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the Calculator will be available after changes in the relevant parameters.

Click "Calculate" to open the options window.

Choose Drawing:

Staircase Drawing (Side View)
Staircase Drawing (Front View)
Staircase Drawing (Top View)
Support Posts
Lower Stringer
Lower Stringer with Winders №1
Lower Stringer with Winders №1 (Pattern)
Intermediate Stringer with Winders
Intermediate Stringer with Winders (Pattern)
Upper Stringer with Winders №2
Upper Stringer with Winders №2 (Pattern)
Upper Stringer
Straight Step
Lower Winder Step
Intermediate Winder Step (Linear)
Intermediate Winder Step (Side)
Upper Winder Step
Risers of the Straight Steps
Risers of the Lower Winder Steps
Risers of the Intermediate Winder Steps
Risers of the Upper Winder Steps

Distance: 0

Calculation results

Staircase Dimensions

Angle: 32.01 °
Comfortable Staircase Formula (R + G): 43.33 cm
Blondel's Formula (2R + G): 60 cm
Rise: 16.67 cm
Tread Depth: 34.17 cm
Going: 26.67 cm
Number of Steps: 17 pcs.
Stair Width: 100 cm
Minimum Throat Depth: 15.87 cm

Lower Stringer with Winders

Minimum Throat Depth: 23.97 cm

Upper Stringer with Winders

Minimum Throat Depth: 21.49 cm

Intermediate Stringer

Minimum Throat Depth: 21.49 cm

Materials for construction

Lower Stringers

Width: 30 cm
Length: 155.11 cm
Thickness: 6 cm
Quantity: 2 pcs.
Wood Volume: 0.056 m3

Lower Stringer with Winders №1

Width: 40 cm
Length: 112.11 cm
Thickness: 6 cm
Quantity: 1 pcs.
Wood Volume: 0.027 m3

Intermediate Stringer

Width: 40 cm
Length: 216.06 cm
Thickness: 6 cm
Quantity: 1 pcs.
Wood Volume: 0.052 m3

Upper Stringer with Winders №2

Width: 37.52 cm
Length: 110.76 cm
Thickness: 6 cm
Quantity: 1 pcs.
Wood Volume: 0.025 m3

Upper Stringers

Width: 30 cm
Length: 198.6 cm
Thickness: 6 cm
Quantity: 2 pcs.
Wood Volume: 0.071 m3

Lower Winder Steps

Tread Depth: 66.2 cm
Length: 100 cm
Thickness: 4 cm
Quantity: 2 pcs.
Wood Volume: 0.053 m3

Intermediate Winder Steps

Tread Depth: 68.78 cm
Length: 139.03 cm
Thickness: 4 cm
Quantity: 2 pcs.
Wood Volume: 0.076 m3

Upper Winder Steps

Tread Depth: 56.68 cm
Length: 119.73 cm
Thickness: 4 cm
Quantity: 2 pcs.
Wood Volume: 0.054 m3

Straight Steps

Tread Depth: 34.17 cm
Length: 100 cm
Thickness: 4 cm
Quantity: 11 pcs.
Wood Volume: 0.15 m3

Risers of the Straight Steps

Width: 12.67 cm
Length: 100 cm
Thickness: 2.5 cm
Quantity: 11 pcs.
Wood Volume: 0.035 m3

Risers of the Lower Winder Steps

Width: 12.67 cm
Length: 100 cm
Thickness: 2.5 cm
Quantity: 2 pcs.
Wood Volume: 0.006 m3

Risers of the Intermediate Winder Steps

Width: 12.67 cm
Length: 106.3 cm
Thickness: 2.5 cm
Quantity: 2 pcs.
Wood Volume: 0.007 m3

Risers of the Upper Winder Steps

Width: 12.67 cm
Length: 105.99 cm
Thickness: 2.5 cm
Quantity: 2 pcs.
Wood Volume: 0.007 m3

Balustrade

Handrail Width: 8 cm
Handrail Thickness: 4 cm
Handrail Length: 369.01 cm
Wood Volume: 0.012 m3

Balusters

Width: 5 cm
Length: 86.85 cm
Quantity: 12 pcs.
Wood Volume: 0.026 m3

Lower Newel Post

Width: 8 cm
Length: 156.67 cm
Quantity: 1 pcs.
Wood Volume: 0.01 m3

Upper Newel Post

Width: 8 cm
Length: 106.67 cm
Quantity: 1 pcs.
Wood Volume: 0.007 m3

Support Posts

Width: 10 cm
Length: 859.33 cm
Wood Volume: 0.086 m3

Support Joist

Width: 15 cm
Length: 80 cm
Thickness: 5 cm
Quantity: 2 pcs.
Wood Volume: 0.012 m3
Joist Width №1: 15 cm
Joist Width №4: 15 cm

Initial parameters

Display

Units: cm
Drawing Color: color

Staircase Type

Left Turn: selected

Type of Winder Steps Connection to Newel Post

Tongue and Groove Joint: selected

Stairs Dimensions, Stairwell

Total Rise: 300 cm
Total Run: 260 cm
Stair Width: 100 cm

Calculate Total Run Along:

Upper Stairway: selected

Steps

Quantity (Lower Stairway): 5 pcs.
Quantity (Winders): 6 pcs.
Quantity (Intermediate Stairway): 0 pcs.
Quantity (Upper Stairway): 6 pcs.
Total Quantity: 17 pcs.

Risers

Thickness: 2.5 cm

Stringers

Thickness: 6 cm
Width: 30 cm

Stringers with Winders

Thickness: 6 cm
Width: 40 cm

Support Joist

Thickness: 5 cm
Width: 15 cm

Support Posts

Width: 10 cm

Upper Floor Slab

Thickness: 20 cm

Balustrade

Handrail Height: 90 cm
Baluster Width: 5 cm
Handrail Thickness: 4 cm
Handrail Width: 8 cm

Wall

Thickness: 20 cm

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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.