💰 Bankroll management

What it is

Bankroll management is the practice of allocating your betting funds across individual wagers to control risk and extend your ability to bet over time. It doesn't improve your pick accuracy or turn a negative expectation into positive—it simply ensures that normal losing streaks don't wipe out your capital. The core idea is to stake a fraction of your current bankroll, so your bet size automatically shrinks after losses and grows after wins.

How it works

The calculator applies a percentage of your bankroll as the stake. For example, with a current bankroll of $1,000 and a stake of 2%, each bet is $1,000 × 0.02 = $20. After a loss, the bankroll becomes $980, and the next stake is $980 × 0.02 = $19.60. This gradual reduction protects your capital during downturns.

For a streak simulation, enter the number of wins and losses and the average odds. If you start with $1,000, stake 2%, and simulate 5 losses at odds of 2.00, the final bankroll after those losses is $1,000 × (1 - 0.02)^5 = $1,000 × 0.98^5 = $903.92. The profit/loss is therefore -$96.08. The calculator shows the same numbers using the exact formula.

The unit size concept ties your stake to a fixed percentage of the bankroll, but the unit itself is that percentage. For instance, if your unit size is 2% and you have 50 units available ($1,000 ÷ $20 = 50), each unit represents one bet at the standard stake. You can then scale your betting intensity by varying the number of units per bet.

How to use it

1. Enter your starting capital in the 'Current bankroll' field—use a realistic amount you're actually willing to risk.
2. Select a staking strategy from the options: 'Flat (fixed)', 'Proportional', 'Fibonacci', or 'Martingale (⚠️ risky)'—each changes how the stake is calculated.
3. Set your stake percentage in the 'Stake (% of bankroll)' field—common values range from 1% to 5% for proportional strategies.
4. Use the 'Simulate streak' section to test a sequence: enter the number of 'Wins' and 'Losses' and the 'Average odds' to see the impact on 'Final bankroll' and 'Profit/Loss'.
5. Read the 'Calculated stake' and 'Available units' outputs to understand your per-bet exposure and how many bets your current bankroll can sustain.
6. Repeat the simulation with different loss counts to see how far a losing streak can draw down your bankroll before you adjust.

How to read the result

• The 'Calculated stake' is the exact dollar amount you should wager on the next bet based on your chosen strategy and current bankroll. It is not a recommendation to bet more than you can afford to lose.
• 'Available units' tells you how many bets of the current unit size you can place before depleting your bankroll. If losses reduce your units, the stake per bet decreases automatically in proportional strategies.
• 'Final bankroll' and 'Profit/Loss' from the simulation are hypothetical results based on the exact streak you entered. They do not predict future outcomes but illustrate the mathematical impact of that specific sequence.

When not to trust the result

• These calculations assume each bet is placed at the same odds and that no withdrawals or deposits occur mid-streak. Real betting involves changing odds, multiple simultaneous bets, and cash flow decisions that alter the trajectory.
• No staking strategy can turn a negative expectation into a profitable one. If your picks lose money over the long run, any method of staking will only accelerate or delay the inevitable loss. The numbers here are neutral tools, not guarantees of gain.
• Long losing streaks are mathematically normal even with a high win rate. A 60% win rate still has a 1-in-100 chance of a 10-bet losing streak. Seeing a drawdown does not mean the system failed—it means variance exists.
• Proportional staking reduces your stake as you lose, which is psychologically difficult because you bet less when confidence might be high. It also limits upside: after a big win, you increase stake when the market may have become less efficient.
• The Martingale strategy doubles the stake after each loss to recover losses with one win. This is extremely risky because a long losing streak can quickly exceed your bankroll, and most betting limits will stop you before recovery.

Frequently asked questions

What bankroll percentage should I use?

Common recommendations are 1% to 5% per bet, depending on your win rate and risk tolerance. Lower percentages (1–2%) are safer for longer streaks. The calculator lets you test different values in the simulation.

Does the calculator guarantee I won't go broke?

No. Mathematical ruin is still possible if you bet large percentages or face a long enough losing streak. The calculator shows the impact of a given streak, but it cannot predict how many losses you'll actually encounter.

Why does the stake change after each bet in proportional staking?

Because the stake is a percentage of your current bankroll. As your bankroll changes, the same percentage yields a different dollar amount. This is by design to adjust exposure to your current capital.

Should I use flat or proportional staking?

Flat staking keeps the same dollar amount per bet, which can be easier to track but exposes you to larger relative risk as your bankroll shrinks. Proportional staking automatically reduces risk after losses but requires recalculating each bet.