You can calculate it.
2 table 1/2 300:
MIN - 300 max, 10 players, 0 rebuys = 3000 x 2 tables = 6000 + just in case 10% = 6600
MAX - 300 max, 10 players, 3 rebuys = 9000 x 2 tables = 18000 + just in case 10% = 19800
You could average it by saying 6600 + 19800 = 26400 / 2 = 13,200
or
You could play out say 1 buyin and 1 rebuy with 9 players:
5,400 x 2 tables = 10800
$1 x 300
$5 x 600 - 3000
$25 x 300 - 7500
$100 x 200 - 20000
$500 x 100 - 50000
bank: 80800 so .. YEP that would cover 2 tables
MAX - 500, 10 players, 3 rebuys = 20k + the other 20k = 40, the 80 will still cover.
You might consider the denoms.
300 x 1 is good if you have 3 tables running at once
People like lots of chips and most would rather have 200 in 'red' over 200 in 'green', so I would beef up your 5s based on this.
You're going to be dropping 5s so you need to beef up your 5s for this reason.
Dealers will color up the tips typically, so white will turn into red, will turn into green, black or the highest denom you have on the table, personally I request the houseman to take tips once I've colored up to black and have a few in my box.
we'll say you have 1 lively game, and say you're raking 10 per hand, call it 1 on 20.
if you don't pull 10, say its a short hand and there is 60 in the pot, the dealer should 'store' the 3 white chips that are raked in the 'box' (dealer chip tray), then as it grows to 5, drop the 5, yeah? meaning no white in the rake box
So lets say holdem and lets say 10 players and lets say 30 hands an hour, because if you're raking you want to put out as many hands as possible and you've invested in a shuffler and all of the players act when its on them.
so 30 hands @ 2 red chips per, every hour. that's 60 chips (300USD)
say you have a marathon session, and it goes 12 hours, so 720 chips total rake for 1 table.
Most of the underground games and charity game around me have about 2000 5s to run the game, regardless of plo or holdem, and that's just for 1 table. If you are seriously considering being able to run 3 tables, you'll likely want to grow a little more organically.
you're also going to want a drop box that you can pull and replace, there are several aspects to doing this, first know how many chips you're rake box can hold, the approximate amount of time it takes to fill up, and some sort of top and or process to obfuscate the contents from the players. So you don't want to dump it at the table, you'll want a replacement rake box.