Maximum Drawdown

Maximum Drawdown is the largest peak‑to‑trough decline experienced by a trading account over a specified period. It measures the deepest loss from an equity high to the subsequent low before a new high is reached, expressed as a percentage of the peak value. This metric is a core component of risk assessment because it reveals how much capital could be eroded during adverse market moves, independent of the frequency or size of individual losses.

How It Works

To calculate Maximum Drawdown, the equity curve of the account is tracked from the start of the observation window. Each time the equity reaches a new highest point (a peak), that value becomes the reference for the next potential drawdown. When the equity falls below that peak, the difference between the peak and the current low is recorded as a drawdown. The process continues, updating the peak whenever a new high is surpassed. The Maximum Drawdown is the greatest of all recorded drawdowns, usually shown as:

• Maximum Drawdown = (Peak − Trough) / Peak × 100%

On platforms such as MetaTrader 5, the equity curve is available in the account history tab, allowing traders to view drawdown statistics directly or export them for further analysis.

Why It Matters for Traders

Maximum Drawdown provides insight into the worst‑case scenario a strategy might face, helping traders size positions appropriately and set realistic risk tolerance levels. A strategy with high returns but an excessively large drawdown may be unsuitable for conservative investors, whereas a modest drawdown combined with steady gains often indicates smoother equity growth. Risk managers use this figure to evaluate leverage, determine stop‑loss placement, and decide whether a trading approach aligns with the capital preservation goals of the client or fund.

Example

Assume an account starts with $10,000. Over six months the equity rises to $12,000 (peak), then falls to $9,000 (trough) before recovering to $11,500 and later reaching a new peak of $13,000. The drawdown from the first peak is:

• ($12,000 − $9,000) / $12,000 × 100% = 25%

Later, the equity drops from $13,000 to $10,400, a drawdown of:

• ($13,000 − $10,400) / $13,000 × 100% = 20%

The Maximum Drawdown for the period is the larger of the two, 25%. This tells the trader that, at worst, the account lost one quarter of its highest value before recovering.

Key Takeaways

• Maximum Drawdown quantifies the biggest historical loss from a peak to a trough, expressed as a percentage of the peak.
• It is calculated by tracking the equity curve, updating peaks when new highs appear, and measuring each subsequent decline.
• The metric is essential for risk management, guiding position sizing, leverage decisions, and strategy suitability for different investor profiles.
• A lower Maximum Drawdown generally indicates smoother equity growth, while a high value warns of potential large capital erosion during adverse markets.