Industrial Stair Calculator

The stair calculator ISO 14122

A Streamlit-based tool for calculating and verifying industrial stairs and stepladders per ISO 14122-3:2016.

Features

• Geometry calculation from step count (N), tread (g) and overlap (r)
• Bottom platform (B), bottom offset (Pdown) and top offset (Pup) support
• Automatic type detection: Stairs (20°–45°) or Stepladders (45°–75°)
• ISO 14122-3 compliance checks:
  • Inclination angle
  • Blondel formula (600 ≤ g + 2h ≤ 660)
  • Minimum tread depth (g)
  • Maximum riser height (h)
• Side-view SVG visualization with dimensions (H, L, angle, B, Pdown, Pup)
• Real-time feedback — compliant steps in blue, violations in red

Demo is here