My trading returns is about 50% monthly(alpha) and maximum drawdown is about 20%. Is there a mathematical way to define the optimal withdrawal rate X%(say when profit level reach y%) to avoid risk of 50% ruin? i.e. how to find X% & y% for the best balance between risk vs compounding rate? For e.g, withdrawing 50% of monthly profits if quarterly max drawdown is 25% and compound the rest of the profits... simplified Withdrawal rate =the inverse of calmar ratio.