Bankroll management 101

A bankroll is the money you have set aside for betting and nothing else. Not rent, not savings, not the card you use for groceries. The number has to be one you could lose in full without it changing anything about your life. Everything in this guide follows from that definition, so if the number is not settled, settle it first.

Bankroll management is the set of rules that decide how much of that money goes on any one bet. Its purpose is not to make you win. It is to make sure that a run of losses, which every bettor has, does not end your ability to bet at all.

Why variance is the problem

Even a bettor with a genuine edge loses often. At typical sportsbook prices, winning 55% of your bets is a good long-term result. It also means losing 45% of them, and losses cluster. Ten straight losses at a 55% win rate is unlikely on any given run but close to certain over a few thousand bets.

If each of those ten bets was 10% of your bankroll, you are out of money before the edge has had time to show. If each was 1%, you are down 10% and still playing. The edge is the same in both cases. The stake size is what decides whether you survive long enough to collect on it.

Think in units

The standard tool is the unit: a fixed fraction of your bankroll that becomes the base size for every bet. One percent is the common starting point for someone who is not sure of their edge. Two percent is aggressive. Five percent is for people who have decided the bankroll is entertainment money and have priced in losing it.

Units do two things. They keep stakes proportional to what you can afford, and they make your results readable. A record of +12 units over a season means something. A record of +$840 means nothing until you know what the stakes were.

Flat staking

The simplest system is to bet one unit on everything. No adjustment for confidence, no adjustment for price. It is also the hardest system to beat for most bettors, because it removes the single biggest leak in recreational betting: staking more on the bets you feel strongest about, which are not reliably the bets you are most right about.

Scaled staking

Some bettors use a small range, say one to three units, and assign the higher stakes to bets where they have a specific reason to believe the edge is larger. This can work, but only if the reasons are written down in advance and checked afterwards. If your three-unit bets do not outperform your one-unit bets over a few hundred of each, the scaling is costing you money and flat staking is the answer.

Percentage staking

A unit can be fixed in money terms or recalculated as a percentage of the current bankroll. Recalculating means stakes shrink during a losing run and grow during a winning one, which is a built-in brake. The cost is that it takes longer to recover from a drawdown, because you are betting less while you climb back. Either approach is defensible. Switching between them mid-season is not.

What to do with the Kelly criterion

The Kelly formula gives the stake that maximises long-term bankroll growth given a known edge and known odds. For a bet at even money that you believe wins 55% of the time, the full Kelly stake is 10% of your bankroll. That number is correct and almost nobody should use it.

The problem is the word known. Your estimate of your edge is wrong by some amount, and Kelly punishes overestimates severely: betting twice the true Kelly fraction gives zero long-term growth, and anything above that loses money even with a real edge. Bettors who use Kelly at all usually use a quarter or a half of the computed stake. For most people the honest conclusion is that a flat one or two percent is close enough to fractional Kelly and far easier to stick to.

Rules that survive contact with a bad week

• Decide the bankroll and the unit size before the season starts, and write both down.
• Never chase. A loss does not change the probability of the next bet. The only thing it should change is your bankroll figure, if you are recalculating.
• Keep betting money in a separate account or wallet. Topping up from elsewhere is the moment a bankroll stops being a bankroll.
• Review at fixed intervals, monthly or quarterly, not after a bad night. Resize the unit then, if the bankroll has moved enough to warrant it.
• Track every bet: date, market, price, stake, result. If you are not willing to keep the record, you are not in a position to know whether any of this is working.

When the rules stop being about money

Bankroll management assumes you can stop. If you find you are betting money that was never part of the bankroll, hiding stakes, or betting to recover a loss rather than because you want the position, the problem is no longer staking. Our responsible gambling page lists the deposit limits, time-outs and self-exclusion tools that regulated operators provide, and the organisations that will talk it through for free. Use them early. They work better before a bankroll is gone than after.