# Metal Spiral Staircase Calculator

the Calculator will be available after changes in the relevant parameters.
Click "Calculate" to open the options window.
Switch interface
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
Switch interface
Choose Drawing:
Switch interface
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
Materials for construction
Steps
• 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
Center Column
• Diameter: 10 cm
Upper Floor Slab
• Thickness: 20 cm
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## How to Calculate Metal 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.