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Decking Calculator

Calculate decking boards, joists, posts, fasteners, and total material cost — with a live deck layout preview and full itemized bill of materials.

Add 10–15% waste factor for cuts  ·  Joist spacing: 12″, 16″ or 24″ o.c.

Deck Dimensions

Enter deck size, board specs, and spacing

Framing & Structure

Joist spacing, beam spans, and post layout

Material & Cost

Set prices and material type for full cost estimate

Summary

Total Material Cost
Total
Boards
Framing
Posts
Hardware
Deck Area
Deck Boards
Board Linear Ft
Joists
Posts

Cost Items

Decking boards
Framing
Posts
Hardware

Material