[SABR42]

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wow, i learnt something from this thread. So how is AF calculated?

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It's just the times they bet/raise over the times they call. Folding is not involved.

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Is there a formula to calculate someones relative aggression using vpip and AF?

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Usually players with higher VPIP tend to have lower AF, but it can vary from player to player. Some uber-nits have huge AF's because they play so few hands that they have overpairs and sets a large% of the time when they show strength.

Really loose players tend to have low AF's because they flop hands that they are likely to call with, rather than raise with. If someone has BOTH a huge VPIP and a huge AF, they are basically maniacs who are trying to win every pot. You can stack off against them with really weak made hands because they will usually have worse.