Martingale Risk Calculator
Calculate how many consecutive losses your bankroll and the table limit can withstand.
What the calculator measures
The calculator doubles an opening even-money stake after each hypothetical loss. It stops when the next stake exceeds either the remaining bankroll or the table maximum. The displayed streak probability is the chance of losing that many consecutive even-money decisions from a specified starting point.
It is not the chance of experiencing such a streak at least once during a long session. With repeated opportunities, the probability of encountering a run increases.
Why small opening bets become large
Starting from one unit, eight consecutive stakes are 1, 2, 4, 8, 16, 32, 64 and 128. They require 255 units in total. The next stake would be 256 units merely to pursue a one-unit target. A table limit can stop the progression even when additional cash remains.
Interpretation
Martingale concentrates many one-unit wins around occasional losses of the full progression. It does not turn an even-money roulette wager into a fair coin toss because zero—and double zero on an American wheel—remain losing results for red/black, odd/even and high/low bets.