck size: 12 ft wide by 16 ft long.
- Board size: 5.5 in actual width by 16 ft length.
- Gap: 1/8 in between boards.
- Waste factor: 10%.
Expected output
The calculator estimates about 26 boards before waste and 29 boards after applying a 10% waste factor.
Formula explanation
- Convert board width and gap from inches to feet.
- Divide deck width by the board width plus gap to estimate board rows.
- Divide deck length by board length to estimate boards per row.
- Round up and apply the waste factor.
Main calculator
Use the full Deck Board Calculator to change dimensions, waste factor, and optional user-entered unit price.
FAQ
Can I use shorter deck boards?
Yes. Change board length in the calculator and it will recalculate boards per row.
Does this include framing lumber?
No. This example estimates deck surface boards only.