Example
Input: 68" Rail, 1.5" Baluster
Result: 13 Balusters, 3.7" Gap
Step-by-Step Guide
1. Rail Length
Distance between posts.
2. Width
Baluster thickness.
3. Calc
Find equal spacing.
4. Layout
Mark centers.
What is Baluster Spacing Calculator?
Calculates the exact position of each baluster (spindle) to ensure equal gaps that meet building codes (usually < 4 inches).
👷 Builder's Tip: Measure twice, cut once. These calculations are theoretical; actual site conditions may affect requirements.
How it Works
1. Input 'Rail Length'.
2. Input 'Baluster Width'.
3. Tool iterates to find a gap size < 4".
4. Outputs center-to-center spacing.
FAQ
What is the 4-inch rule?
A safety code requiring gaps to be less than 4 inches to prevent children from slipping through.
Stairs vs Deck?
Stairs apply the rule to the horizontal distance between balusters.
Center or Edge?
Layout is usually done On-Center (OC) for speed.
Max spacing?
Always aim for ~3.5-3.8 inches to be safe.
Uneven ends?
This tool centers the layout so end gaps are equal.
Conclusion
Code Compliance: The '4-inch sphere rule' means a 4-inch ball cannot pass through any point in the railing. This calculator ensures compliance and symmetry.