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Spiral Stair Geometry - Metric
Total Rise Tread Depth at
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Stair tread codes state that each tread will have a minimum tread depth at specified measurement from narrow edge of tread. CHECK LOCAL CODES (See tread diagram)
Ideal Rise
Actual Rise

Inside Radius
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Widen and overlap outer tread for Newel Post etc - Widened outer treads must overlap to form correct geometry
Tread Length
Rotation °

Rotation Inside Radius

Steps
 



Spiral stair calculator plan diagram with full dimensions

Spiral stair tread diagram with full dimensions



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 stair profile diagram with full dimensions

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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Check relevant local regulations for appropriate sizes, spacings and all engineering requirements.


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