Our ADA ramp length calculator determines the required ramp length for your project. Our calculator also tells you the number of resting platforms that you need to have to be ADA-compliant. As a guide, the ADA ramp requirements are 1 foot of ramp for every inch of rise for a 4.8° incline.
Ramp Length Calculator
A. Elevation height
The height from the ground up to the bottom of the door or existing walkway. (How to measure elevation)
B. Ramp run length
C. Total ramp system length in feet
Includes the minimum number of 5′ x 5′ resting platforms and the 5′ x 5′ platform at the top of the ramp.
D. Minimum number of resting platforms
A 5′ x 5′ (minimum) resting platform is needed every 30 feet of ramp.
+ 5′ platforms
A 5′ x 5′ (minimum) platform is needed at the top of the ramp if there is not an existing one already.
1:12 Slope: For every inch of height from the ground, you need 1 foot of ramp length to achieve a 4.8° incline.
Ramp length based on the number of stairs
| Steps | Total Length | Landing(s) | Ramp Run |
|---|---|---|---|
| 1 Step | 12′ | 5′ | 7′ |
| 2 Steps | 20′ | 5′ | 15′ |
| 3 Steps | 27′ | 5′ | 22′ |
| 4 Steps | 35′ | 5′ | 30′ |
| 5 Steps | 47′ | 10′ ( 2 x 5′) | 37′ |
Building codes specify riser heights of no less than 4″ and a maximum of 7 3/4″.
For ADA compliance, the estimated ramp length should be 20′ (5′ landing, 15′ ramp run)*
For ADA compliance, the estimated ramp length should be 27′ (5′ landing, 22′ ramp run)*
For ADA compliance, the estimated ramp length should be 35′ (5′ landing, 30′ ramp run)*
For ADA compliance, the estimated ramp length should be 47′ (2 5′ landings, 37′ ramp run)*