Ramp Slope Calculator

Convert ramp rise and run into slope ratio, percent grade, and angle. Includes a clear 1:12 ADA-style planning reference note for early layout checks.

Rise (in)Run (in)

A common ADA-style planning reference is 1:12, which means 1 inch of rise for every 12 inches of horizontal run. Use it as a planning check only. Real projects can also require landings, handrails, clear width, edge protection, and local code review.

Use this calculator only for preliminary geometry. It does not provide architectural, engineering, accessibility, legal, code, or safety advice. Do not build, purchase, or approve a ramp from the 1:12 label alone. Confirm current requirements, approved plans, manufacturer instructions, site measurements, and permits with the authority having jurisdiction and qualified design professionals. Inspect and maintain the completed route for safe conditions.