Why doubling-down math destroys accounts.
This tool exists to show why martingale sizing destroys accounts, not to tune one. Each doubling recovers one base win while risking geometric ruin.
Educational tool only — not financial advice. Verify figures with your broker.
The Martingale Calculator is an educational danger demo that shows what martingale (double-after-a-loss) sizing actually demands as a losing streak grows. It answers 'how big does my next stake get, how much have I committed, and how close to ruin am I?' — built to expose why the strategy fails, not to help you run one.
After L consecutive losses the next stake is baseStake × multiplier^L, and the total lost so far is the sum of the geometric series baseStake × (multiplier^L − 1) / (multiplier − 1). 'Losses until stake exceeds equity' solves for the smallest number of further doublings where the stake passes account equity, while the anti-martingale line halves the stake instead of doubling it.
No. This martingale calculator shows why: each doubling recovers only one base-stake win while the required stake grows geometrically, so a long-enough losing streak — which is statistically normal — exceeds any finite account.
It depends on your base stake and equity, but far fewer than most expect. The 'Losses until stake exceeds equity' output gives the exact count for your inputs.
Anti-martingale halves the stake after a loss instead of doubling it, shrinking exposure during a streak. The tool shows it as a contrast, not a recommendation.
Keep in mind: This tool exists to demonstrate why martingale sizing destroys accounts, not to tune one. Each doubling recovers a single base win while risking geometric ruin, and no output here implies the approach can be made safe or profitable.