Deck Calculator

Enter deck dimensions, board size, spacing, waste, and optional pricing to estimate decking materials.

Deck length (ft)

Deck width (ft)

Deck board width (in)

Gap (in)

Board length (ft)

Joist spacing (in)

Waste (%)

Price per board ($, optional)

—Deck area

—Deck boards

—Decking linear ft

—Joist lines

—Material planning estimate

Material estimate only. Structural spans, fasteners, beam/post sizing, guards, stairs, and code requirements depend on the project and local rules.

How to use this Deck Calculator

Estimate deck surface area, decking boards, joists, and material cost. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.