Pick a class and level, type your modifiers, and see what your proficiency ranks add up to. Every number is written out as its sum.
Proficiency adds your level plus 2, 4, 6 or 8 for trained, expert, master or legendary; untrained adds nothing. The item bonuses are the potency, armor potency and resilient runes (+1 to +3).
An outlined box is the level the rank goes up; your level is marked in the header. Hover over a box for its number. Number adds your attributes as they rise (and armor and Dex for armor), so DCs show as DCs; item bonuses are left out, as runes change with level. To compare one rank across every class, use Compare classes.