Baluster Calculator
Number of balusters and spacing for a railing from its length and baluster width.
Compare Your Options And Get Clear Answers
Number of balusters and spacing for a railing from its length and baluster width.
Baluster Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Baluster Quick Guide
Typical values for reference.
| Length in | Width in | Max gap in | Balusters |
|---|---|---|---|
| 36 | 1.5 | 3.9 | 6 balusters |
| 72 | 1.5 | 3.9 | 13 balusters |
| 96 | 1.5 | 3.9 | 18 balusters |
| 144 | 1.5 | 3.9 | 26 balusters |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Baluster Calculator FAQ
Answers to common questions about this calculator.
Commonly 4 inches (a 4 inch sphere must not pass).
Divide the free length equally between balusters.
n = ceil((length – gap) / (width + gap)); gap = (length – n x width) / (n + 1).
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.