What Is the ADA Stair Calculator?
Verify full ADA 504/505 compliance for commercial and public stairways. This calculator checks riser height, tread depth, nosing profile, handrail height, width, and extension requirements against the 2010 ADA Standards for Accessible Design.
How to Use This Calculator
- Enter all stair dimensions: rise, tread depth, width, nosing projection.
- Input handrail height and extension length.
- Review the pass/fail compliance check for each ADA requirement.
- Export the compliance report for your permit application.
Why Accurate ADA Stair Calculations Matter
ADA non-compliance in public buildings can result in Department of Justice enforcement actions, private lawsuits, and mandatory retrofits. Stairs in commercial buildings must meet both ADA 504/505 and local building code requirements.
Building Code References
Related Tools
Frequently Asked Questions
What are the ADA stair requirements?+
ADA 504 requires uniform risers between 4 and 7 inches, treads at least 11 inches deep, nosing radius ≤ ½ inch, and width ≥ 48 inches for means of egress. Handrails must be on both sides at 34–38 inches.