Spiral Staircase Calculator (Rotating / Round / Screw)

Spiral Staircase Calculator (Rotating / Round / Screw)

Build a spiral staircase with our free calculator — simple design round stairs in inch and metric units with detailed drawings, adaptive 3D.

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Display
DU
CL
Staircase Type
LF
RG
Staircase Dimensions
Y
D
A
Steps
Q
18
SW
SF
SP
Center Column
POD
Upper Floor Slab
ST
Error calculationPlease check your input
the Calculator will be available after changes in the relevant parameters.
Click "Calculate" to open the options window.
Choose Drawing:
Distance: 0
Calculation results
Staircase Dimensions
  • Angle: 24.38 °
  • Comfortable Staircase Formula (R + G): 49.4 cm
  • Blondel's Formula (2R + G): 69.4 cm
  • Rise: 20 cm
  • Tread Depth: 49.47 cm
  • Going (Run): 29.4 cm
  • Rotation Angle: 360 °
  • Number of Steps: 15 pcs.
  • Staircase Width: 95 cm
  • Minimum Headroom: 200 cm
Materials for construction
Steps
  • Tread Depth: 49.47 cm
  • Length: 109 cm
  • Thickness: 2 cm
  • Quantity: 15 pcs.
  • Wood Volume: 0.213 m3
Metal Rod
  • Diameter: 10 cm
  • Length: 300 cm
Initial parameters
Display
  • Units: cm
  • Color drawing: color
Staircase Type
  • Left Turn:  selected
Staircase Dimensions
  • Total Rise: 300 cm
  • Staircase Diameter: 200 cm
  • Angle: 360 degree
Steps
  • Quantity: 15 cm
  • Thickness: 2 cm
  • Tread Radius Around the Central Column: 4 cm
Center Column
  • Diameter: 10 cm
Upper Floor Slab
  • Thickness: 20 cm
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