Plan railing height, length and mounting posts for stairs.
The stair run gains a foot of extension at each end, and a post is placed at the ends plus every six feet along the run. Most codes set rail height from 34 to 38 inches above the nosing, so selecting the target up front keeps the rail code-friendly.
Handrail Height
Rail length = stair run + 2 ft of extensions; posts every 6 ft
Rail length = stair run + 2 ft of extensions; posts every 6 ft The stair run gains a foot of extension at each end, and a post is placed at the ends plus every six feet along the run.
Most codes set rail height from 34 to 38 inches above the nosing, so selecting the target up front keeps the rail code-friendly.
This calculator takes 2 inputs: Stair run, Rail height. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.