SB AF

Overview

SB AF stands for Small Blind Aggression Factor. It is a position-specific statistic derived from a player's overall Aggression Factor (AF), but filtered to only include hands played from the small blind (SB). It is commonly used in online poker tracking software to analyze a player's style from this disadvantageous position.

Aggression Factor Basics

Aggression Factor is calculated as:

AF = (Total Bets + Total Raises) / Total Calls

(Some trackers use a different formula, e.g., (Bet% + Raise%) / Call%, but the principle is similar.)

A higher AF indicates a more aggressive player who prefers to bet/raise rather than call. A lower AF suggests a passive or calling-oriented style. Typical values range from 0.5 (very passive) to 4.0+ (very aggressive), with average around 2.0–2.5.

SB AF Specifics

Because the small blind position is generally the most difficult to play profitably (you act first preflop and postflop, and you are often forced to invest money without seeing a flop), SB AF provides insight into how a player adjusts their aggression in this spot.

• High SB AF (e.g., >3.0) indicates a player who frequently raises or bets from the SB, rarely calling. This could mean they have a selective raising range (e.g., only strong hands) or they are overly aggressive and unbalanced.
• Low SB AF (e.g., <1.0) suggests a player who calls too often from the SB, possibly defending with too many weak hands and playing passively postflop.
• An average SB AF (around 2.0) typically indicates a balanced approach, though the ideal number depends on the player's overall strategy and opponent tendencies.

Strategic Use

Understanding SB AF helps you exploit opponents' tendencies:

• Against a player with high SB AF, you can expect them to raise often from the SB; you can adjust by 3-betting wider or folding more depending on their range.
• Against a player with low SB AF, they are likely to call too much; you can bet for value and bluff with careful sizing.
• Your own SB AF should be part of a balanced strategy: avoid being too passive (gives up equity) or too aggressive (becomes exploitable). Many strong players keep their SB AF between 2.0 and 3.0 while maintaining appropriate folding frequencies.

Limitations

• Sample size matters. SB AF is only meaningful after observing a sufficient number of hands from the small blind (at least 50–100, depending on the context).
• AF does not account for the strength of cards or board texture; it is a raw frequency metric.
• Different tracking software may compute AF slightly differently, so compare only within the same platform.

Related terms include Aggression Factor (AF), Small Blind (SB), Position, VPIP, and PFR.