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In order to use this chart you will need to know:
1.  Type of wheelchair: 
     7 degree is recommended for manual wheelchairs.
     Power chairs may handle 12 to 15 degrees.  Please check with chair manufacturer.
2.  The Rise in inches that you need to access.
3.  Then match the Slope with your wheelchair type and Rise in inches.  This will give you the recommeded ramp length in feet.
Slope Degree RISE (IN) RAMP LENGTH (FT) Slope Degree RISE (IN) RAMP LENGTH (FT) Slope Degree RISE (IN) RAMP LENGTH (FT) Slope Degree RISE (IN) RAMP LENGTH (FT) Slope Degree RISE (IN) RAMP LENGTH (FT)
7 7 4.8 12 7 2.8 13 7 2.6 14 7 2.4 15 7 2.3
7 8 5.5 12 8 3.2 13 8 3.0 14 8 2.8 15 8 2.6
7 9 6.2 12 9 3.6 13 9 3.3 14 9 3.1 15 9 2.9
7 10 6.8 12 10 4.0 13 10 3.7 14 10 3.4 15 10 3.2
7 11 7.5 12 11 4.4 13 11 4.1 14 11 3.8 15 11 3.5
7 12 8.2 12 12 4.8 13 12 4.4 14 12 4.1 15 12 3.9
7 13 8.9 12 13 5.2 13 13 4.8 14 13 4.5 15 13 4.2
7 14 9.6 12 14 5.6 13 14 5.2 14 14 4.8 15 14 4.5
7 15 10.3 12 15 6.0 13 15 5.6 14 15 5.2 15 15 4.8
7 16 10.9 12 16 6.4 13 16 5.9 14 16 5.5 15 16 5.2
7 17 11.6 12 17 6.8 13 17 6.3 14 17 5.9 15 17 5.5
7 18 12.3 12 18 7.2 13 18 6.7 14 18 6.2 15 18 5.8
7 19 13.0 12 19 7.6 13 19 7.0 14 19 6.5 15 19 6.1
7 20 13.7 12 20 8.0 13 20 7.4 14 20 6.9 15 20 6.4
7 21 14.4 12 21 8.4 13 21 7.8 14 21 7.2 15 21 6.8
7 22 15.1 12 22 8.8 13 22 8.2 14 22 7.6 15 22 7.1
7 23 15.7 12 23 9.2 13 23 8.5 14 23 7.9 15 23 7.4
7 24 16.4 12 24 9.6 13 24 8.9 14 24 8.3 15 24 7.7
7 25 17.1 12 25 10.0 13 25 9.3 14 25 8.6 15 25 8.1
7 26 17.8 12 26 10.4 13 26 9.6 14 26 9.0 15 26 8.4
7 27 18.5 12 27 10.8 13 27 10.0 14 27 9.3 15 27 8.7
7 28 19.2 12 28 11.2 13 28 10.4 14 28 9.6 15 28 9.0
7 29 19.8 12 29 11.6 13 29 10.7 14 29 10.0 15 29 9.3
7 30 20.5 12 30 12.0 13 30 11.1 14 30 10.3 15 30 9.7
7 31 21.2 12 31 12.4 13 31 11.5 14 31 10.7 15 31 10.0
7 32 21.9 12 32 12.8 13 32 11.9 14 32 11.0 15 32 10.3
7 33 22.6 12 33 13.2 13 33 12.2 14 33 11.4 15 33 10.6
7 34 23.3 12 34 13.6 13 34 12.6 14 34 11.7 15 34 11.0
7 35 23.9 12 35 14.0 13 35 13.0 14 35 12.1 15 35 11.3
7 36 24.6 12 36 14.4 13 36 13.3 14 36 12.4 15 36 11.6
7 37 25.3 12 37 14.8 13 37 13.7 14 37 12.8 15 37 11.9
7 38 26.0 12 38 15.2 13 38 14.1 14 38 13.1 15 38 12.2
7 39 26.7 12 39 15.6 13 39 14.5 14 39 13.4 15 39 12.6
7 40 27.4 12 40 16.0 13 40 14.8 14 40 13.8 15 40 12.9
7 41 28.0 12 41 16.4 13 41 15.2 14 41 14.1 15 41 13.2
7 42 28.7 12 42 16.8 13 42 15.6 14 42 14.5 15 42 13.5
7 43 29.4 12 43 17.2 13 43 15.9 14 43 14.8 15 43 13.9
7 44 30.1 12 44 17.6 13 44 16.3 14 44 15.2 15 44 14.2
7 45 30.8 12 45 18.0 13 45 16.7 14 45 15.5 15 45 14.5
7 46 31.5 12 46 18.4 13 46 17.0 14 46 15.9 15 46 14.8
7 47 32.2 12 47 18.8 13 47 17.4 14 47 16.2 15 47 15.1
7 48 32.8 12 48 19.2 13 48 17.8 14 48 16.5 15 48 15.5