PokerStove is a very handy freeware poker equity calculator used for Texas Holdem. You can put your cards against an oppponent’s range of hands to calculate winning/equity percentages. This is especially useful in all-in situations when playing against a short stacked opponent to determine which hands you can profitably stack off against him.
The first thing we want to do once you’ve downloaded and installed the software is to assign pre-flop hands versus some ranges. There are a few different ways for you to assign a hand range to an opponent, but probably the easiest way is to just put in a percentage.
So, for example, if you know the opponent is likely to be raising pre-flop with 8% of his hands in the under the gun position, you put that 8% in. By doing this, it converts the percentage to a range. In other words, it would be the same as manually putting in (88+, ATs+, KTs+, QJs, AJo+). Against an 8% range, you can see AJ is a 40/60 underdog.