Ramp Slope Calculator

Reviewed by the CalculatorHub team, edited by James Graham. Method from ADA.gov (Americans with Disabilities Act Standards). Last verified 2026-06-23.

The Ramp Slope Calculator computes ramp slope from the relation ramp run ft = rise in x slope ratio / 12. It takes 2 inputs (vertical rise in in, slope ratio (run per unit rise)) and returns the ramp slope. Because this is a pure mathematical or physical formula rather than a jurisdiction-specific rule, the result never changes over time: the same inputs always produce the same answer, so you can rely on it whether you are checking homework, sizing a design, or sanity-checking another tool. Enter your values in the fields below and the result updates instantly; you can also share a permalink that pre-fills the exact calculation, which is useful for teaching, reports, or collaboration. For example, with vertical rise = 30 in, slope ratio (run per unit rise) = 12, the ramp slope works out to 30, and the worked example further down the page shows every step so you can follow the arithmetic and reproduce it by hand. The method is the standard form documented by ADA.gov (Americans with Disabilities Act Standards), and the figure above each result carries the date it was last verified. This tool is general information and is not a substitute for professional engineering, medical, financial, or scientific advice; always check critical results against the primary source and your own judgement.