Home / Betting systems simulator
Free tool · Updated October 2026Do betting systems work?
We tested five of them
Martingale, Fibonacci, D’Alembert and Paroli all promise to beat the casino. This simulator plays each one through thousands of roulette, blackjack or slot bets for hundreds of players, so you can see what really happens to the bankroll.
Running the numbers…
Bankroll over the session
Every system, same game, same luck
Each system faces the identical run of results. Tap a row to chart it.
| System | Ahead at the end | Went bust | Average finish | Average wagered | House kept per 100 bet |
|---|
How it works
What the simulator shows
Why no betting system beats the house edge
The casino’s average take is the house edge multiplied by everything you bet. A system can change how often you win and how big your losses are when they come, but it can’t change that sum.
The edge is fixed
Each spin of European roulette has a 2.70% house edge. No pattern of earlier results makes the next spin more likely to land on red.
Progressions move risk
Martingale and Fibonacci swap frequent small wins for rare, very large losses. The average outcome stays the same.
Table limits bite
Doubling from a £5 stake passes £500 after eight losses in a row. That streak turns up far more often than most players expect over thousands of spins.
More betting, more loss
Systems that raise stakes after losses make you bet more in total. Bigger turnover means a bigger expected loss.
Anyone selling a “winning system” is selling a story. If a staking plan could beat roulette, casinos would ban it. They don’t, because every one of them loses at the same rate as flat betting in the long run. Treat gambling as paid entertainment and set a limit before you play. Tools to stay in control →
FAQ
Betting system questions
Do betting systems like Martingale work?
No. A betting system changes how much you stake and when, but not the odds of any single bet. Every bet still carries the house edge, so the more you wager in total, the more you lose on average. Martingale wins small amounts often and then loses heavily when a losing streak hits the table limit or empties the bankroll.
What is the house edge on roulette?
2.70% on European roulette, with one zero, and 5.26% on American roulette, which adds a double zero. On average the casino keeps that share of every bet on red or black.
Can you win with a betting system in the short term?
Yes. Plenty of simulated players finish a short session ahead. Over a long session the share of players in profit shrinks, and the average result moves towards the house edge whatever system they use.
Is there any legal way to beat the casino?
Not with a betting system. The only proven edges are card counting in live, shoe-dealt blackjack, which casinos counter, and occasionally a bonus whose value exceeds its wagering cost. Use the casino bonus calculator to check an offer.