Count railing posts and check the actual spacing.
Posts must sit within a maximum spacing, so dividing the railing length by that limit and adding one gives the minimum post count. Rail posts are load-critical and spacing limits are code-mandated, so verifying count against the length avoids weak sections.
Railing Post Spacing
Posts = railing length / max spacing + 1
Posts = railing length / max spacing + 1 Posts must sit within a maximum spacing, so dividing the railing length by that limit and adding one gives the minimum post count.
Rail posts are load-critical and spacing limits are code-mandated, so verifying count against the length avoids weak sections.
This calculator takes 3 inputs: Railing length, Max post spacing, Number of sides. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.