Spiral Staircase Calculator
Calculate Spiral Staircase Requirements
About Spiral Staircase Calculator
This calculator determines spiral staircase dimensions and requirements, including tread sizes, rise, run, and structural specifications for spiral stair designs.
Design Considerations:
- Minimum Diameter: 5 feet for residential use
- Maximum Rise: 7.75 inches per step
- Tread Width: Minimum 7.5 inches at narrow end
- Headroom: Minimum 6 feet 6 inches clearance