Spiral Stair Geometry Calculator
Geometric calculator only. Check local building codes.
Running Measurements explanation
= tread points winding up and around INSIDE of stairs from top of first rise to upper floor.
= tread points winding up and around OUTSIDE of stairs from top of first rise to upper floor.
= tread points vertically (plumb).
= tread points around INSIDE LEVEL, (or flat, as marked AROUND a circle on the floor.)
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.
Be sure to follow local building regulations regarding all stair dimensions.
If you're cutting blocks, concrete, stone or ANYTHING
and there's DUST - DON'T TAKE THE RISK
Don't cut it, or cut it wet so there's NO DUST
- Silicosis Sucks
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All calculators on this site are geometric only.
Check relevant local regulations for appropriate sizes, spacings and all engineering requirements.
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