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ADA Ramp Grade Calculator

Slope %, run length, and ADA compliance check.

Compute the run length and slope percentage of an accessibility ramp from the rise. Reports whether the slope meets ADA's 1:12 maximum (8.33 %) for new construction and the recommended landing length.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

in

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Run = rise / (slope ratio); slope % = rise / run · 100. ADA max = 1:12 (≈ 8.33 %).

In depth

Compute the run length and slope percentage of an accessibility ramp from the rise. Reports whether the slope meets ADA's 1:12 maximum (8.33 %) for new construction and the recommended landing length.