Spiral Staircase Calculator
Calculate the dimensions and specifications for your spiral staircase design.
Staircase Dimensions
Results
Enter staircase dimensions and click Calculate to see results.
How to Use
- Enter the total rise (floor to floor height)
- Enter the staircase diameter
- Enter the number of steps
- Enter the total rotation in degrees (typically 360°)
- Enter the center pole diameter
- Enter the handrail height
- Click Calculate to get the staircase specifications
About Spiral Staircase Calculator
This calculator helps you determine the dimensions and specifications for your spiral staircase design.
Key Measurements:
- Rise per Step: Total rise ÷ Number of steps
- Run per Step: (π × Diameter) ÷ Number of steps
- Headroom: The vertical clearance above the stairs
- Handrail Length: The length of the handrail spiral
Building Code Requirements:
- Minimum headroom: 6'8" (80 inches or 203 cm)
- Minimum stair width: 26 inches (66 cm)
- Maximum rise per step: 9.5 inches (24 cm)
- Minimum run per step: 6 inches (15 cm)