What do you generally call an all-in preflop with?

Title pretty much says it all but I'd also like to add categories to this.

1)All in is >50% of you stack

2) All in is <50% of your stack

Yesterday I PFR'd 5xBB with KK, buddy reraised me all-in and I called (about 75% of my buy-in) and he won when his AQ hit the river.

Another situation, I raised 5xBB with TT and a guy re-raised all-in and I called it was 25% of my stack. I ended up winning when his AJ missed.

Are you in a ring or tournament? (Your examples sound like tournaments.)

Who is it that moved in on you? Are the loose, tight, short stacked, drunk, stoned etc...?

When they moved in did they do it from UTG, Button, or somewhere in between?

How many people were already in the pot and were they all limpers or raisers?

What odds are the pot offering on the call?

Add up all of the above factors and make and educated guess. It is foolish to say only call AI with A, B, or C hands.

Here's an extreme example: Let's say you are big stack in tournament with 27o in the BB. Everyone folds to Smallest stack who can't cover the next blind goes AI from the Button. Blinds and antes offer you sleightly less that 1:1 pot odds or your call. What do you do? Hell, call his AI w/ 72o. I've seen it done many times and I've seen 72o knock out the short stack.

Tourny play is much more complicated overall, but calling AI is always a much graver decision that being the first one to push because of the gap concept ie. you need a better hand to call a raise with than you do to put in the first raise yourself.

In a ring game, try to avoid it unless you have the AA, KK or QQ.

yeah if tourneys we need way more info, are you in a blind, did you raise before the AI, limp, yet to act, blind size, other limps in pot... something.

QQ is a terrible all in hand against a solid player. At best its a cointoss.

Sorry this is just general ring play. I should of posted in Holdem Strategies. In both situations I was in EP/MPish and the all-in came from CO/button area.

in general ring i would say AI with KK or AA only. I guess it depends on how deep you are compared to them

I won't call my stack into the pot with anything less than K-K usually, unless I'm relatively short-stacked.