Texas Access
State Licensed Registered Accessibility Specialists
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Surface Slope Conversions

Below is a list of surface slopes found in the 2012 Texas Accessibility Standards (TAS).

Ratio

Percentage

Relative Measurement

Sections Where Referenced:

1:48

2.0%

1/4" per foot (actually 2.083%)

304.2, 305.2, 403.3, 404.2.4.4, 405.3, 405.7.1, 502.4, 503.4, 504.4, 802.1.1, 810.2.4, 810.5.1, 1002.4.2, 1007.3.1, 1009.2.2, 1009.2.3, 1009.4.1, 1009.5.2, 1010.1

1:20

5.0%

19/32" per foot (actually 4.95%), or 5/8" per foot
(actually 5.2083%)

106.5, 402.2, 403.3, 403.6, 406.2, 505.1, 505.6, 1007.2, 1007.3.2

1:16

6.25%

3/4 per foot

1008.2.5.1

1:12

8.33%

1" per foot, or 6 of rise per 6 of run

240.2.1, 405.2, Table 405.2, 406.4

1:10

10.0%

5/16 per 3 , or 5/8 per 6, or 1-3/16" per foot
(actually 9.9%)

Table 405.2, 406.3

1:8

12.5%

3/8 per 3, or 1-1/2 per foot

Table 405.2, 1002.2

1:4

25%

1/4" per inch, or 1 per 4

1007.2

1:2

50%

3/8 per 3/4, or 1/2 per inch

303.3, 404.2.5