Roulette Betting System Simulator
Simulate popular betting systems and see their real performance
Formula:
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Additional Bankroll Analysis
Monte Carlo simulation with 1,000 iterations
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Quick Answer
The truth about betting systems
No betting system can overcome the house edge. Martingale doubles bets after losses - it wins small often but risks catastrophic loss. With a $10 base bet, after 7 losses you're betting $1,280 to win $10. The house edge applies to every bet regardless of system. Simulations show all systems converge to expected loss over time.
Key Facts About Betting Systems
What the math tells us
- All betting systems have the same expected value: negative
- Martingale: High win rate but catastrophic when losing streak hits
- Fibonacci: Slower progression but still vulnerable to table limits
- D'Alembert: Lower variance but slower to recover losses
- Paroli: Positive progression - caps wins, limits losses
- The house edge cannot be overcome by any bet sequencing
- Short-term results vary wildly; long-term results approach expectation
Frequently Asked Questions
Common questions about betting systems
Why do betting systems seem to work?
Systems like Martingale win most sessions because small wins are common. But the math catches up: rare catastrophic losses wipe out many small wins. Over thousands of sessions, total losses equal (house edge × total wagered). No system changes this.
What is the Martingale system?
Martingale doubles your bet after each loss. Starting at $10: if you lose 3 times then win, you bet $10, $20, $40, $80 and win $80. You've bet $150 total to win $10 net. A 10-loss streak (not rare) would require $10,240 on a single bet.
Which betting system is best?
None is "best" because all have identical long-term expectation. Flat betting is simplest and has lowest variance. If you insist on a system, Paroli (positive progression) limits losses while still allowing some upside. But mathematically, all lose at the same rate.
Can simulations prove systems work?
Simulations actually prove systems DON'T work. Run 100,000 sessions with any system and total profit/loss will approach (house edge × total wagered). Short simulations might show profit, but that's variance - like flipping heads 7 times in 10 flips.
How this works
Calculations follow the published mathematics of the game — combinatorics for cards, probability theory for dice, and expected-value accounting for wagers. Results are verified against independent references (primarily Wizard of Odds). No calculation here is an opinion or recommendation; it is arithmetic applied to the rules of the game.
What this tool can’t do
When to consult a professional
This tool computes probability and expected value. It is not a betting system and cannot predict the outcome of any individual wager. If gambling is causing problems for you or someone you know, call the National Problem Gambling Helpline at 1-800-GAMBLER.
Sources
- [1]Wizard of Odds — Michael Shackleford, ASAIndustrywizardofodds.comAccessed Apr 21, 2026
Actuary; widely cited casino-game probability reference. Used for house-edge and EV verification.
- [2]National Council on Problem GamblingOfficial sourcencpgambling.orgAccessed Apr 21, 2026
Responsible-gambling guidance and 1-800-GAMBLER helpline.
Joseph OrdunaFounder & Software Engineer
Full-stack software engineer specializing in embedded systems, web architecture, and AI/ML. Founder of Practical Web Tools. Built the gesture-controlled drone IP acquired by KD Interactive (Aura Drone, sold on Amazon).