Spindle / Baluster Spacing Calculator
This calculator helps you determine the number of spindles or balusters needed for your deck or stair railings, and calculates the optimal spacing between them to meet building code requirements.
Baluster Specifications
Section Configuration
Enter your specifications and click “Calculate Spacing” to see results here.
Frequently Asked Questions
How far apart should balusters be?
Most building codes require that balusters be spaced so that a 100mm (4-inch) sphere cannot pass through. This typically means the gap between balusters should be less than 100mm.
What unit should I use?
You can use either metric (millimeters) or imperial (inches) units. The calculator will automatically convert between them when you switch units.
Does stair angle affect number of spindles?
Yes, for stairs you need to calculate spacing along the diagonal run, not just the horizontal distance. Our calculator automatically accounts for this when you add a stair section.
How do I calculate for multiple sections?
Use the “Add Section” button to calculate for multiple railing runs. Each section can have different lengths and configurations.
Why Proper Spacing Matters
Proper baluster spacing is crucial for both safety and compliance with building codes. Gaps that are too wide can pose a safety hazard, especially for children and pets. Following code requirements ensures your railing system is both safe and structurally sound.
Additionally, proper spacing creates a visually appealing pattern that enhances the overall look of your deck or staircase.