Free construction calculator

Deck Calculator

Estimate decking boards, framing lumber and material cost for your deck project.

Deck Length (ft)

Deck Width (ft)

Deck Board Width (in)

Deck Board Gap (in)

Joist Spacing (in)

Price Per Deck Board ($)

Price Per Joist ($)

Waste allowance (%)

How this estimate works

Enter the deck size, board size, joist spacing, and prices to estimate the number of boards and joists you will need. The tool applies your selected waste allowance to help cover cutting loss and minor mistakes.