HUDs in Online Poker: What the Stats Actually Mean

A poker HUD displays 15-20 statistics for each opponent. Most players look at two: VPIP and PFR. Both numbers are useless without framework.

I designed poker software for five years before I saw a HUD. That was 2006. I built displays like a casino architect would: what does the eye need to land on first?

VPIP and PFR Basics

VPIP: Voluntarily Put In Pot. This is every hand where the player invested money preflop. It includes bets and calls.

PFR: Preflop Raise. How often they initiated a raise preflop.

If a player has 22 VPIP and 18 PFR, they're aggressive. They're entering 22% of hands and raising into 18% of those. That's a tight-aggressive player.

20 VPIP and 8 PFR is loose-passive. They enter 20% of hands but rarely raise.

The Critical Gaps

A 30 VPIP and 5 PFR player is a calling station. They enter a lot of pots but never raise. They have a crush-it range.

An 8 VPIP and 7 PFR player is a nit. They fold constantly and only raise strong holdings. You can steal from this player relentlessly.

A 35 VPIP and 32 PFR player is a maniac. They're in nearly every hand and raising constantly. This player can be profitable (if they're skilled) or a source of income (if they're not).

The Invisible Dimension: Sample Size

This is where 90% of HUD reading fails.

You see a new player: 28 VPIP, 2 PFR. You think, extreme calling station. You widened your own play massively.

Then you realize those stats are from 31 hands. He's had 10 big blinds and was forced to defend. The stats are noise.

After 500 hands? Different story. After 2,000 hands? That's legitimate data.

I designed HUDs to show sample size prominently because it's more important than the numbers themselves. Many modern HUDs hide it or bury it. Bad design.

Position-Dependent Stats

A player's 25 VPIP in early position is vastly different from their 25 VPIP from the button.

Good HUDs break stats by position. Button raise rate. Small blind frequency. Early position folding rates. A player might be a 25% player overall but a 35% button player and 15% UTG player. The overall stat is misleading.

Most free HUDs don't show this. You need upgraded software.

The Three Most Important Stats

If a HUD showed only three things, it would be: VPIP, AF (aggression factor), and wtsd (went to showdown).

WTSD is underrated. A player with 35 VPIP and 65% wtsd is a fish. They're seeing showdowns 65% of the time they enter a hand. A competent player goes to showdown 25-35% of the time. The difference is huge.

Aggression factor: total bets and raises divided by total calls. An AF of 0.5 means they call twice for every bet or raise. An AF of 3 means they bet three times for every call. Both can be profitable depending on the player.

Positional Adjustments

You see a 18 VPIP player. He looks like a nit. But he's in the button and has raised 60% of his hands from there. His 18 VPIP is dragged down by his 8% UTG raise rate.

From the button, he's a 45% raiser. He's not a nit. He's positionally aware.

This is why raw stats mislead.

The Design Truth

A HUD is architecture for decision-making. Every stat should reduce uncertainty about opponent strategy. Most HUDs fail at this. They show 15 stats that answer different questions, leaving you paralyzed.

The best approach: two metrics per spot. What's this player's range from here? What's their aggression level? Everything else is detail.

The eye should land on what matters. The rest is noise dressed as information.