4 bet and 5 bet sizings?

I try to 4bet 2.25x IP and 2.5x OOP, and 5bet almost always is just all in unless the 4bet is very small.

depends on:

a) size of the 3bet

b) effective stack depth

c) what you're trying to accomplish

d) position, as you alluded to

i often like to 4bet to ~18% of the effective stack, assuming not particularly deep, but again it depends.

IP say im UTG, open for 0.75 the button decides to 4 bet to 2.25 (assuming thats standard) I should 4 bet to 5.5 it im looking for value/ that could be a good 4 bet bluff size? or a bit bigger?

and say for exsample

ME UTG opens again 0.75 MP 3 bets to 2.25, button calls. what should 4 bets sizing be assume i have A,A

you dont really want to see a flop 3 way OOP but any 4 bet over 6.50 will just take it down unless your lucky enough that the MP 5 bets to get the button out.