What is the proper handicap ramp slope to have?

To be easily manageable, a handicap ramp slope should be between 1:16 and 1:20. Anything steeper will make the use of the handicap ramp difficult, if not impossible, for some wheelchair users. In general, the least possible slope should be used. Increasing the length of the planned handicap ramp in order to allow for a lower slope is the best course of action. In a new construction, the maximum slope allowed by law is 1:12 and the maximum rise for a run is 30 inches. If space does not allow for a longer ramp, then the law allows for slopes greater than 1:12, but imposes restrictions on those situations as well.