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Spindle Spacing Calculator — Free Online Tool
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Spindle Spacing Calculator

Calculate baluster count, exact gap spacing, and code compliance

Building Code Standard (IRC): Deck balusters must be spaced such that a 4-inch sphere cannot pass through any opening. Actual gap spacing is calculated evenly across the entire railing span.
Railing Span & Baluster Specs

Calculation Results

⚠️ Always verify local building code requirements, as some jurisdictions mandate strict 4-inch sphere tests for both stair and deck railings.

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