HUD Stats & Population Reads
A heads-up display (HUD) transforms raw hand history data into actionable statistics overlaid on your poker table. Understanding what each stat means, how they interact, and what population tendencies reveal about your opponents is one of the biggest edges available in online poker.
iGaming Journalist & Crypto Casino Analyst
Core Preflop Stats: VPIP and PFR
VPIP (Voluntarily Put Money In Pot) measures the percentage of hands a player enters the pot with, excluding the big blind posting. A typical winning player at 6-max NL Hold'em runs a VPIP between 22% and 28%. Players below 18% are nits who only play premium hands, while those above 35% are loose players entering too many pots.
PFR (Preflop Raise) tracks how often a player raises before the flop. The gap between VPIP and PFR reveals a player's tendencies: a small gap (e.g., VPIP 25 / PFR 22) indicates an aggressive player who rarely limps, while a large gap (e.g., VPIP 30 / PFR 12) signals a passive player who limps frequently and calls raises with weak holdings.
The VPIP/PFR combination is the single most important stat pair for categorizing opponents. A 22/19 profile at 6-max is a solid TAG (tight-aggressive) player. A 35/8 is a loose-passive calling station. A 14/12 is a tight nit. Each profile requires a fundamentally different counter-strategy.
Sample size matters enormously for preflop stats. You need at least 100 hands before VPIP and PFR become marginally reliable, and 500+ hands before you can make confident adjustments. At fewer than 50 hands, treat all HUD numbers as rough indicators rather than gospel.
Postflop Aggression: AF, AFq, and WWSF
Aggression Factor (AF) is calculated as (bets + raises) / calls. An AF of 2.0 means the player bets or raises twice as often as they call. Winning players typically show an AF between 2.0 and 3.5. An AF below 1.5 indicates a passive player who calls too much, while an AF above 4.0 suggests either a hyper-aggressive player or an insufficient sample size.
Aggression Frequency (AFq) is often more useful than AF because it includes folds in the denominator: (bets + raises) / (bets + raises + calls + folds). This gives a cleaner percentage that doesn't spike misleadingly when a player rarely calls. A winning AFq typically falls between 45% and 60%.
WWSF (Won When Saw Flop) measures how often a player wins the pot after seeing the flop, regardless of whether they won at showdown or via a fold. Population average is around 44-48%. Players above 52% are winning postflop players who either value bet effectively or bluff successfully. Players below 40% are losing postflop, usually because they call too much and fold too often to aggression.
These stats combine to paint a postflop picture. A player with a high AF, high WWSF, and moderate VPIP is dangerous — they pick good spots, apply pressure, and win pots. A player with a low AF, low WWSF, and high VPIP is a target — they enter too many pots passively and lose postflop.
Showdown Stats: WTSD and W$SD
WTSD (Went to Showdown) measures how often a player reaches showdown after seeing the flop. Population average at 6-max is roughly 25-28%. Players above 32% are calling stations who go to showdown too often with marginal hands. Players below 22% fold too easily to aggression and can be bluffed profitably.
W$SD (Won Money at Showdown) tracks how often a player wins when they do reach showdown. Population average is around 50-52%. A W$SD above 55% typically means the player is tight and only shows down strong hands. A W$SD below 46% signals someone who calls down too light and loses frequently at showdown.
The WTSD/W$SD pair is powerful for exploitation. A player with high WTSD and low W$SD is a calling station — value bet them relentlessly and never bluff. A player with low WTSD and high W$SD is a tight player who folds to pressure — bluff them frequently on later streets. A player with low WTSD and low W$SD has fundamental leaks in both directions and is the most profitable type to play against.
Population Tendencies at Different Stakes
At micro stakes (NL2-NL25), the population tends toward loose-passive play. Average VPIP runs 28-35%, PFR 12-18%, and players rarely 3-bet (3-bet percentage under 4%). Correct exploitation involves tightening your opening range, value betting thinner, and dramatically reducing your bluff frequency.
At low stakes (NL50-NL200), the population becomes noticeably tighter and more aggressive. Average VPIP drops to 24-28%, PFR rises to 18-22%, and 3-bet frequencies climb to 5-7%. Postflop play improves but remains exploitable, particularly on turns and rivers where many players either shut down or overbluff.
At mid stakes (NL500-NL1000), you encounter regulars who use HUDs themselves and understand population reads. Simple exploits stop working. You need positional stats (how someone plays from the button vs under the gun), board texture-specific tendencies, and multi-street analysis. At these stakes, having a HUD is table-stakes — the edge comes from interpreting the data better than your opponents.
Regardless of stakes, population data reveals that most players fold too often to river bets (around 55-60% fold frequency), c-bet too much on the flop (65-70% at lower stakes), and dramatically under-defend their big blind against steals. These leaks persist across all online poker populations.
Positional and Situational Stats
Advanced HUD setups break stats down by position. A player's button open-raise percentage versus their UTG open-raise percentage reveals their positional awareness. A solid player might open 45% from the button but only 15% from UTG. A weak player might open 25% from both positions, meaning they aren't adjusting.
Fold to 3-bet is one of the most profitable stats in poker. Population average is around 55-62%. If an opponent folds to 3-bets more than 65% of the time, you should 3-bet them relentlessly with a wide range including bluffs. If they fold less than 45%, you should tighten your 3-bet range to value-heavy hands.
C-bet stats by street tell you where an opponent's strategy breaks down. Many players c-bet 65-70% on the flop but only 40% on the turn and 30% on the river. This dramatic drop-off means they give up on bluffs quickly — you can float the flop lightly, knowing they'll check-fold the turn a majority of the time.
Check-raise frequency is another underused stat. Population average is only 6-8% on the flop. Players who check-raise above 12% are aggressive and dangerous. Players who never check-raise (below 4%) can be c-bet with impunity because they never fight back with strong hands.
Setting Up Your HUD Effectively
Start with a minimal HUD layout showing only VPIP, PFR, and total hands. Information overload is a real problem — a cluttered HUD with 20 stats distracts from actual decision-making. Add stats only as you understand how to use them and when the additional information changes your decisions.
A good intermediate setup includes VPIP, PFR, 3-bet%, fold-to-3-bet, c-bet%, fold-to-c-bet, WTSD, and W$SD. This eight-stat layout covers preflop tendencies, continuation betting habits, and showdown behavior — enough to categorize any opponent and make informed adjustments.
Color coding transforms raw numbers into instant pattern recognition. Set VPIP to turn green below 22% (tight), yellow at 22-30% (normal), and red above 30% (loose). Apply similar ranges to other stats. Within a few sessions, you'll identify player types at a glance without reading individual numbers.
Popup windows let you dig deeper during difficult decisions. Configure your HUD so that clicking a player's overlay opens detailed positional stats, flop texture c-bet rates, and multistreet aggression breakdowns. You won't need this information every hand, but in marginal spots involving significant pot sizes, the extra data can turn a guessing game into an informed decision.
Key Takeaways
VPIP/PFR is the most important stat pair — it instantly categorizes opponents as tight, loose, passive, or aggressive
You need 100+ hands minimum before trusting any HUD stat, and 500+ for confident adjustments
WTSD + W$SD together reveal whether to value bet or bluff an opponent — high WTSD with low W$SD means value bet relentlessly
Population tendencies like high fold-to-river-bet persist across stakes and represent consistent profit opportunities