U-shaped winder stairs (switchback, half turn staircase 180°) on stringers

U-shaped winder stairs (switchback, half turn staircase 180°) on stringers

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Choose Drawing:
Distance: 0

Calculation results

Staircase dimensions
  • Pitch (Angle): 32.01 °
  • Rise: 16.67 mm
  • Tread Depth: 34.17 mm
  • Going: 26.67 mm
  • Number of Steps: 17 pcs.
  • Stairs Width: 100 mm
  • Minimum Stringer Throat depth (width): 15.87 mm
Bottom Stringers of Winder Steps Block
  • fractureNorm: 23.97 mm
Upper Stringer of Winder Steps Block
  • fractureNorm: 21.49 mm
Middle stringer
  • fractureNorm: 21.49 mm

Materials for construction

Bottom Stringers (straight flight)
  • Maximum Width: 30 mm
  • Stringer Length: 155.11 mm
  • Thickness: 6 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.056 m3
Bottom Winder Stringer (lower)
  • Width: 40 mm
  • Length: 112.11 mm
  • Thickness: 6 mm
  • Quantity: 1 pcs.
  • Wood Volume: 0.027 m3
Middle stringer
  • Width: 40 mm
  • Length: 216.06 mm
  • Thickness: 6 mm
  • Quantity: 1 pcs.
  • Wood Volume: 0.052 m3
Upper Winder Stringer (upper)
  • Width: 37.52 mm
  • Length: 110.76 mm
  • Thickness: 6 mm
  • Quantity: 1 pcs.
  • Wood Volume: 0.025 m3
Upper Stringers (straight flight)
  • Width: 30 mm
  • Length: 198.6 mm
  • Thickness: 6 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.071 m3
Bottom Winder Step
  • Width: 66.2 mm
  • Length: 100 mm
  • Thickness: 4 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.013 m3
Middle Winder Step
  • Tread Depth: 68.78 mm
  • Tread Length: 139.03 mm
  • Tread Thickness: 4 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.019 m3
Upper Winder Step
  • Tread Depth: 56.68 mm
  • Tread Length: 119.73 mm
  • Thickness: 4 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.014 m3
Steps of Straight Flight
  • Tread Depth: 34.17 mm
  • Tread Length: 100 mm
  • Tread Thickness: 4 mm
  • Quantity: 11 pcs.
  • Wood Volume: 0.15 m3
Risers of Straight Flight
  • Width: 12.67 mm
  • Length: 100 mm
  • Thickness: 2.5 mm
  • Quantity: 11 pcs.
  • Wood Volume: 0.035 m3
Riser of Bottom Winder Step
  • Width: 12.67 mm
  • Length: 100 mm
  • Thickness: 2.5 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.006 m3
Riser of Middle Winder Step
  • Width: 12.67 mm
  • Length: 106.3 mm
  • Thickness: 2.5 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.007 m3
Riser of Upper Winder Step
  • Width: 12.67 mm
  • Length: 105.99 mm
  • Thickness: 2.5 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.007 m3
Balustrade
  • Handrail Width: 8 mm
  • Handrail Thickness: 4 mm
  • Baluster Length: 369.01 mm
  • Wood Volume: 0.012 m3
Balusters
  • Baluster Width: 5 mm
  • Length: 86.85 mm
  • Quantity: 11 pcs.
  • Wood Volume: 0.024 m3
Corner Newel Post (bottom turn)
  • Baluster Width: 8 mm
  • Length: 156.67 mm
  • Quantity: 1 pcs.
  • Wood Volume: 0.01 m3
Corner Newel Post (upper turn)
  • Baluster Width: 8 mm
  • Length: 106.67 mm
  • Quantity: 1 pcs.
  • Wood Volume: 0.007 m3
Supporting Posts
  • Width: 10 mm
  • Length: 859.33 mm
  • Wood Volume: 0.086 m3
Joists Supporting Stair Turn
  • Width (material): 15 mm
  • Length (material): 80 mm
  • Thickness: 5 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.012 m3
  • #1 Joist Width: 15 mm
  • #4 Joist Width: 15 mm

Initial parameters

Display
  • Units: cm mm
  • Color drawing: paint mm
Type of Stair
  • Left Turn:  selected
Type of winder steps connection to Newel Post
  • Dado joint (notched post):  selected
Flight
  • Total Rise: 300 mm
  • Total Run: 260 mm
  • Stair Width: 100 mm
Calculate Length of Stairwell Opening along:
  • Upper stair flight:  selected
Steps of Straight Flights
  • Number of steps, bottom flight: 5 pcs.
  • quantityWinder: 6 pcs.
  • Number of steps, Intermediate flight: 0 pcs.
  • Number of steps, upper flight: 6 pcs.
  • quantityTotal: 17 pcs.
Risers
  • Riser Thickness: 2.5 mm
Stringers of Straight Flight
  • Thickess: 6 mm
  • Width: 30 mm
Stringers of Winder Steps Block (turn part)
  • Thickess: 6 mm
  • Width: 40 mm
Joists Supporting Stair Turn
  • Thickness: 5 mm
  • Width: 15 mm
Supporting Posts
  • Post Width: 10 mm
Upper Floor Slab
  • Slab Thickness: 20 mm
Balustrade
  • Handrail Height: 90 mm
  • Baluster Width: 5 mm
  • Handrail Thickness: 4 mm
  • Handrail Width: 8 mm
Wall
  • Wall Thickness: 20 mm
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Help

KALK.PRO offers you free U-shaped stairs calculator. This type of staircase is also called half turn stairs or switchback stairs. From the top view the U shaped stairs resembles the letter “U”, it's name comes from the shape. Two parallel straight flights of the switchback stairs are separated by the winder steps block, turned by 180 degrees.


 The half-turn staircase has a lot of advantages, that determine its popularity in civil engineering. U-stairs are easy to fit small-space home's architectural plans, have an aesthetic appearance, not so difficult to build, comfortable and safe. 

Our U-shaped stairs calculator will help you to determine all significant dimensions for building a staircase online. It's also easy to use KALK.PRO switchback stairs calculator for stair layout and 3D visualisation.

Use our online tool to see your stairs plans in 2D from side to top. We also offer you an interactive 3D architectural visualization of your future staircase.

Please make sure your stair design complies with all local building codes and regulations requirements! It is very crucial step.

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Feedback about the calculator
Specify dimensions
Display
DU
cm
CL
color
Type of Stair
LF
RG
Type of winder steps connection to Newel Post
LOC
INT
Flight
Y
X
Z
Calculate Length of Stairwell Opening along:
FTP
FMD
FBT
Steps of Straight Flights
QB
5
QM
0
QT
6
SW
SF
SP
Risers
H
HT
Stringers of Straight Flight
T
WI
Stringers of Winder Steps Block (turn part)
IT
IW
Joists Supporting Stair Turn
JT
JW
Supporting Posts
SB
Upper Floor Slab
ST
Balustrade
RH
BA
RT
RW
Wall
WT