Martingale Roulette Strategy
Martingale is the most famous roulette strategy in the world and the most misunderstood. The idea is simple: double after every loss, reset after every win. The math is also simple: one long losing streak ends the strategy permanently.
Run it yourself in the tester. Use $10 base, $1,000 bankroll, 200 spins, ten times in a row. You will see exactly how it behaves.
How Martingale works
Pick an even-money target (red, black, odd, even, low or high). Start at a base bet, for example $10.
- Win: collect $10 profit. Next bet stays at $10.
- Lose: next bet doubles to $20.
- Lose again: next bet doubles to $40.
- Lose three more times: bets go $80, $160, $320.
- Whenever you win, you net $10 (the base bet) regardless of how many losses preceded it.
Example bet progression
| Loss # | This bet | Total wagered so far | Bankroll left ($1,000 start) |
|---|---|---|---|
| 1 | $10 | $10 | $990 |
| 2 | $20 | $30 | $970 |
| 3 | $40 | $70 | $930 |
| 4 | $80 | $150 | $850 |
| 5 | $160 | $310 | $690 |
| 6 | $320 | $630 | $370 |
| 7 | $640 (cannot place) | - | - |
Bankroll requirements
The bankroll needed to survive n consecutive losses with base bet b is b × (2n+1 − 1).
| Losses absorbed | Required bankroll at $10 base | Probability of N losses (European) |
|---|---|---|
| 5 | $310 | 3.58% |
| 7 | $1,270 | 0.94% |
| 8 | $2,550 | 0.49% |
| 10 | $10,230 | 0.13% |
| 12 | $40,950 | 0.034% |
The probability of seeing some 10-loss streak somewhere in a 200-spin session is much higher than 0.13%. Use the tester to confirm - you will hit a 7-8 loss streak roughly once every couple of sessions.
Table limit risk
Even if your bankroll is unlimited, casino table limits are not. A typical $10-min table caps even-money bets at $5,000. After 9 doublings ($10 to $5,120) you cannot place the next bet. Martingale dies at the limit regardless of how much cash is left.
European vs American
European loss probability on a 1:1 bet: 19/37 = 51.35%. American: 20/38 = 52.63%. The American number means longer expected losing streaks and a higher bust rate for Martingale. Run both in the tester - the difference is visible after 500 spins.
Real test results
Across 1,000 simulated sessions of $10 Martingale on $1,000 bankroll for 200 spins each on European:
- ~75% of sessions end with a small profit (typically +$50 to +$300).
- ~20% end near break-even or with a small loss.
- ~5% bust completely - one long losing streak.
- Average final bankroll is slightly negative, consistent with the house edge.
The 5% bust rate is what most short tests hide. If you ran Martingale once at home for a single evening, you would likely walk away thinking it works.
Why short tests are misleading
Martingale wins most sessions. That is the trap. A session with no 10-loss streak looks like proof. A session with one 10-loss streak looks like proof of the opposite.
The only honest read is the distribution across many sessions. Run it 20 times. Note the average and the worst case. The math will land where it always lands - on the side of the house.