Frequently Asked Questions
What is the maximum ADA ramp slope?
The maximum running slope for an accessible ramp is one to twelve, meaning one inch of rise for every twelve inches of run. Gentler slopes such as one to sixteen or one to twenty are more comfortable and are always allowed.
When is a landing required?
A level landing is required after a maximum rise of thirty inches in a single ramp run, and also at any change of direction regardless of rise. Landings must measure at least 60 inches long to allow a wheelchair to maneuver. Landings let users rest and allow safe changes of direction.
Is this calculator a substitute for the ADA Standards?
No. It is a planning estimate only. Always verify your design against the current ADA Standards for Accessible Design and your local building code.
How wide does an ADA ramp need to be?
The minimum clear width is 36 inches between handrails. Landings at the top, at the bottom, and at any change of direction must be at least 60 by 60 inches to allow a wheelchair to turn.
Are handrails required?
Yes. Ramps with a rise greater than 6 inches need handrails on both sides, mounted between 34 and 38 inches above the ramp surface, with 12 inch extensions at the top and bottom.
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Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.