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Deck Railing Calculator
Posts, rails and balusters for a deck railing run.
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Posts, rails and balusters for a deck railing run.
Deck Railing Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Posts = run/spacing + 1; balusters = run/spacing.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Deck Quick Guide
Typical values for reference.
| Run m | Post spacing | Baluster mm | Posts |
|---|---|---|---|
| 10 | 1.8 | 100 | 7 posts |
| 6 | 1.8 | 100 | 5 posts |
| 15 | 1.5 | 110 | 11 posts |
| 4 | 2 | 90 | 3 posts |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Deck Railing Calculator FAQ
Answers to common questions about this calculator.
Use the deck area or run length with the coverage or spacing shown.
Yes, 5 to 10 percent.
No, it is an estimate.
Your building control office.