Handicap Ramp Slope
The ADA says that for public ramps, ramps should have a slope of at least 1:12. That means that for every inch of height, there should be 12 inches/1 foot of ramp length. So, if your stairs are 15 inches high, you need 15 feet of ramping to be safest for most users.
While those walking or using power mobility devices can likely have a steeper slope than 1:12, we strongly recommend that those using manual wheelchairs stick to 1:12, whether you use the chair yourself or with a caregiver.
However, not every slope is a safe slope. A ramp that feels like you’re climbing a mountain isn’t helping you regain your independence! If you use a mobility device, refer to your manufacturer’s guidelines on safe slopes.
Use the chart below to determine the appropriate ramp length. Any slopes in RED should be avoided wherever possible.
While the ramp slope is the most important factor to get right, it’s not the only component that makes a ramp safe. Platforms, turns, and resting areas are also crucial to ramp safety