ADA Elevator Requirements Calculator

This calculator runs six independent pass/fail checks, drawn from the U.S. Department of Justice's 2010 ADA Standards for Accessible Design, and averages them into one ADA Compliance score, so each input only moves the checks its own dimension governs. Car Width Compliant checks Car Width against a minimum that itself depends on Door Type -- 80 in for center-opening doors, only 68 in for side-opening, matching Table 407.4.1's two published car configurations -- so the same 72 in car passes under side-opening and fails under center-opening; that threshold shift is Door Type's entire effect.

Door Width Compliant and Door Dwell Compliant are simple thresholds (36 in clear width, 3 seconds minimum dwell -- the latter taken directly from Section 407.3.5's "3 seconds minimum" door-delay requirement) that never interact with car dimensions at all: Car Width stays completely flat against Door Dwell Compliant across its full 30-120 in range, since dwell time depends only on Door Dwell Time. Controls Compliant is the one check that ISN'T a simple threshold -- it's a band (35-48 in), so raising Control Panel Height from a too-low value first turns the check compliant and then, past 48 in, turns it non-compliant again; a single "higher is better" reading of that output would be wrong on the upper half of its range. ADA Compliance (%) itself only ever rises or holds steady as each dimensional input increases from the defaults -- crossing a threshold flips one check from 0 to 1, worth about 16.7 percentage points each, and further increases beyond that threshold simply hold the score rather than reversing it (except through Control Panel Height's band, which can still pull the score back down past 48 in).