The Martingale System: Does Doubling Down Work?

The Martingale is the simplest betting system: double your bet after every loss, and return to your base bet after a win. When you eventually win, you recover all previous losses plus a one-unit profit. It is most commonly used on even-money bets in roulette.

On paper, the Martingale seems foolproof—a win is inevitable given infinite bankroll and no table limits. In reality, losses compound exponentially: after 7 consecutive losses at $10, your next bet would be $1,280, risking $2,550 total to win just $10.

The system fails because of table limits and finite bankrolls. A $5,000 table limit stops you from doubling at a certain point. Also, the probability of long losing streaks is higher than most people think—the chance of losing 8 roulette spins in a row is about 1 in 170, which happens regularly.

The Martingale can be effective for very short sessions with a modest win goal. If you want to win one unit and stop, the system has a high probability of achieving this in a small number of bets. Just be prepared for the rare catastrophic loss.