Wheelchair Ramp Slope Calculator

ADA standards require a maximum slope of 1:12 (one inch of rise per 12 inches of run) for wheelchair ramps in new construction. This calculator gives you the required ramp length, slope angle, and all ADA specifications for your project.

Ramp Specifications

Rise Height (vertical, inches)

Use Case

Available Space (run, inches)

Ramp Width Required

Minimum Run

0°

Slope Angle

1:12

Rise:Run Ratio

ADA ramp requirements (Section 405): max slope 1:12, max rise per run segment 30 inches, minimum width 36 inches clear, handrails required on both sides if rise exceeds 6 inches, landings at top/bottom (minimum 60" × 60"), edge protection required on open sides. Surface must be firm, stable, and slip-resistant.