Deck Calculator

Calculate deck boards, joists, support posts, and hardware for your deck building project.

Deck Length (ft)

Deck Width (ft)

Joist Spacing (in)

Cost per Sq Ft ($, optional)

Calculates deck boards based on 5.5-inch wide, 16-foot long boards and joists at your specified spacing.

Estimates support posts with one post per 8 feet in both directions, plus all required joist hangers.

Enter your cost per square foot to get a total project estimate. Typical deck costs range from $15-$35 per square foot for materials.

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