Drawdown — Trading Wiki

What Drawdown means

The decline from a portfolio's peak value to its lowest point before a new peak. Maximum drawdown measures worst-case historical loss. Critical for risk assessment.

In depth

Drawdown is a risk metric that measures the decline in value from a portfolio's or trading account's peak (highest point) to its subsequent trough (lowest point) before a new peak is established. Expressed as a percentage, it quantifies the worst-case loss experience during a specific time period and is one of the most important measures of investment risk because it directly represents the real-world pain that an investor or trader experiences. Maximum drawdown (MDD) is the largest peak-to-trough decline ever recorded for a particular strategy, fund, or account.

It represents the worst historical loss and provides a baseline expectation for the most extreme adverse scenario. For example, if an account grew from $100,000 to $150,000, then declined to $110,000 before recovering to $160,000, the maximum drawdown was $40,000 / $150,000 = 26.7%. Recovery from drawdowns requires disproportionate gains — a mathematical reality that makes drawdown control critical. A 10% drawdown requires an 11.1% gain to recover. A 20% drawdown requires a 25% gain. A 50% drawdown requires a 100% gain (doubling your money) to return to the previous peak.

A 90% drawdown requires a 900% gain. This asymmetric math is why professional risk managers obsess over drawdown control rather than maximizing returns. In quantitative finance, strategies are often evaluated using the Calmar Ratio (annualized return divided by maximum drawdown), the Sortino Ratio (return divided by downside deviation), or the MAR Ratio (minimum acceptable return versus maximum drawdown). A strategy with 20% annual returns and a 10% maximum drawdown (Calmar Ratio of 2.0) is generally preferred over one with 40% returns and a 30% drawdown (Calmar Ratio of 1.33) because the risk-adjusted return is superior.

Key points

• Peak-to-trough decline measuring worst-case loss experience
• 50% drawdown requires 100% gain to recover — math is asymmetric
• Calmar Ratio (return/drawdown) measures risk-adjusted performance

Practical tip

Set a maximum acceptable drawdown before you start trading — typically 10-15% for conservative traders, 20-25% for aggressive traders. If you hit your max drawdown, STOP TRADING and review your strategy. The worst thing you can do during a drawdown is increase position sizes to 'make it back' — this is how 10% drawdowns become 50% drawdowns.

Why it matters when you are learning

Drawdown is the number that actually matters for longevity. Big returns mean nothing if a 60% drawdown causes you to panic-quit. Control your drawdown, and returns take care of themselves.

Practising Drawdown on the simulator

Reading about Drawdown and using it are different skills. Try it once in the simulator on an instrument you already follow, write down beforehand what you expect to happen, and check the journal a day later to see whether it played out that way. Educational simulation only — not financial advice.