Are there formula’s for Warforged Armor? (Proficiency + Dex + 11 =AC)

The WarForged have 3 separate armor types of which from UA, that determine their AC, as armor has no effect on them nor does it stack. I was wondering if there was a Formula for me to utilize for the modifier section in the armor section below. Where it takes the current proficiency bonus and/or dex modifier (just PB for heavy armor) adds it to a number 11,13,16 and then determines my AC?

Formula like AC = dex + pb + number

This is on ROLL20 GIFFGLYPHS

DEX & pb

Armor and Modifier section

The Armor Types