Decking Calculator

Plan your deck boards before you order. Enter the deck area, board width and length, and gap, and get the exact board count plus an estimated material cost.

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🔧 Board math

Rows = deck width / (board width + gap). Board count = rows x runs, with waste added.

💵 Cost estimate

See the board budget before you buy — wood or composite, priced by the piece.

📌 Standard sizes

Handles 2x4, 2x6, 2x8 lumber and composite boards with a 1/8" gap.

🔒 Private

All calculations run locally in your browser.

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