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Stair Angle Calculator

Average stair angles range 35.5º to 42.5º.
Stair Angle Calculator
Risein.  Runin.
Your stair angle is degrees.
Average Stair Rise and Run Table
Rise
(inches)
Run (tread length less nosing in inches)
9"
9-1/4"
9-1/2"
9-3/4"
10"
10-1/4"
10-1/2"
10-3/4"
6-3/4"
36.9
36.1
35.4
7"
37.9
37.1
36.4
35.7
7-1/4"
38.9
38.1
37.3
36.6
35.9
7-1/2"
39.8
39.0
38.3
37.6
36.9
36.2
35.5
7-3/4"
40.7
40.0
39.2
38.5
37.8
37.1
36.4
35.8
8"
41.6
40.9
40.1
39.4
38.7
38.0
37.3
36.7
8-1/4"
42.5
41.7
41.0
40.2
39.5
38.8
38.2
37.5
8-1/2"
42.6
41.8
41.1
40.4
39.7
39.0
38.3

 
 
 
 
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