Variance
Variance is the short-term swing between your actual poker results and your expected results, caused by the luck of the cards.
Variance describes how far your actual results can stray from your expected results in the short run. Every poker decision has an expected value, but the cards decide what happens in any one hand. Variance is why a great player can lose for weeks and a weak player can win a big pot. Over a large enough number of hands, results move toward expectation; in the short run, almost anything can happen.
A worked example of variance
You hold A♠ A♥ and get all-in before the flop against K♣ K♦. Aces win roughly 4 times out of 5. Suppose each player puts in 100 big blinds, making a 200 pot. Your expected value is about 0.82 × 200 − 100 = +64 big blinds each time this happens.
But you never actually win 64. You either win 100 or lose 100. Around one time in five or six, the kings come through. The chance of losing this exact all-in twice in a row is about 0.18 × 0.18 ≈ 3%, which is uncommon but will happen to every regular player eventually.
Even for a true coin flip, such as 7♣ 7♦ against A♠ K♥ preflop, the chance of losing five in a row is (1/2) multiplied by itself five times = 1/32, or about 3.1%.
Why variance feels so strong in poker
- Big pots decide results. A handful of all-ins can outweigh hundreds of small hands.
- Edges are small. A solid player's advantage per hand is tiny compared with the size of the pots, so luck dominates any short sample.
- Some styles swing more. Aggressive play, deep stacks, short-handed tables and tournaments all increase the size of the swings.
Managing variance
| Approach | What it does |
|---|---|
| Bankroll management | Keeps enough buy-ins so normal swings never wipe you out. |
| Judge decisions, not outcomes | Review whether your play was right given the information, not whether you won. |
| Track large samples | Measure win rate (for example in bb/100) over many hands, not single sessions. |
| Recognize tilt | Stop or take a break when losses start changing how you play. |
Common misconceptions
- "I'm due to win." Cards have no memory. Losing several flips in a row does not make the next one more likely to win.
- "My results prove my strategy works." A short winning streak can hide mistakes just as a losing streak can hide good play.
- "Variance is only bad luck." It cuts both ways. Upswings are variance too, and they can make players overestimate their skill.
It also helps to know that variance does not go away with skill. Better players still lose sessions, weeks and sometimes longer stretches; their edge simply shows up more clearly over a larger number of hands.
Accepting variance is a big part of improving. When you focus on making +EV decisions and reviewing them honestly, the swings become something to manage rather than something to fear.
Frequently asked questions
What is variance in poker?
Variance is the difference between your actual short-term results and the results your decisions would earn on average. It comes from the luck of the cards.
How do you deal with variance in poker?
Use sound bankroll management, judge your decisions rather than results, and measure your win rate over large samples of hands.
Can a good player lose over a long stretch?
Yes. Because poker edges are small compared with pot sizes, even strong players can have long losing stretches due to variance.
Related poker terms
- Expected Value (EV) — Expected value (EV) is the average amount a poker decision wins or loses if repeated many times. Good players choose the option with the highest EV.
- Bankroll Management — Bankroll management means keeping money set aside only for poker and choosing stakes small enough that normal swings cannot wipe you out.
- Tilt — Tilt is a state of frustration or emotion that makes a poker player abandon good decisions, usually after bad beats or a losing run.
- BB/100 (Big Blinds per 100 Hands) — BB/100 is a poker win rate: the number of big blinds a player wins or loses on average per 100 hands, letting results compare across stake levels.
- Equity — Equity is your share of the pot based on how often your hand would win if all remaining cards were dealt, expressed as a percentage.