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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

Deck Length (ft)

Deck Width (ft)

Units

Deck Shape

Board Width (in)

Board Length (ft)

Gap Between Boards (in)

Custom Board Width (in)

Custom Board Length (ft)

Board Direction

Waste Factor (%)

Framing & Structure

Joist spacing, beam spans, and post layout

Joist Spacing (in o.c.)

Joist Size

Post Spacing (ft)

Beam Size

Deck Height (in above grade)

Material & Cost

Set prices and material type for full cost estimate

Decking Material

Price per Linear Foot ($)

Joist / Framing Price ($/LF)

Post Price ($ each)

Hardware / Fasteners ($ per board)

Currency Symbol

Quick Deck Presets

Summary

Total Material Cost

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Total

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Boards

Framing

Posts

Hardware

Deck Area—

Deck Boards—

Board Linear Ft—

Joists—

Posts—

Cost Items

Decking boards—

Framing—

Posts—

Hardware—

Material

Decking Calculator

Deck Dimensions

Framing & Structure

Material & Cost

Deck Layout Preview

Board & Framing Summary

Cost Breakdown