Slope / Length / Rise Chart

Inches of Rise 1:12 Slope* 1:8 slope* 2:12 Slope* 3:12 Slope*
3" ramp rise 3' ramp required 2' ramp required 2' ramp required 1' ramp required
4" ramp rise 4' ramp required 3' ramp required 2' ramp required 1' ramp required
5" ramp rise 5' ramp required 3' ramp required 3' ramp required 2' ramp required
6" ramp rise 6' ramp required 4' ramp required 3' ramp required 2' ramp required
7" ramp rise 7' ramp required 5' ramp required 4' ramp required 2' ramp required
8" ramp rise 8' ramp required 5' ramp required 4' ramp required 3' ramp required
9" ramp rise 9' ramp required 6' ramp required 5' ramp required 3' ramp required
10" ramp rise 10' ramp required 7' ramp required 5' ramp required 3' ramp required
11" ramp rise 11' ramp required 7' ramp required 6' ramp required 4' ramp required
12" ramp rise 12' ramp required 8' ramp required 6' ramp required 4' ramp required
13" ramp rise 13' ramp required 9' ramp required 7' ramp required 4' ramp required
14" ramp rise 14' ramp required 9' ramp required 7' ramp required 5' ramp required
16" ramp rise 16' ramp required 11' ramp required 8' ramp required 5' ramp required
18" ramp rise 18' ramp required 12' ramp required 9' ramp required 6' ramp required
20" ramp rise 20' ramp required 13' ramp required 10' ramp required 7' ramp required
22" ramp rise 22' ramp required 15' ramp required 11' ramp required 7' ramp required
24" ramp rise 24' ramp required 16' ramp required 12' ramp required 8' ramp required
26" ramp rise 26' ramp required 17' ramp required 13' ramp required 9' ramp required
28" ramp rise 28' ramp required 19' ramp required 14' ramp required 9' ramp required
30" ramp rise 30' ramp required 20' ramp required 15' ramp required 10' ramp required
* see slope reference below:
 
1:12 Slope (Or 9.85%, 5 degree incline)

1:8 Slope (Or 12.5%, 7 degree incline)

2:12 Slope (Or 16.7%, 9.5 degree incline)

3:12 Slope (Or 25%, 14.5 degree incline)

 

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