Spindle Spacing Calculator
Calculate the number of spindles for stair railings and deck railings. Enter rail length, spindle size, and spacing for code-compliant layout.
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Spacing Results
spindles Needed17
Actual Spacing3.92 in
Frequently Asked Questions
How many spindles for a 12 ft railing?
With 4" max spacing and 1.5" spindles: (144" / 5.5") = 26 spindles. Round to 26.
Are stair spindles different?
Yes. Stair spindles follow the stair angle. Measure along the slope and use the same 4" sphere rule projected vertically.
What code governs spindle spacing?
IRC R312.2 requires a 4" sphere not pass through. IBC 1015.2 requires 4" for commercial. Check local amendments.