Spiral Stair Geometry Calculator
Geometric calculator only. Check local building codes.
Calculators - Estimators - Template Generators - Plans & Tools
Metric & Imperial
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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.
Total Height for Rotation
Be sure to follow local building regulations regarding all stair dimensions.
Printing to Scale Help
and Plan Printing.
To fine tune Slider Controls click to select and use ◄ ►
(cursor) keyboard keys.
Open new window containing only diagram images in current page. Create PDF files.
Your iPad, iPhone or Android Tablet or Phone is a valuable On-Site tool!
Lay your phone or tablet on an angled surface (roof ?) to directly measure angles and automatically calculate Roofing
and Pitch Angle Apps
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Questions or Suggestions? ph: +61 7 40987645
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
Copyright © Greg Tarrant - blocklayer.com