Free tool
Martingale calculator
Double after every loss, back to the base bet after a win. Enter your numbers to see every bet, how many losses in a row your money covers, how often a run is lost — and how often you would really reach your goal.
How to read the result
Losses in a row you can afford is the number of levels your bankroll and the table limit allow. Chance of losing a run is how often every one of those levels loses — when it happens, you lose everything staked in that run. Chance of reaching your goal comes from 10,000 simulated players, each starting with your bankroll and playing until they reach the goal or can no longer cover the base bet.
The pattern is always the same: many small wins and one rare, large loss. That is the trade every progression makes. On the Martingale system page you can see the full test on both wheels, and the 100 Club compares it with 100 other systems.
Questions
Does the Martingale strategy work in roulette?
It works often and fails rarely but expensively. With enough bankroll it reaches a small goal most of the time, because one win recovers every loss in a run. But a long losing streak or the table limit eventually ends a run and costs everything you staked in it. The house edge stays the same: on average you lose 2.7% of everything you bet on a European wheel.
How many losses in a row can I afford with Martingale?
Add up the bets: base bet × (1 + 2 + 4 + 8 …). With a $10 base bet, $310 covers 5 losses, $1,270 covers 7 and $2,550 covers 8. Each extra level doubles the money you need — the calculator shows the exact number for your bankroll and table limit.
What is the chance of losing a Martingale run?
On a European wheel an even-money bet loses 19 times in 37. The chance of losing every level is 0.514 to the power of the number of levels: about 1 in 28 runs with 5 levels, 1 in 106 with 7 levels and 1 in 206 with 8 levels. On an American wheel it is higher.
Why does the table limit matter?
Because the bets double. A $10 base bet reaches $640 after six losses and $1,280 after seven. If the table limit is $500, the progression stops after six levels no matter how much money you have.
Is Martingale the best roulette system?
For a small, fixed goal it comes close to the mathematical best: in our test of 100+ systems, an 8-level Martingale sits right at the Bold Play ceiling for a +$50 goal. That is because one win always pays back exactly what the run cost — not because it beats the house. Every system loses the house edge in the long run.