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Stair Calculator

IBC / OSHA

1. Dimensions

ft in

2. Results

Code Requirements Guide

IBC (Commercial)
  • Max Rise: 7"
  • Min Tread: 11"
  • Headroom: 80"
  • Max Vert. Rise: 12'
IRC (Residential)
  • Max Rise: 7-3/4"
  • Min Tread: 10"
  • Headroom: 6' 8"
  • Max Vert. Rise: 12'
OSHA (Industrial)
  • Max Rise: 9.5"
  • Min Tread: 9.5"
  • Angle: 30-50°
  • Max Vert. Rise: 12'

Landing Requirements

Both IBC and OSHA require an intermediate landing if the total vertical rise between floors exceeds 12 feet (144 inches). If your rise is greater than this, you must split the stair into two flights.