Poker Bankroll Management: How Many Buy-Ins You Need

Thirty buy-ins for online cash games, one hundred or more for tournaments. Those numbers are not caution for its own sake — they are the amount of money required for a genuine edge to survive a normal run of bad luck. A solid winner at NL50 can sit 20 buy-ins below expectation after a perfectly ordinary six months, and a ten buy-in roll simply does not live through that.

The numbers that actually work

Bankroll guidelines are the output of one question: how much money do you need in front of you so that a normal bad stretch does not end your poker career? Here is where the standard answers land.

Format	Cautious	Standard	Aggressive
6-max online cash	50 buy-ins	30 buy-ins	20 buy-ins
Full-ring online cash	40	25	15
Heads-up cash	75	50	30
Live cash	30	20	12
Sit & gos	100	75	50
MTTs, small field	150	100	60
MTTs, large field	300	200	100

A buy-in means 100 big blinds, so 30 buy-ins at NL50 is $1,500 and 3,000 big blinds. Counting in big blinds rather than dollars is the more useful habit, because it makes the requirement portable across currencies and stakes and stops you anchoring on a dollar figure that felt large when you first reached it.

Two things about that table.

The right-hand column is not free. Twenty buy-ins in a 6-max cash game carries a real chance of losing everything, even with a solid win rate. It is a defensible choice only if poker money is replaceable from elsewhere.

The left-hand column is not paranoid. Players with no income outside poker sit there on purpose, because for them going broke is not an inconvenience, it is unemployment. The correct number depends less on your skill than on what happens to your life if the money disappears.

Why the number is 30 and not 10

Poker results are a random walk with a slight upward tilt. The tilt is your win rate; the randomness is enormous next to it.

In online 6-max cash, standard deviation runs around 90bb/100 hands. A very good win rate is 5bb/100. So the noise in any given 100 hands is roughly eighteen times the size of your edge, and that ratio is what dictates the bankroll. Over 10,000 hands the edge has grown to 500bb while the noise has only grown to about 900bb — the signal is catching up, but slowly.

The mathematics behind that gap is covered in detail in how poker variance works, and the practical consequence is blunt: swings of 20 buy-ins are normal, not a sign that anything has gone wrong.

Bankroll requirement scales with the square of your standard deviation and inversely with your win rate. Halve your edge and you need roughly twice the money.

That relationship explains why the answer is not one number. A 6bb/100 crusher and a 1bb/100 breakeven-plus grinder face the same variance and wildly different requirements — the grinder needs about six times the roll for the same safety.

Cash games: sizing it to your win rate

Thirty buy-ins is a default, not an answer. To get your own number you need two inputs, and most players guess both badly.

Your win rate. Not your win rate over your best 20,000 hands. Over your whole sample, with rakeback separated out, and with a confidence interval attached — 100,000 hands is where the estimate starts to mean anything. Working out your true win rate usually deflates the number people quote, and a deflated win rate means a larger bankroll.

Your standard deviation. Your tracking software reports it. Loose-aggressive styles, straddled games and heads-up all push it well above 90bb/100; nitty full-ring play sits below.

Feed both into a risk of ruin simulator and you get the honest answer rather than the folklore one. A 3bb/100 winner with 100bb/100 standard deviation wanting a sub-5% chance of ruin lands well north of 30 buy-ins. A 7bb/100 winner in a soft live game lands well below.

The simulator is also the fastest cure for panic. Seeing that a 15 buy-in downswing appears in a large share of simulated years turns a crisis into a scheduled event. For what those stretches feel like and how long they typically run, see how long downswings last.

Tournaments: why 100 is the floor

Tournament bankroll requirements are not a stricter version of the cash rule. They are a different order of magnitude, because the payout structure concentrates almost all the money in the top few finishes.

You cash in perhaps 15% of the fields you enter, and the cashes that matter are the rare deep runs. That produces long stretches of nothing punctuated by occasional large scores — mathematically the same shape as a lottery with a positive edge.

The consequences are practical:

• Field size drives everything. A 180-runner field is survivable on 100 buy-ins. A 5,000-runner Sunday major is not; size for 200 or more.
• Your average buy-in is the unit, not your largest. If you play mostly $22s and one $215 a month, that $215 is a shot, and it needs its own justification.
• Satellites and rebuys distort the count. Budget a rebuy tournament at its realistic total cost, not the printed entry fee.
• Downswings are measured in months. Two hundred tournaments without a final table is unremarkable, and at four events a night that is most of a season.

Most tournament players who go broke were not unlucky. They were rolled for the variance of a game with a much flatter payout curve than the one they were sitting in.

What multiplies your requirement

Two players at the same stake with the same win rate can need very different bankrolls. These are the factors that move the number, in rough order of how much damage they do.

• Table count. Four tables at once produce a lower standard deviation per 100 hands than one table, but far more hands per hour, so the swings arrive faster in wall-clock time. Budget by month, not by hand.
• Playing style. Three-betting light, barrelling turns and defending the big blind wide all raise variance for the same expectation. A high-aggression winner needs more cushion than a nit with the identical win rate.
• Rake. At micro stakes the rake is a bigger share of the pot, which flattens your edge without touching the variance — and a flatter edge means a bigger roll.
• Game selection. A soft table raises your win rate and lowers your requirement at the same time. It is the only lever that pulls in both directions at once.
• Stability outside poker. A steady salary behind you means a downswing is a bad month rather than an existential problem, and that genuinely justifies a thinner roll.

Moving up, moving down, and taking shots

Bankroll rules matter most at the moments you least want to follow them.

The move-down trigger is the one that saves careers. If your rule is 30 buy-ins to play a stake, set the drop at 20 and honour it without debate. Deciding mid-downswing is hopeless — that is exactly when the games look softest and the urge to win it back is loudest.

Moving up deserves the same discipline in reverse. Arrive with the full roll for the new level plus enough cushion to lose several buy-ins without immediately retreating, because bouncing between stakes costs more in mental energy than it does in money. The specific mechanics of moving up a stake level matter here: the win rate you carry upwards is always lower than the one you left behind, which means the buy-in requirement rises twice — once because buy-ins are bigger, and again because your edge is smaller.

Shot-taking is fine when it is bounded. Decide beforehand how many buy-ins you will lose at the higher stake before dropping back, and treat that figure as spent money the moment you sit down.

The rules that keep a bankroll intact

Four habits do most of the work, and none of them involve playing better.

1. Keep poker money separate. A bankroll you dip into for rent is not a bankroll, it is a float. Track it as a distinct balance.
2. Withdraw on a schedule, not on a whim. Take a fixed share of profit monthly. Withdrawing after a big win and topping up after a loss is how rolls quietly shrink.
3. Recount after every level change. Buy-in requirements move with stakes, so the number you memorised at NL25 is wrong at NL100.
4. Treat tilt as a bankroll expense. Session and loss limits protect the roll more reliably than any buy-in multiple, because the worst days are self-inflicted rather than dealt.

Bankroll management adds nothing to your expectation per hand. What it buys is time — enough hands for a real edge to separate itself from the noise, which is the only way anyone has ever won at this game.