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Stair Angle Calculator

Average stair angles range 35.5º to 42.5º.
Stair Angle Calculator
Rise = in.  Run = in.
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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