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Deck Material Calculator

Estimate deck area and board quantity.

MyToolPantry.comDeck Material Calculator

Deck Material Calculator result

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Scenario AAll assumptions are visible.
Primary result29Full deck boards
Deck surface192 sq ftDeck-board linear feet451 ftFull deck boards29Estimated joists10Estimated listed lumber$886.00
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Formula, assumptions & limitations

Inputs used: Deck length (ft); Deck width (ft); Board face width (in); Board length (ft); Gap between boards (in); Waste (%); Price per board ($); Joist spacing (in); Joist length (ft); Price per joist ($).

Method: Surface area is converted to board linear feet using board face plus gap, then waste and whole-board rounding are applied. Joists use selected spacing.

This is a material-planning estimate, not structural design. Excludes beams, footings, posts, stairs, railing, blocking, fasteners, permits, labor, delivery, and tax.

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How this tool works

Deck area equals length × width; board coverage, spacing, orientation, and waste determine the estimated board quantity.

Limits to know

This is a surface-lumber estimate, not structural design. Joist spans, beams, posts, footings, ledgers, stairs, guards, blocking, fasteners, loads, species, hardware, permits, and local code need a qualified design.