Ramp Slope Calculator

Ramp Slope Calculator — ADA Rise & Run
TOOL — RAMP-01

Ramp slope calculator

Enter the vertical rise of a proposed ramp. The minimum compliant run fills in automatically at a 1:12 slope — adjust it to check any other ratio against ADA Standards for Accessible Design (2010), section 405.

Ramp dimensions

Vertical height the ramp climbs
in
Horizontal length of the ramp surface — auto-filled to the 1:12 minimum, editable
in

Schematic — angle exaggerated for legibility, not to scale

Slope & compliance

This tool estimates compliance with the running-slope, rise, and handrail thresholds in ADA Standards §405. It does not check cross slope in the field, surface materials, landing dimensions at turns, or state and local codes, which can be stricter than federal minimums. Confirm any design against the full standard and your local building official before construction.