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Spiral Staircase Calculator
Calculate tread count, riser height, and total rotation angle for spiral stairs
Spiral Stair Standard: Standard riser heights are targeted around $7.5\text{ inches}$. Each step typically adds $30^\circ$ of rotation (12 steps for a full $360^\circ$ circle).
Staircase Dimensions & Layout
Calculation Results
⚠️ Spiral staircases must comply with local building codes regarding minimum clear walking width, headroom clearance (typically 6 feet 6 inches minimum), and handrail height.