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.

Display
DU
CL
Staircase Type
LF
RG
Staircase Dimensions
Y
D
RA
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 (Slope/Pitch): 24.38 °
  • Comfortable Staircase Formula (R + G): 49.4 cm
  • Blondel's Formula (2R + G): 69.4 cm
  • Rise (Step Height): 20 cm
  • Tread Depth (Step Width): 49.47 cm
  • Going: 29.4 cm
  • Rotation Angle: 360 °
  • Number of Steps: 15 pcs.
  • Stairway 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.
  • 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
  • Rotation 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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How to Calculate Spiral Stair?

  • Step 1. Choose the measurement units, DU — mm, cm, m, inches, feet.
  • Step 2. Choose the drawing color, CL — monochrome, color.
  • Step 3. Choose the staircase type — left turn, LF, right turn, RG.
  • Step 4. Input the stair, stairwell dimensions — total rise, Y*, staircase diameter, D**, rotation angle, RA.
    * from the 1nd floor level to the 2nd floor level
    * total rise = stairwell height (if top step is on the 2nd floor level)
    ** staircase diameter = stairwell diameter
  • Step 5. Input the steps parameters — quantity, Q, thickness, SW, tread radius around the central column, SF*.
  • Step 5.1. Select to install the top step below 2nd floor level or keep it at the 2nd floor level, SP.
  • Step 6. Input the center column parameter — metal rod diameter, POD.
  • Step 7. Input the upper floor slab parameter* — thickness, ST.
    * required for visualization only
  • Step 8. Please check all entered values, click the «Calculate» button and get a Spiral Steel Staircase design.

 

Plans of Spiral Staircase — Layout Notations 

Drawing Metal Spiral Staircase
Drawing Spiral Metal Staircase
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