I'd say I generally 3bet a bit over 3x the open size and add some for every caller.
Also I give a lot of consideration to stack sizes and position. Bet sizing completely disguises my hand strength and naturally leads to me playing larger pots from position more frequently.ģbet sizing is more likely to be based on what my goal is: value, bluff, isolate, induce, etc. In NLHE (2-5 and 5-t size games) my rule is open for 4x bb, add 1bb for every limper, add 1bb if utg, less 1bb if btn. Depending on specifics about stack sizes, feeler bets, attempts to induce, etc. In plo my bet sizing pf is almost always pot for opens and about 75% pot for 3 bets.
