That's a very impressive calculator. I have written my own little one in Excel, too :)
It is indeed the case that mlvl/clvl calculation are before the lvl70+ penalty ones, but that's about the only thing i've looked into, code wise. They're all integer division btw, so rounded down, but unless you use the correct order you might never get the exact same numbers as the game uses. (I'm trying to find that out myself right now, posted at the PK). Also the mlvl >= clvl + 10 penalty is 2/256 now, this has changed from 1.09 to 1.10. The tables are in d2game.dll, at 6FD293A4 and 6FD293D0D0.
I had like a day to find out why a quill rat in normal (players 6) gives 1 exp and not 2 to a lvl 78 char. :D
It is indeed the case that mlvl/clvl calculation are before the lvl70+ penalty ones, but that's about the only thing i've looked into, code wise. They're all integer division btw, so rounded down, but unless you use the correct order you might never get the exact same numbers as the game uses. (I'm trying to find that out myself right now, posted at the PK). Also the mlvl >= clvl + 10 penalty is 2/256 now, this has changed from 1.09 to 1.10. The tables are in d2game.dll, at 6FD293A4 and 6FD293D0D0.
I had like a day to find out why a quill rat in normal (players 6) gives 1 exp and not 2 to a lvl 78 char. :D