Ramp Slope (ADA)

Slope ratio, percent, and pass/fail against 1:12 maximum.

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Formula and source

Slope ratio (run:rise); 1:12 max per ADA Standards §405.2 (≤ 8.33% / 4.76°). Cross-slope ≤ 1:48 per ADA §403.3.

ADA Standards for Accessible Design (2010) §405; ICC A117.1-2017 by name.

Audience

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Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.