Measure first
Measure finished dimensions, actual stock, openings, and site constraints before ordering material.
Railing layout
Baluster Spacing Calculator
Lay out evenly spaced railing balusters from the clear opening, baluster width, and your maximum preferred gap. The result gives a count and equal spacing for field marking.
How the estimate works
Use the number as a planning starting point.
The tool finds the smallest baluster count that keeps each equal opening at or below the chosen maximum gap, then reports the final edge and between-baluster spacing.
Check the result
A maximum gap is a safety and code matter. Verify the correct limit, rail geometry, attachment method, and local requirements for your project before installation.
Plan the next step
Use the related calculators below to turn a first estimate into a material list, layout, or a more detailed project plan.
FAQ
Common Baluster Spacing Calculator questions
What gap should I use between balusters?
Use the maximum opening required by the applicable local code; many residential projects use a value below 4 inches, but rules and measurement methods vary.
Does this account for sloped rails?
No. It is for a straight clear opening. A sloped rail needs layout verification along the rail and local-code review.
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