Work out bankroll management instantly with clear inputs, formula shown and shareable results.
Flat staking risks a fixed amount so the bankroll falls linearly, while percentage staking recalculates each time and decays geometrically, which is why it can never reach zero. At 2% a bankroll survives 50 straight losses flat-staked but retains 82% of its value under percentage staking, which is the whole argument for proportional bet sizing.
Flat staking
bankroll after n losses = bankroll - stake x n
Percentage staking
bankroll after n losses = bankroll x (1 - risk fraction) ^ n
bankroll after n losses = bankroll - stake x n. Flat staking risks a fixed amount so the bankroll falls linearly, while percentage staking recalculates each time and decays geometrically, which is why it can never reach zero.
At 2% a bankroll survives 50 straight losses flat-staked but retains 82% of its value under percentage staking, which is the whole argument for proportional bet sizing.
Enter bankroll, risk per bet, losing streak to survive. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.