Post-Justice MapleStory Calculator.

For my Paladin, the excel calculator goes:
min =(4*C27+D27)/100*E27*G$27*F$27
max =(4*C27+D27)/100*F$27*(E27)
(note that I'm not rounding in these calculations - both are rounded normally though, not with 'floor')

C27: total str =FLOOR(SUM(B2:B23)*(1+SUM(E2:E23)/100),1)
- B is str from gear & base, E is %str from gear
D27: total dex =FLOOR(SUM(C2:C23)*(1+SUM(F2:F21)/100),1)
- C is dex from gear & base, F is %dex from gear (rather %all, mostly)
E27: total attack =FLOOR(SUM(D223)*(SUM(G2:G23)/100+1),1)
- D is atk from gear & passives, G is %atk from gear
F$27: weapon multiplier =1.34
G$27: weapon mastery =0.66 it's less than normal cause my Paladin has level 18 mastery unbuffed (lolCObuild)

MW calculation just changes C27 and D27
C27 =FLOOR((SUM(B2:B22)+FLOOR(B28*B23,1))*(1+SUM(E2:E23)/100),1)
- B2:B22 are gear str, B23 is base str, B28 is MW's percentage, that is, 1.15 or whatever

 Spoiler

Aside from 'blessing' which actually includes Pirate's buff, Blessing of Cygnus, the 2nd job Warrior skill that adds stats, and that Maple Alliance buff, this is fairly well labeled.
Row 26 is showing potential-less stats, and evidently I forgot to match up mastery.