Wheelchair Ramp Length Calculator
Ramp length from rise using ADA slope ratios.
Enter your values
ⓘ Live results
Results
- Minimum ramp length
- 24 ft
- Slope angle
- 4.76°
- Intermediate landings needed (every 30 ft max)
- 0
Quick answer
ADA guidance requires at least 12 inches of ramp length for every 1 inch of rise, giving a maximum slope of about 4.8 degrees.
length = rise x slope ratio
How to use the Wheelchair Ramp Length Calculator
- 1Measure the total rise the ramp needs to overcome.
- 2Use a 1:12 slope ratio for ADA-compliant ramps, or gentler ratios for more comfort.
- 3Add a level landing at least every 30 feet of ramp run, and at top and bottom.
Worked example
Using the values the calculator loads with:
Inputs
- Total rise24 in
- Slope ratio1:12 (ADA standard)
Results
- Minimum ramp length24 ft
- Slope angle4.76°
- Intermediate landings needed (every 30 ft max)0
Frequently asked questions
What is the max rise between landings?
ADA limits a single ramp run to 30 inches of rise before requiring a landing.
Can a home ramp be steeper than 1:12?
Some residential exceptions allow steeper slopes for very limited rise, but 1:12 remains the safest standard.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.