Deck Calculator
Deck boards, joists and screws for a rectangular deck.
Runs in your browser — nothing is uploaded—
Details
Material estimates only — add waste, confirm quantities with your supplier and follow local building codes. Not an engineering guarantee.
How to use Deck Calculator
- Enter your values — the unit for each field is shown next to it.
- The result updates instantly as you type.
- Copy the results, or change inputs to compare scenarios.
Formula & assumptions
Rows = ⌈deck width ÷ (board width + gap)⌉; boards = ⌈rows × deck length × (1 + waste) ÷ board length⌉