The Martingale System
The Martingale is a betting system where you double your stake after every loss, aiming to recover all losses plus one unit with a single win. It produces frequent small wins but risks rapid, catastrophic losses against table limits — and never changes the house edge.
| Rule | Double the bet after each loss |
|---|---|
| Goal | Recover losses + 1 unit on a win |
| Fatal Flaw | Table limits + exponential bet growth |
| Edge Effect | None |
How the Martingale works
Applied to an even-money bet like red/black in roulette, you bet one unit; if you lose, you bet two, then four, then eight, and so on. The first win recovers every prior loss plus a one-unit profit, after which you start again. Because wins are common on even-money bets, the system delivers a steady stream of small gains — which is exactly what makes it seductive.
Why it fails
Losing streaks are inevitable, and the bets grow exponentially: eight losses in a row means a ninth bet of 256 units just to win one. You quickly hit the table maximum or exhaust your bankroll, locking in a huge loss that erases many small wins. The even-money bet still carries its house edge on every spin, so the long-run expectation stays negative. The Martingale rearranges risk; it never removes it.
Frequently asked questions
Does the Martingale guarantee a profit?
No. Table limits and finite bankrolls mean a long enough losing streak produces a loss far larger than the accumulated small wins.
Why does doubling not beat the house edge?
Each spin is independent and carries the same edge regardless of previous results. Changing bet size cannot change the underlying probabilities.
Sources
- Probability theory
- Responsible-gambling guidance