Max Drawdown Calculator

What is Maximum Drawdown?

Maximum Drawdown (MDD) is a specific measure of historical downside risk. It represents the maximum observed loss from a peak to a trough of a portfolio, before a new peak is attained. It is a critical metric for assessing the true volatility and risk profile of an investment strategy, as it directly answers the question: "What is the worst I could have done by buying at the top and selling at the bottom?"

The simple mathematical formula is:
Max Drawdown = ((Peak Value - Trough Value) / Peak Value) × 100

Why is MDD critical? While metrics like standard deviation measure general volatility, they don't capture the psychological and practical pain of sustained capital destruction. Large drawdowns are notoriously difficult to recover from. A 50% drawdown requires a 100% gain just to break even and return to the previous peak. The simulated line chart effectively visualizes this journey from the height of the portfolio's value down to its most painful low point.

Understanding your maximum drawdown helps inform proper position sizing, leverage utilization, and risk management protocols. Traders employing high leverage are especially susceptible to portfolio-ruining drawdowns.

To further evaluate these risk dynamics, we recommend utilizing the Leverage Impact on Returns Calculator to see how leverage amplifies these drawdowns, and the Value at Risk (VaR) Estimator for predicting the likelihood of significant daily or weekly losses.