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Total Rise
Ideal Rise Actual
Inside Radius Decrease Inside Radius Increase Inside Radius
Tread Length
Inside Run  
Tread Depth at from inner
Widen outer trread  
Rotate     Rotate
<- fine   fine ->


Check local building codes Geometric calculator only. Check local building codes.




Inside Run

Rotate   Rotate
< fine   fine >

Decrease Inside Radius Rad Increase Inside Radius

 







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.



Calculates geometry for Spiral, Circular, Tower and Storage Tank Stairs.

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




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

Open new window containing only diagram images in current page ↓ This will better fit printed page. Printing to Scale Help
Print all diagrams on current page

Use your iPad or Android Tablet On-Site 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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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


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