Ramp Calculator
Building an accessible ramp requires precise dimensions to meet ADA (Americans with Disabilities Act) standards and ensure safe, comfortable use for wheelchair users and people with mobility challenges. This calculator determines ramp length, number of landings, total footprint, and railing requirements based on rise height and slope ratio.
ADA standards require a maximum slope of 1:12, meaning 1 inch of rise for every 12 inches of run. A 30-inch rise requires a 30-foot ramp. This gentle slope ensures wheelchair users can navigate the ramp independently without excessive effort or risk of rollback.
Intermediate landings are required every 30 feet of ramp run. Landings must be at least 60 inches long and the full width of the ramp. Top and bottom landings are always required. Landings provide rest areas and are necessary at changes in direction. If the ramp changes direction at a landing, the landing must be at least 60 x 60 inches.
Handrails are required on both sides of any ramp with more than 6 inches of rise. Rails must be 34-38 inches high, extend 12 inches beyond the top and bottom of the ramp, and return to the wall or post. The minimum clear width between handrails is 36 inches. For residential ramps not subject to ADA, steeper slopes (1:8) are permissible but less comfortable for wheelchair users.