Aggression Factor (AF) (AF)

Also known as: Aggression Factor, AF, Aggression Frequency

AF is (bets + raises) divided by calls postflop. High AF means an aggressive player; low AF flags a passive calling station. The AFq variant uses frequency instead.

The Aggression Factor (AF) measures postflop aggression as a ratio:

\[ \text{AF} = \frac{\text{bets} + \text{raises}}{\text{calls}} \]

Calculated across the flop, turn and river combined. The read is direct:

• High AF (≈ 3+): a betting/raising player who applies pressure — pair this with a healthy PFR to confirm a genuine aggressor rather than a spew-prone maniac.
• Low AF (≈ 1 or below): a passive player who calls far more than they bet — the signature of a calling station. Stop bluffing them and value-bet thinner and bigger.

AF has a known flaw: it ignores checks and is skewed by small samples (one big call session tanks it). The AFq (aggression frequency) variant fixes this by measuring aggressive actions as a share of all postflop actions — bets + raises ÷ (bets + raises + calls + folds) — which many players trust more. Read AF alongside VPIP to separate loose-passive fish from tight-aggressive regs.