How to use the Deck Calculator

Estimate decking rows and linear board feet from deck dimensions and board spacing.

Calculation formula

Board rows = ceil(deck width × 12/(board face width + gap)); total linear board feet = rows × deck length × (1 + waste%).

Recommended steps

1. Enter values using the units shown beside each field.
2. Review whether the example assumptions match your situation.
3. Run the calculator and compare the key metrics.
4. Use the source data or official rates when precision matters.

Known limitations

Assumes boards run the deck length, no butt joints and no rim/border waste; framing lumber is not included.