Deck Joist Calculator

DECKING v1.0

Joist count = ceil(deck width ft x 12 / spacing in) + 1. Standard deck joist spacing is 16 in OC (or 12 in OC for some decking materials).

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Deck Joists Needed
10 joists

Joist count = ceil(deck width ft x 12 / spacing in) + 1. Standard deck joist spacing is 16 in OC (or 12 in OC for some decking materials).

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Trin-for-trin-guide

1

Enter Deck Width

Input the deck dimension running perpendicular to the joists, in feet.

2

Select Joist Spacing

Choose 16 in OC standard spacing, or 12 in OC as required by some composite decking products.

3

Get Joist Count

View the total number of joists needed across that span.

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Ofte stillede spørgsmål (10)

Almindelige spørgsmål og svar om dette værktøj.

Many composite decking manufacturers require tighter 12 in OC joist spacing (versus the 16 in OC standard for wood) — always check your product's span rating.
No — this counts interior field joists only; rim joists around the deck perimeter should be added separately.
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