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).

Civil & Structural Engineering Tools

Inputs

Results

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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À propos et fonctionnement

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Deck Joist Calculator on Neranjan Tools is an ultra-fast, client-side utility crafted to deliver professional-grade processing without the privacy risks or upload delays of traditional cloud services. Whether handling sensitive business contracts, personal photos, or code snippets, you can accomplish your task in seconds.

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Guide étape par étape

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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Aide et base de connaissances

Questions fréquentes (10)

Questions et réponses courantes concernant cet outil.

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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Historique des versions

Version actuelle: v1.0
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