L-Shaped Staircase Calculator (90 degree turn, Quarter turn)

Free professional L-shaped staircase calculator with drawings and 3D — tools to easy find stringer length, landing dimensions, steps rise and run.

Display
DU
CL
Staircase Type
LF
RG
Calculate Total Run Along
FTP
FBT
Stairs Dimensions, Stairwell
Y
X
SZ
Landing
LB
LT
Steps
QT
12
QB
2
SW
SF
SO
SP
Stringers
T
WI
Landing Support Joists
JT
JW
Risers
H
HT
AS
Support Posts
SB
Upper Floor Slab
SX
WX
ST
Balustrade
RH
BA
RT
RW
Wall
WT
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): 32.01 °
  • Comfortable Staircase Formula (R + G): 48.75 cm
  • Blondel's Formula (2R + G): 67.5 cm
  • Rise (Step Height): 18.75 cm
  • Tread Depth (Step Width): 35.5 cm
  • Going: 30 cm
  • Number of Steps: 15 pcs.
  • Stairway Width: 100 cm
  • Minimum Throat Depth: 14.1 cm
Materials for construction
Lower Stringers
  • Width: 30 cm
  • Length: 68.63 cm
  • Thickness: 4 cm
  • Quantity: 2 pcs.
  • Volume: 0.016 m3
Upper Stringers
  • Width: 30 cm
  • Length: 433.34 cm
  • Thickness: 4 cm
  • Quantity: 2 pcs.
  • Volume: 0.104 m3
Straight Steps
  • Tread Depth: 35.5 cm
  • Length: 100 cm
  • Thickness: 4 cm
  • Quantity: 14 pcs.
  • Volume: 0.199 m3
Risers
  • Width: 14.75 cm
  • Length: 100 cm
  • Thickness: 2.5 cm
  • Quantity: 15 pcs.
  • Volume: 0.055 m3
Landing
  • Width: 100 cm
  • Length: 105.5 cm
  • Thickness: 4 cm
  • Quantity: 1 pcs.
  • Volume: 0.042 m3
Landing Support Joists, Oriented along Lower Stringer
  • Width: 15 cm
  • Length: 100 cm
  • Thickness: 5 cm
  • Quantity: 3 pcs.
  • Volume: 0.022 m3
Landing Support Joists, Oriented along Upper Stringer
  • Width: 15 cm
  • Length: 100 cm
  • Thickness: 5 cm
  • Quantity: 3 pcs.
  • Volume: 0.022 m3
Balustrade
  • Handrail Width: 8 cm
  • Handrail Thickness: 4 cm
  • Balustrade Length: 521.52 cm
  • Volume: 0.017 m3
Balusters
  • Width: 5 cm
  • Length: 86.85 cm
  • Quantity: 15 pcs.
  • Volume: 0.033 m3
Newel Posts
  • Width: 8 cm
  • Length: 108.75 cm
  • Quantity: 1 pcs.
  • Volume: 0.007 m3
Support Posts
  • Width: 8 cm
  • Length: 52.25 cm
  • Quantity: 4 pcs.
  • Volume: 0.013 m3
Initial parameters
Display
  • Units: cm
  • Color drawing: color
Calculate Total Run Along
  • Upper Stairway:  selected
Stairs Dimensions, Stairwell
  • Total Rise: 300 cm
  • Total Run: 460 cm
  • Stairway Width: 100 cm
Landing
  • Landing Overhang along the Lower Stringer: 0 cm
  • Landing Overhang along the Upper Stringer: 0 cm
Steps
  • Quantity (Upper Stairway): 12 pcs.
  • Quantity (Lower Stairway): 2 pcs.
  • Thickness: 4 cm
  • Tread Overhang (Nosing): 3 cm
  • Tread Overhang (Side): 3 cm
Stringers
  • Thickness: 4 cm
  • Width: 30 cm
Landing Support Joists
  • Thickness: 5 cm
  • Width: 15 cm
Risers
  • Thickness: 2.5 cm
Support Posts
  • Width: 8 cm
Upper Floor Slab
  • Slab Overhang: 200 cm
  • Distance from Wall: 140 cm
  • 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 L-Shaped 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. Choose how to calculate total run — along upper stairway, FTP, along lower stairway, FBT.
  • Step 5. Input the stair, stairwell dimensions — total rise, Y*, total run, X, stairway width, SZ.
    * 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. Input the landing parameters — overlap landing along the lower stringer, LB, overlap landing along the upper stringer, LT.
  • Step 7. Input the landing support joists parameters — thickness, JT, width, JW.
  • Step 8. Input the support posts parameter — width, SB.
  • Step 9. Input the steps parameters — number of steps on upper stairway, QT, number of steps on lower stairway, QB, thickness, SW, nosing, SF*.
    * nosing = tread overlap
  • Step 9.1. Select to install the top step below 2nd floor level or keep it at the 2nd floor level, SP.
  • Step 10. Select to install risers or not, H.
  • Step 10.1. Input the risers parameter — thickness, HT.
  • Step 11. Input the stringers parameters — thickness, T, width, WI.
  • Step 12. Input the balustrade parameters — baluster width, BA, baluster height, RH, handrail thickness, RT, handrail width, RW.
  • Step 13. Input the upper floor slab parameters* — thickness, ST, overlap, SX, distance from wall, WX.
    * required for visualization only
  • Step 14. Input the wall parameter* — thickness, WT.
    * required for visualization only
  • Step 15. Please check all entered values, click the «Calculate» button and get a L-Shaped Staircase with Landing design.

 

Plans of Staircase 90° Turn — Layout Notations 

Drawing L-shaped Staircase with Landing
Drawing Quarter Turn Staircase with Landing
Optimal Step Size
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