if youd like to know the average chip stack for the final table that is easy in any tourney. Just take the (#of players registered X starting chip stack)/(9).
For full ring tourney. 6 man tourney just divide by 6 instead of 9. This will give you the average chip stack for each player at the final table in any tournament. It works for the freerolls too, usually they have anywhere from 500-750 people entered and i think you start with 1500 chips on ACR. So i.e. if 600 people started the freeroll it would be 600x1500 = 900,000 chips. divide by 9 = 100,000 chip stack avg at the final table. Works for any tourney and thats a good way to know if you have enough to blind yourself out around 25 or so people left if you have say 150,000 chips. BTW i think that is a good strategy to avoid coolers late in the tournament becasue i have ran into a few when ive had over 100,000 chips late and end up not making the final table because of it. So probably better to just let yourself blind out until you are ITM in the freerolls at least, i wouldnt' blind myself out of any real money
game though. Now just to make it TO the final table, thats a little more difficult becasue you don't have to have the avg chip stack. I mean you could just go on a guess that you need HALF the avg chip stack and therefore just divide the avg by 2 once you obtain that #, or if you think you can make it to the final table on 1/4 the avg divide by 4. In any case thats going to be a guessing game mostly becasue some people around the final table play tighter and some play much looser so its hard to say how high they would let the blinds get (or how many BBs they would wait to push on) or how aggressive they would play. Good luck in the future.