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Questions, corrections or feedback about the calculator are welcome. Email is the best way to reach us.
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We read every message but reply as time allows. If you are reporting an error in a calculation or a standards figure, please include the rise, run and slope you entered so we can reproduce it. For compliance-critical decisions, always verify against the 2010 ADA Standards and consult the relevant authority having jurisdiction (AHJ) or a qualified professional — see our Terms.