Utilize our user-friendly Spiral Staircase Calculator to determine crucial dimensions for your project. Easily calculate the number of risers, actual riser height, tread run, and essential headroom clearance, ensuring a safe and compliant design.
Formula:
To design a spiral staircase, key dimensions are interconnected. Our calculator utilizes your input for Total Height (H), Outer Diameter (D), Central Pole Diameter (P), Desired Riser Height (Rhdesired), and Minimum Headroom (Hc) to derive:
- Number of Risers (Nrisers): Nrisers = ceil(H / Rhdesired)
- Actual Riser Height (Rhactual): Rhactual = H / Nrisers
- Number of Treads (Ntreads): Ntreads = Nrisers - 1
- Angular Rotation per Riser (θ): θ = 360° / Nrisers
- Walking Line Radius (Rwalk): Rwalk = (P/2) + ((D - P)/2) × (2/3)
- Tread Run at Walking Line (Trwalk): Trwalk = (2 × π × Rwalk × θ) / 360°
- Risers for Headroom Clearance (Nheadroom): Nheadroom = ceil(Hc / Rhactual)