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10/10/2015 Spiral Stair Calculator - Set Out Circular Curved and Spiral Stair Geometry - Metric
http://www.blocklayer.com/Stairs/Spiral-Stairs.aspx 1/3
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Spiral Stair Geometry Calculator Geometric calculator only. Check local building codes.
Total Rise 2700
Ideal Rise 165
Actual Rise 168.8
Inside Radius 1500
Tread Length 2000
Inside Run 314.2
Tread Depth at 840
70% from inner
Draw Chords
Widen Outer 30
+ Step Step
Calculate
Inside Radius Lock
Total Rise 270016 Rises of 168.815 Runs (treads) at 314 inner ~ 733 outerOutside Diameter 7000Stair Angle Inner 28.2° ~ Outer 12.9°Rotation 180.4°Inner Stringer Length 5357 from top of first rise to upper floorOuter Stringer Length 11304 from top of first rise to upper floorLevel Chord Length Inner 3000 Outer 7000Tread Depth at 840 from inner 493Angle at 840 from inner 19°Handrail Radius ~ Inner 1931 ~ Outer 3685
Inside Run
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10/10/2015 Spiral Stair Calculator - Set Out Circular Curved and Spiral Stair Geometry - Metric
http://www.blocklayer.com/Stairs/Spiral-Stairs.aspx 2/3
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
357
714
1071
1429
1786
2143
2500
2857
3214
3572
3929
4286
4643
5000
5357
Outside Stringer
754
1507
2261
3014
3768
4522
5275
6029
6783
7536
8290
9043
9797
10551
11304
Inside Plumb
169
338
506
675
844
1013
1181
1350
1519
1688
1856
2025
2194
2363
2531
Inside Level
315
630
944
1259
1574
1889
2203
2518
2833
3148
3463
3777
4092
4407
4722
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.
10/10/2015 Spiral Stair Calculator - Set Out Circular Curved and Spiral Stair Geometry - Metric
http://www.blocklayer.com/Stairs/Spiral-Stairs.aspx 3/3
Flat Radius to Handrail 2000
Angle of Rotation 180
Total Height for Rotation 2800
Calculate
Handrail Rolling Radius 2397Handrail Rise Angle 24°Handrail Length 6879
A handrail (or reo) at a flat radius of 2000 that rises a total height of 2800mm in a rotation of 180°has a true (rolling) radius of ~ 2397 and a length of 6879
Be sure to follow local building regulations regarding all stair dimensions.
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