How much bankroll do you need for blackjack (and what is the risk of ruin)?
Short Answer
Bankroll needs depend on bet size, table rules, and variance. Even with perfect basic strategy, bankroll swings can be large. Risk of ruin increases sharply when bets are too large relative to bankroll. Simulations provide the most realistic estimate for your specific setup.
By The Numbers
| Bankroll : Bet Size | Typical Risk Profile (Illustrative) |
|---|---|
| 50:1 | High volatility, higher ruin risk |
| 100:1 | Moderate volatility, lower ruin risk |
| 200:1 | Lower volatility, more resilient |
Detailed Explanation
Bankroll requirements are determined by the relationship between bet size, expected value, and variance. Even with a positive expected value, insufficient bankroll relative to bet size creates high probability of ruin before the statistical edge can materialize.
A common guideline suggests a bankroll of at least 100–200 times the base bet for recreational play with basic strategy. However, this does not guarantee survival through variance. Larger ratios provide more resilience against losing streaks.
Table rules affect both expected value and variance. Games with 6:5 payouts or unfavorable dealer rules increase the house edge, requiring even larger bankrolls to sustain the same number of hands. Poor rules accelerate bankroll depletion.
Risk of ruin is the probability that your bankroll will be completely depleted before reaching a target profit or number of hands. With negative expected value (standard play), risk of ruin approaches 100% given enough time. With positive expected value (skilled counting), it remains significant unless bankroll sizing is conservative.
The simulator allows you to input your specific bankroll, bet size, and table rules to estimate probability of ruin, maximum drawdown, and expected bankroll evolution over your desired session length.
Limitations & Context
- •These are illustrative ranges, not guarantees.
- •Results vary widely due to variance and rules.
- •Gambling involves financial risk; avoid betting beyond what you can afford to lose.
- •Simulations assume perfect strategy execution and do not account for emotional decision-making or fatigue.