basic

Wheelchair Ramp Slope Calculator

Run, length, and slope for an ADA-compliant ramp.

Compute the run, hypotenuse length, and slope ratio of a wheelchair ramp from the rise (the height it must overcome). The ADA recommends at most 1:12 slope (1 inch of rise per 12 inches of run).

Nadia Almasri By Nadia Almasri
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

For ADA, run = rise × 12; length = √(rise² + run²); slope ratio = rise / run.

In depth

Compute the run, hypotenuse length, and slope ratio of a wheelchair ramp from the rise (the height it must overcome). The ADA recommends at most 1:12 slope (1 inch of rise per 12 inches of run).