At or above the minimum
A clear width of 32 inches or more meets the ADA 2010 Standards section 404.2.3 minimum of 32 inches for a doorway with a swinging door. Where the opening is deeper than 24 inches, the figure rises to 36 inches, so a deep reveal or a vestibule changes the answer.
Clear width is one requirement of several. Opening force, threshold height, hardware that works without tight grasping or twisting of the wrist, and manoeuvring clearance on both sides all have to hold as well, and a door can pass on width and still be written up.
Where this sits. ADA and Egress Door Compliance Upgrades.