1. What is Max Drawdown

Max Drawdown (Max DD) is the largest peak-to-trough decline an account/strategy has suffered in the period examined. It's the "worst historical pain" — the real risk you must be prepared to endure.

(See the Drawdown concept in Risk Management; here Max DD is viewed as a performance metric.)

2. Why it matters

  • Max DD decides whether a strategy is followable in real life. Pretty returns with a 60% Max DD means most people quit before the returns arrive.
  • It must always sit next to returns when evaluating: "how much it makes" is meaningless without "how big a dip you must endure to make it".

3. Ways to view it

  • Depth (how much % lost) and recovery time (how long back to the old peak) — both matter.
  • Compare Max DD with returns: many use return / Max DD to gauge "quality" (e.g. the Calmar ratio).
  • Recall the recovery table (Risk Management): the deeper the DD, the more the gain-to-recover rises non-linearly.

4. How to apply

  • When choosing/evaluating a strategy: put Max DD on the table with returns and expectancy.
  • Ask honestly: "could I stomach a dip the size of the historical Max DD?" If not, it's not for you however high the returns.
  • Use Max DD to set your personal risk limit and capital size.

5. Worked example

Two strategies both return 40%/yr: A has Max DD 15%, B has Max DD 55%. Both profit in theory, but B demands you endure losing over half the account — which very few can do. A is a "livable" strategy; B is pretty on paper.

6. Common mistakes

  • Choosing a strategy by returns alone, ignoring Max DD.
  • Underestimating the real feeling of being mid-way through a deep drawdown.
  • Forgetting recovery time — preparing for the depth but not the long grind.

7. FAQ

  • What Max DD is acceptable? Depends on appetite and capital size; smaller is easier to follow. The key is that you can actually endure that number.
  • Does past Max DD repeat? The future can be worse than the past. Treat historical Max DD as a minimum to prepare for, not a ceiling.

8. Tools

  • A tool to compute Max Drawdown and recovery time from an equity curve.

9. Checklist

  • ☐ Do I know the strategy's historical Max DD?
  • ☐ Do I place it next to returns when evaluating?
  • ☐ Could I truly endure a dip the size of that Max DD?