U-Shaped Three-Flight Staircase with Four Winders Calculator

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Switch interface
Display
DU
CL
Staircase Type
LF
RG
Connection type Winder Steps to Newel Post
LOC
INT
Stairs Dimensions, Stairwell
Y
X
Z
Calculate Total Run Along
FTP
FMD
FBT
Steps
QB
4
QM
0
QT
6
SW
SF
SO
SP
Risers
H
HT
AS
Stringers
T
WI
Winder Stringers
IT
IW
Support Joists
JT
JW
Support Posts
SB
Upper Floor Slab
ST
Balustrade
RH
BA
RT
RW
Wall
WT
Switch interface
Choose Drawing:
Switch interface
Distance: 0
Calculation results
Staircase Dimensions
  • Angle (Slope/Pitch): 33.69 °
  • Comfortable Staircase Formula (R + G): 50 cm
  • Blondel's Formula (2R + G): 70 cm
  • Rise (Step Height): 20 cm
  • Tread Depth (Step Width): 34.8 cm
  • Going: 30 cm
  • Number of Steps: 14 pcs.
  • Stairway Width: 100 cm
Lower Stringers
  • Minimum Throat Depth: 13.36 cm
Upper Stringers
  • Minimum Throat Depth: 13.36 cm
Lower Winder Stringer №1
  • Minimum Throat Depth: 21.22 cm
Middle Winder Stringer
  • Minimum Throat Depth: 20.41 cm
Upper Winder Stringer №2
  • Minimum Throat Depth: 20.41 cm
Materials for construction
Lower Stringers
  • Width: 30 cm
  • Length: 142 cm
  • Thickness: 4 cm
  • Quantity: 2 pcs.
  • Volume: 0.034 m3
Upper Stringers
  • Width: 30 cm
  • Length: 224.31 cm
  • Thickness: 4 cm
  • Quantity: 2 pcs.
  • Volume: 0.054 m3
Lower Winder Stringer №1
  • Width: 40 cm
  • Length: 99.33 cm
  • Thickness: 4 cm
  • Quantity: 1 pcs.
  • Volume: 0.016 m3
Middle Winder Stringer
  • Width: 40 cm
  • Length: 198.37 cm
  • Thickness: 4 cm
  • Quantity: 1 pcs.
  • Volume: 0.032 m3
Upper Winder Stringer №2
  • Width: 40 cm
  • Length: 103.25 cm
  • Thickness: 4 cm
  • Quantity: 1 pcs.
  • Volume: 0.017 m3
Winder Step №1
  • Width: 100.67 cm
  • Length: 100 cm
  • Thickness: 4 cm
  • Quantity: 2 pcs.
  • Volume: 0.081 m3
Winder Step №2
  • Width: 84.63 cm
  • Length: 144.7 cm
  • Thickness: 4 cm
  • Quantity: 2 pcs.
  • Volume: 0.098 m3
Straight Step
  • Width: 34.8 cm
  • Length: 100 cm
  • Thickness: 4 cm
  • Quantity: 10 pcs.
  • Volume: 0.139 m3
Risers (Straight Steps)
  • Width: 16 cm
  • Length: 100 cm
  • Thickness: 1.8 cm
  • Quantity: 10 pcs.
  • Volume: 0.029 m3
Riser (Winder Step №1)
  • Width: 16 cm
  • Length: 100 cm
  • Thickness: 1.8 cm
  • Quantity: 2 pcs.
  • Volume: 0.006 m3
Riser (Winder Step №2)
  • Width: 16 cm
  • Length: 129.02 cm
  • Thickness: 1.88 cm
  • Quantity: 2 pcs.
  • Volume: 0.008 m3
Balustrade
  • Handrail Width: 8 cm
  • Handrail Thickness: 4 cm
  • Balustrade Length: 387.72 cm
  • Volume: 0.012 m3
Balusters
  • Width: 5 cm
  • Length: 86.86 cm
  • Quantity: 11 pcs.
  • Volume: 0.024 m3
Lower Newel Post
  • Width: 8 cm
  • Length: 150 cm
  • Quantity: 1 pcs.
  • Volume: 0.01 m3
Upper Newel Post
  • Width: 8 cm
  • Length: 110 cm
  • Quantity: 1 pcs.
  • Volume: 0.007 m3
Support Posts
  • Width: 8 cm
  • Total Length: 756 cm
  • Total Volume: 0.048 m3
Support Post №1
  • Width: 8 cm
  • Length: 116 cm
  • Volume: 0.007 m3
Support Post №2
  • Width: 8 cm
  • Length: 96 cm
  • Volume: 0.006 m3
Support Post №3
  • Width: 8 cm
  • Length: 96 cm
  • Volume: 0.006 m3
Support Post №4
  • Width: 8 cm
  • Length: 156 cm
  • Volume: 0.01 m3
Support Post №5
  • Width: 8 cm
  • Length: 156 cm
  • Volume: 0.01 m3
Support Post №6
  • Width: 8 cm
  • Length: 136 cm
  • Volume: 0.009 m3
Support Joist №1
  • Width: 15 cm
  • Length: 93 cm
  • Thickness: 5 cm
  • Quantity: 1 pcs.
  • Volume: 0.007 m3
Support Joist №4
  • Width: 15 cm
  • Length: 93 cm
  • Thickness: 5 cm
  • Quantity: 1 pcs.
  • Volume: 0.007 m3
Initial parameters
Display
  • Units: cm
  • Color drawing: color
Staircase Type
  • Left Turn:  selected
Connection type Winder Steps to Newel Post
  • Tongue and Groove Joint:  selected
Stairs Dimensions, Stairwell
  • Total Rise: 300 cm
  • Total Run: 280 cm
  • Stairway Width: 100 cm
Calculate Total Run Along
  • Upper Stairway:  selected
Steps
  • Quantity (Lower Stairway): 4 pcs.
  • Quantity (Winders): 4 pcs.
  • Quantity (Upper Stairway): 6 pcs.
  • Quantity (Middle Stairway): 0 pcs.
  • Total Quantity: 14 pcs.
Risers
  • Thickness: 1.8 cm
Stringers
  • Thickness: 4 cm
  • Width: 30 cm
Winder Stringers
  • Thickness: 4 cm
  • Width: 40 cm
Support Joists
  • Thickness: 5 cm
  • Width: 15 cm
Support Posts
  • Width: 8 cm
Upper Floor Slab
  • Thickness: 20 cm
Balustrade
  • Balustrade Height: 90 cm
  • Baluster Width: 5 cm
  • Handrail Thickness: 4 cm
  • Handrail Width: 8 cm
Wall
  • Thickness: 20 cm
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How to calculate Two-Quarter-Turn U-Shaped Stair with Four Winders (2+2 pcs)?

