Deck Calculator

Estimate decking boards needed for your deck project. Enter deck dimensions and board size to calculate materials.

Deck length (ft)

Deck width (ft)

Board width (in)

Board length (ft)

Enter deck dimensions.

How It Works

Number of boards = Deck width ÷ (board width + gap). Includes 10% extra for waste and cutting.

Example: 16×12 ft deck with 5.5″ boards (12 ft long).
Rows = 12ft ÷ 0.479ft ≈ 25 boards → with waste: 28 boards

Last updated: 2026-08-08