American roulette looks almost identical to the European wheel, but the extra double zero changes the math in ways that matter for any betting system. If you have a choice, the Martingale roulette calculator will show you why the American wheel is the least favourable place to run the progression.
The Double Zero
An American wheel has 38 pockets: 1 to 36 plus a single zero and a double zero. That second green pocket is the only structural difference from the European wheel, but it is enough to double the house edge on even-money bets.
Win Probability of 18/38
An even-money bet still wins on 18 numbers, but now out of 38 pockets, so the win probability falls to 18/38 (about 47.4%). Fewer wins per hundred spins means the doubling progression has to work harder to recover.
Loss Probability of 20/38
The loss probability rises to 20/38 (about 52.63%). That higher per-spin loss rate makes deep losing streaks marginally more common than on the European wheel, and in a doubling system marginal differences in streak frequency translate into real differences in failure rate.
The 5.26% House Edge
The two green pockets produce a 5.26% house edge, nearly double the European figure. Because the edge applies to every dollar wagered, and Martingale wagers a great deal, the drag on expected value is substantial over a long session.
Why Double Zero Matters
The double zero does two things at once: it lowers your win rate and raises your loss rate on the exact bets Martingale relies on. Both effects push in the wrong direction, which is why the American wheel produces faster, deeper drawdowns in simulation.
American vs European and French
The European wheel has one zero and a 2.70% edge, while French roulette adds La Partage for an effective 1.35% edge on even-money bets. American roulette is worse than both. The complete ranking is on the best roulette variant page.
Example Progression and Risk Warning
The doubling sequence itself is the same as any wheel: $10, $20, $40, $80 and so on. What changes is that each bet loses slightly more often, so the progression reaches its failure point sooner on average. American roulette does not make Martingale profitable and, of the common variants, it is the one most likely to end a session with a large loss.