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 Geometric calculator only. Check local building codes.
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Spiral Stair Geometry Calculator
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Running Measurements (explanation below)
Inside Stringer
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Outside Stringer
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Inside Plumb
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Inside Level
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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.)
Calculates geometry for Spiral, Circular, Tower and Storage Tank Stairs.
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