The regulation degree of incline for a handicap-accessible ramp is 1:12. This means no incline steeper than 1 inch of ramp rise for every 12 inches of ramp length according to the Americans with Disabilities Act Standards for Accessible Design.
In addition, ADA Guidelines require flat rest areas at the top and bottom of the ramp, no smaller than 5 feet long and 5 feet wide, and a ramp width of at least 36 inches. If the wheelchair run is long, ADA Guidelines require no more than 30 feet of length before a rest area. If the wheelchair is required to turn, a turn platform of 5 feet by 5 feet must be provided.