Commonly searched
Three railing calculators people look up most
Most railing projects start with one of these three before branching into a specific material or safety detail.
Full material list
Stair Railing Calculator
Full material list: posts, rail, balusters, and fasteners.
4-inch sphere rule
Baluster Spacing Calculator
Even spacing that meets code, plus total baluster count.
Code height
Handrail Height Calculator
Code-correct handrail height measured from the nosing line.
All 7 calculators
Browse by railing component
Grouped into three practical sets β core railing and heights, balusters and posts, and alternative railing materials.
Core Railing & Height 3
Balusters & Posts 2
FAQ
Common questions about stair railings
What's the difference between handrail height and guardrail height?
Handrail Height Calculator sizes the graspable rail you hold while walking the stairs, measured from the nosing line. Guardrail Height Calculator instead sizes the taller barrier required along open stair and landing edges to prevent falls β the two serve different code requirements and are often different heights on the same staircase.
Does Baluster Spacing Calculator also tell me how many balusters I need?
Yes β it returns total baluster count alongside the spacing itself, since the count is a direct output of spacing against your total rail length. This absorbed what used to be a separate Baluster Quantity Calculator, as the two were the same calculation run in reverse.
I want to start from scratch β where do I begin?
Stair Railing Calculator is the entry point: it returns a full material list covering posts, rail, balusters, and fasteners. From there, use Baluster Spacing, Handrail Height, or Newel Post for the finer details, or switch to Cable Railing or Glass Railing Panel if you're using a non-traditional material.
Do these calculators check code compliance, or just sizing?
These tools build height and spacing around common code thresholds like the 4-inch sphere rule, but they aren't a full pass/fail audit. For that, use the Code Compliance category once your railing design is set.
Keep going
Browse the other 9 categories
Once your railing design is set, these are the natural next stops β full layout planning, structural sizing, materials, code checks and cost.