The Martingale strategy is roulette's best-known betting system: you double your bet after every loss on an even-money bet like red/black, so your first win recovers every previous loss in that streak plus a profit equal to your original stake. It's simple, it's popular with new players, and - despite how convincing it feels - it never changes roulette's underlying house edge. Here's exactly how it works, what a real losing streak actually costs, and why it can go wrong fast.
Published July 30, 2026
The Martingale strategy is a betting system used in roulette (and other even-money games like blackjack or baccarat) where you double your bet after every loss and drop back to your original bet size after every win. The idea is that your first win in any losing streak recovers all of the losses in that streak, plus a profit equal to your very first bet.
It's named after an 18th-century Parisian gambling house (some accounts point instead to the French town of Martigues), and it's almost certainly the oldest, most widely known betting system in casino gambling - most new roulette players land on some version of it before they've even heard the word "Martingale."
The mechanics are genuinely simple, which is a big part of the appeal:
| Spin | Bet Size | Total Wagered So Far | Result |
|---|---|---|---|
| 1 | $5 | $5 | Lose |
| 2 | $10 | $15 | Lose |
| 3 | $20 | $35 | Lose |
| 4 | $40 | $75 | Lose |
| 5 | $80 | $155 | Lose |
| 6 | $160 | $315 | Lose |
| 7 | $320 | $635 | Lose |
| 8 | $640 | $1,275 | Win |
Worked example starting from a $5 base bet on an even-money outside bet (e.g. red/black), doubling after every loss.
Here's the part the doubling pattern obscures: every spin of a roulette wheel is completely independent of the last one. The wheel has no memory. Whether you just lost five times in a row or won five times in a row, the odds of red coming up on the next spin are exactly the same - about 48.6% on a European wheel, because the green zero pocket still isn't red or black.
Changing how big your bet is doesn't change that probability at all. The Martingale strategy only changes the size and timing of your bets - it doesn't touch roulette's house edge (2.7% on a European wheel, 5.26% on an American one), which comes purely from the zero (and double zero) pockets not paying out on even-money bets. Over a long enough run of spins, the maths guarantees the same expected loss regardless of how cleverly you size your bets around it.
The table above shows the real danger: the bet size grows exponentially, not steadily. Starting from a $5 base bet, seven losses in a row means an eighth bet of $640, having already risked $635 to get there. Ten losses in a row means an eleventh bet of $5,120.
Seven losses in a row on an even-money bet happens roughly 1 in every 106 sequences on a European wheel (more often on an American wheel, thanks to the extra zero) - unlikely on any single sequence, but far from impossible if you play regularly. And most casinos cap table maximums specifically to stop Martingale-style progressions in their tracks: once your required bet exceeds the table limit, you can't double anymore, and you're left eating the full loss with no way to recover it through the system.
That's the real failure mode of Martingale: not one bad spin, but a realistic losing streak meeting a table limit or a bankroll that runs out one bet too soon.
Honestly - no. No betting system, Martingale or otherwise, changes roulette's underlying house edge, because that edge comes from the payout structure and the zero pockets, not from how you size your bets. Fibonacci, D'Alembert, and the Reverse Martingale all just reshuffle when and how much you win or lose - none of them touch the odds of the next spin.
The only things that genuinely shift the maths in your favour are choosing a European wheel over an American one (2.7% house edge instead of 5.26%) and playing French roulette variants with rules like la partage or en prison, which return half your stake (or hold it for the next spin) on losing even-money bets when zero hits. See our Best Online Roulette guide for more on wheel types, odds, and where to play.
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The Martingale strategy is a betting system where you double your bet after every loss on an even-money bet (like red/black in roulette) and return to your original bet size after every win, so a single win recovers all previous losses in the streak plus a small profit.
You place a base bet on an even-money outcome like red/black or odd/even. If you lose, you double the bet and try again on the same type of bet. If you win, you pocket the payout and reset to your base bet. Because each win recovers everything lost in that streak, a single win always nets a profit equal to your original bet.
It doesn't beat roulette's house edge. Doubling your bet after a loss changes how much variance you take on, but every spin is independent, so it never changes the actual odds of winning the next one. Long losing streaks combined with table limits or a limited bankroll are what eventually catch up with the strategy.
There isn't a betting strategy that beats roulette's house edge - Martingale, Fibonacci, and every other system only change your bet sizing, not the odds. The only genuine edge you can gain is choosing a European wheel over an American one, and using rules like la partage when they're offered, since those directly lower the house edge rather than just reshuffling risk.
Yes. Because bet sizes double after every loss, a realistic losing streak of 7-10 spins can require a bet many times larger than your starting stake - often larger than a table's maximum bet, or larger than your remaining bankroll. That combination of exponential bet growth and a capped table limit is the strategy's main risk, not any single spin.
Once your next required bet is larger than the casino's table maximum, you can no longer double, so you're stuck with the full loss from that losing streak with no way to recover it by continuing the progression. This is exactly why table limits exist, and it's the most common way Martingale sequences actually fail in practice.
No betting system removes the risk of losing money, including the Martingale Strategy. Set a session budget you're comfortable losing before you start, and see our Responsible Gambling page for deposit limits and self-exclusion tools.