Use this calculator to model a Martingale betting sequence, estimate required bankroll, and understand how quickly risk compounds after consecutive losses.
What Is a Martingale Strategy?
The Martingale is a progression betting strategy where you increase your stake after each loss, usually by doubling. The idea is simple: eventually a win recovers previous losses and produces a small net gain. In theory this sounds attractive. In practice, it creates a sharp risk curve because bet sizes grow exponentially.
How to Read This Calculator
Inputs
- Base Bet: your starting stake.
- Loss Multiplier: how much you increase after each loss.
- Payout Odds: net profit for each $1 risked on a win.
- Planned Maximum Consecutive Losses: how deep a losing streak you want to survive.
- Bankroll: money available to fund the sequence.
- Win Probability: used to estimate losing-streak probability and expected value.
Outputs
The tool shows the full bet sequence, the total bankroll required to survive the planned streak, and whether your bankroll can support it. If win probability is provided, it also estimates:
- Probability of hitting the full loss streak,
- Cycle success probability,
- Expected value (EV) of one complete cycle.
Why Martingale Risk Grows So Fast
With a classic 2x multiplier, bets go 10, 20, 40, 80, 160, 320... The total amount at risk after six losses is not 320, but 630. That’s the core issue: each additional step adds a larger absolute amount than all early rounds combined.
This is why table limits and finite bankroll matter. The strategy depends on being able to keep increasing stakes. Real-world constraints eventually block that path.
Expected Value and the House Edge
A progression system changes distribution of outcomes, not the underlying edge. If each individual bet has negative expectation, combining them in a sequence generally remains negative expectation. You may experience many small wins and occasional large losses; psychologically this can feel like progress even when long-run math says otherwise.
Practical Risk Management Takeaways
- Use fixed stop-loss and stop-time limits before you begin.
- Never treat bankroll requirement as a guarantee of safety.
- Understand that “rare streaks” become likely across many sessions.
- If this is for investing/trading, remember markets are not independent coin flips.
Bottom Line
The Martingale strategy can look stable in short samples but carries tail risk that grows rapidly with each loss. This calculator is meant to make those trade-offs visible before money is at stake. Use it to test assumptions, compare multipliers, and pressure-test bankroll plans with realistic probabilities.