🪵 Deck Calculator

Calculate deck boards, joists, and total board footage needed for your deck build.

Deck Dimensions

Deck Length (ft)

Deck Width (ft)

Board Width (in)

Joist Spacing (in OC)

Board Length (ft)

Waste (%)

Deck Building Basics

Deck boards should have 1/8" gap between them for drainage
Joists are typically spaced 16" on center for standard residential decks
Use 2x6 or 2x8 joists depending on span requirements
Always add 10% extra for waste and off-cuts
Consider using hidden fasteners for a cleaner look