[alanbrown]

Basically your pot equity is the probability that you will win the pot if there's no more betting from this point.

This is clearly a function of the hands you all hold. If you don't know their hands then you put them on a range. If, for instance the range you put them on is KK+,AK+ then your pot equity is how well your cards play against AA, KK, AKs and AKo. However, the average must be weighted correctly to account for the fact that there's more ways to deal AKo than AKs or AA. So calculating pot equity when you put villain on a range is only done accurately with s/w. Hence the recommendation of PokerStove.

If you have multiple villains that you're putting on differenct ranges then things get stickier even for poker stove and the best way to calculate it is for it to quickly deal out thousands of hands with villains getting holdings in their range and then seeing who won the pot how many times to calculate the equity.