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Spiral Stair Geometry Calculator Check local building codes Geometric calculator only. Check local building codes.

Total Rise
Ideal Rise
Actual
Inside Radius
Tread Length
Rotation °
Tread Depth at
from inner
Widen outer tread
 








Rotation
Inside Radius


Steps
 







Running Measurements explanation

Inside Stringer = tread points winding up and around INSIDE of stairs from top of first rise to upper floor.

Outside Stringer = tread points winding up and around OUTSIDE of stairs from top of first rise to upper floor.

Inside Plumb = tread points vertically (plumb).

Inside Level = tread points around INSIDE LEVEL, (or flat, as marked AROUND a circle on the floor.)

Running Measurements:

Inside Stringer

Mark-out
Outside Stringer

Mark-out
Inside Plumb

Mark-out
Inside Level

Mark-out



Measure at scale Left click, release and drag to measure at scale inside diagram.





Spiral Staircase Handrail True Radius Calculator Enter actual rise of handrail for entered angle of rotation.

Flat Radius to Handrail
Angle of Rotation
Total Height for Rotation




Follow Local Building Regulations Be sure to follow local building regulations regarding all stair dimensions.



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Create PDF files to print diagrams on current page. Print large images over multiple pages Printing to Scale Help and Plan Printing.

Slider Controls To fine tune Slider Controls click to select and use (cursor) keyboard keys.

Use your iPad or Android Tablet On-Site Your iPhone or Android is a valuable On-Site tool!
Lay your device on an angled surface (roof ?) to directly measure angles and automatically calculate Roofing and Pitch Angle Apps.

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ph: (Australia) +61 7 40987645 mob: 0438 165 753

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ALWAYS CHECK WITH YOUR LOCAL BUILDING AUTHORITY BEFORE LAYING OUT OR BUILDING ANYTHING
AND FOLLOW ALL LOCAL CODES. VERIFY ALL DIMENSIONS AND ANGLES BEFORE CONSTRUCTION.
All calculators on this site are GEOMETRIC only. Check local regulations for sizes, spacings and all engineering requirements.


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