  • 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. Choose how to calculate total run — along upper stairway, FTP, along intermediate stairway, FMD, along lower stairway, FBT.
  • Step 5. Input the stair, stairwell dimensions — total rise, Y*, total run, X, stairway width, Z.
    * from the 1nd floor level to the 2nd floor level
    * total rise = stairwell height (if top step is on the 2nd floor level)
  • Step 6. Choose type of winder steps connection to newel post — tongue and groove joint, LOC, mounting inside the newel post, INT.
  • Step 7. Input the steps parameters — number of steps on upper stairway, QT, number of steps on intermediate stairway, QM, number of steps on lower stairway, QB, thickness, SW, nosing, SF*.
    *nosing = tread overlap
  • Step 7.1. Select to install the top step below 2nd floor level or keep it at the 2nd floor level, SP.
  • Step 8. Select to install risers or not, H.
  • Step 8.1. Input the risers parameter — thickness, HT.
  • Step 9. Input the stringers parameters — thickness, T, width, WI.
  • Step 10. Input the stringers with winders parameters — thickness, IT, width, IW.
  • Step 11. Input the support joists parameters — thickness, JT, width, JW.
  • Step 12. Input the support posts parameter — width, SB.
  • Step 13. Input the balustrade parameters — baluster width, BA, baluster height, RH, handrail thickness, RT, handrail width, RW.
  • Step 14. Input the upper floor slab parameter* — thickness, ST.
    * required for visualization only
  • Step 15. Input the wall parameter* — thickness, WT.
    * required for visualization only
  • Step 16. Please check all entered values, click the «Calculate» button and get a U-Shaped Staircase with Double Winders (2+2 pcs) design.

 

Plans of Double Turning U-Shaped Staircase (4 Winders) — Layout Notations 

Drawing U-Shaped Staircase with Double Winders (2+2 pcs)
Drawing U-Shaped Staircase with Double Winders (2+2 pcs)
Optimal Step Size
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