@JeremyECrawford Why can't you stack AC methods? Some foes end up with enormous hit bonus. Many things use VS a stat so it seems reasonable

— Dude Manguy (@SolarFlairPony) October 15, 2016

@SolarFlairPony @Super_Z3r0 What I’ve seen is 10 + armor + dex or 10 + stat mods. 10 + dex and con, why not also add wis for Barb+monk? We don't break it down that way. AC calculations are mutually exclusive & a PC's AC isn't meant to go super high

— Jeremy Crawford (@JeremyECrawford) October 17, 2016

@JeremyECrawfordAC calculations don’t stack (you have AC X + Y), but bonuses to AC do (like from a cloak of protection and a ring of protection). So a Sorcerer's AC from Draconic bloodline and Mage Armor don't stack, but Shield and either Sorcerer Blood/Mage Armor do?

— Joel McKinnon (@joeliemckinnon) October 16, 2016

@joeliemckinnon That's correct.

— Jeremy Crawford (@JeremyECrawford) October 17, 2016