Terran mid-late game help!

[H2O ChiefRocka]

Hey guys as a random player I am weak on late game like srs bsns status. I just don't get enough practice. I need help on how much each base/expo can support x amount of rax,fax,ports with y units. I played a few games today with Terran and became late game, I usually do my infamous all in off two bases but I tried avoiding to play a macro game. Off 3 bases I found my self with 2k minerals and 1k gas, that's omgwtfbbq for me. As Protoss or Zerg My money/macro is great, as Terran when it gets to 3rd base I start failing =\..

Tl;dr what are some figures for Terran off 3 bases or more: example 12 rax if going mm, 8 rax 6 ports for marines banshee [made up numbers]. basically I need an estimate so I can actually know what I'm doing late game as Terran lol. I hate and try to avoid 2 base all in but sometimes I don't have a choice since I know I fail at 3 bases late game. Thanks!

[H2O Reborn]

what I really do for terran is.. when I see 200 minerals in my pockets, I make a barracks and if I still have 200 while producing out of that barracks, I would make a reactor, and if it still happens that I have over 200, I would make another barracks. and since you played me pvt I assume you know that it works quite well and I have, beaten top 500 players with terran before before masters was out a little over 2 months ago (accidently chose terran when I was going to ladder and ended up in a TvT :P)