What a casino bankroll is
Your casino bankroll is money set aside for casino play that you can lose without affecting anything else. Not next week's rent. Not tomorrow's grocery money. Not any part of an emergency fund. If a total loss of the roll would change a single fixed cost in your life, the roll is too big for you at this point.
Session bankroll versus total bankroll
Split the total roll into session bankrolls of no more than five per cent each. If your total roll is 1,000 EUR, no single session takes more than 50 EUR out of it. This is the single most important discipline in bankroll management, because it caps the damage of one bad night without capping the number of good nights you get.
Choosing a stake by variance
The higher the game variance, the smaller your stake needs to be as a fraction of the session bankroll, or the sessions vanish in five minutes. Approximate rules:
| Game variance | Stake as fraction of session bankroll | Example (50 EUR session) |
|---|---|---|
| Low variance slots, blackjack | 1% to 2% | 50 cents to 1 EUR per hand or spin |
| Medium variance slots, roulette | 0.5% to 1% | 25 to 50 cents per spin |
| High variance slots, high multiplier games | 0.2% to 0.5% | 10 to 25 cents per spin |
| Live game shows | 0.5% to 1% | 25 to 50 cents per round |
Stop-loss and win-goal rules that work
A stop-loss is a hard cap on session losses. Set it at 100 per cent of the session bankroll and honour it. When the session bankroll is spent, the session ends. No add-ons, no "just one more deposit". A win-goal is a target where you leave. A common rule is to bank the initial stake at 100 per cent up and play the rest with the same discipline.
Two spreadsheets that make everything obvious
The first spreadsheet is a session log. One row per session with the date, deposit, withdrawal, net, game, and a comment. After thirty rows the pattern is impossible to miss; you know where the wins really come from and where the losses hide.
The second is a bankroll balance sheet. One row per week with the opening balance, deposits in, withdrawals out and closing balance. The point of this one is to make sure the total roll is trending in a way you can accept. If it is not, the roll is too big, the games are too expensive, or both.
Behaviour that saves and behaviour that sinks
Chasing losses is the fastest way to lose a bankroll. Doubling stakes to recover is the second fastest. Playing tired is the third. The three saves that beat them all are: pick a stake before the session and do not change it, decide the stop before you deposit, and treat time-outs and deposit limits as normal tools, not signals of weakness.
Advanced concepts: Kelly, variance and risk of ruin
Once the basics are in place, the mathematics gets interesting. Casino bankroll management borrows several ideas from investment sizing, most usefully the Kelly criterion, which tells you the optimal fraction of your bankroll to stake in a positive-expectancy game. Nearly all casino games are negative expectancy, so full Kelly is technically negative, meaning: do not play. Where the framework earns its keep is in advantage-play settings, or in bonus-abuse rounds where the expected value is briefly positive.
The related concept, risk of ruin, is the probability that you go bust in a session given your starting bankroll, per-hand stake and the game's house edge and variance. Simple simulators can estimate the number for any table game. As a rule of thumb: with a 100-unit bankroll at even-money blackjack played at basic strategy, risk of ruin over a 300-hand session is around 20%. Halve the stake and it drops below 5%.
| Game | Approx. house edge | Session variance | Bankroll units recommended |
|---|---|---|---|
| Blackjack (basic strategy) | 0.4-0.5% | Medium | 50-100 base bets |
| European roulette (even money) | 2.7% | Medium | 80-120 base bets |
| Baccarat (banker) | 1.06% | Low | 60-100 base bets |
| Low-variance slot (RTP 96%+) | 4% | Low-medium | 200-300 base bets |
| High-variance jackpot slot | 5-8% | Very high | 500+ base bets |
Bonuses, cashback and how they fit the bankroll picture
A bonus is a bankroll injection with strings attached. The wagering multiplier tells you how much notional turnover you have to run through the game before the bonus (and often the deposit tied to it) is unlocked. Treat the deposit-plus-bonus balance as one number for stake sizing, not two, and remember that the max-bet-while-active clause at many operators caps your per-spin stake at EUR 3 to EUR 5 during the wagering period.
Cashback offers, by contrast, function as a partial hedge on losses and can be modelled as an effective reduction in house edge over a session. A 10% cashback on losses turns a 4% RTP slot into an effective 96.4% RTP for the purposes of long-run bankroll modelling, so long as the cashback is paid without further wagering conditions.
The five bankroll mistakes we see every week
Reader emails to Keira break the same five errors most often. Recognising the pattern usually shifts behaviour without a spreadsheet.
- Chasing losses. The most damaging pattern is stake escalation after a losing session, hoping to recover. Predefined stop-loss rules are the only reliable defence.
- Playing without a session bankroll. Funding a session directly from the deposit balance means never noticing when the number moves. Always define a session bucket.
- Ignoring the max-bet clause. Big win voided on a technicality is the single most common complaint we see. Read the T&Cs on stake caps before the first spin.
- Playing on tilt. After a bad session, take a full 24-hour break before returning. Every reputable operator provides tools to enforce this if you want the friction.
- Withdrawing progressively. Small, frequent withdrawals from a winning session let you lock in the win before it drifts back. The habit is worth learning.
Closing thoughts: bankroll is a habit, not a spreadsheet
The spreadsheet is the easy part. The discipline to close the tab when the session bankroll hits zero, to withdraw partial winnings before playing them back, to refuse to chase — those are the harder skills, and they are what separate a recreational player who leaves with what they came in with from one who does not. Every framework in this guide is downstream of the habit. Build the habits first.
One further thought: revisit your bankroll rules quarterly. Life circumstances change, and a bankroll rule set when you had one income might need adjusting when it changes. Treating the rules as living rather than fixed keeps them honest.
Reviewing your bankroll rules after every 10 sessions
A rule that never changes is a rule that has stopped tracking reality. Every ten sessions or so, sit down for ten minutes and answer three questions: did the session bankroll size feel right, did the stop-loss trigger at the right time, and did the win-goal capture the right amount of upside? Adjust one variable if any of the three answers is a firm no, and never adjust more than one at a time. Isolated adjustments make it possible to tell whether the change worked.
Over a longer horizon, six months of session logs will reveal your actual house-edge experience versus theoretical. If you consistently underperform the theoretical edge by more than one or two percent, either your stake sizing is unstable, you are playing games with worse RTP than you think, or your session logs are undercounting losses. All three are worth investigating.
FAQ
How big should my casino bankroll be?
Whatever amount you would spend on entertainment for the equivalent number of hours and not miss. If the loss of it would change a fixed cost in your life, the roll is too big.
What is a good stop-loss for a session?
100 per cent of the session bankroll, which itself is typically 2 to 5 per cent of your total roll. When the session amount is gone, the session is over.
Do bankroll rules apply to bonus play?
Yes, and doubly so. A bonus adds variance because you cannot cash out mid-wagering. Size your stake conservatively and set the same stop as if the money were your own, because for practical purposes it is.