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Maximum Drawdown: A Different Way to Measure Risk

Portfolio Construction and Risk • Beginner Investing • 6 min

What this lesson is about

Standard deviation tells you how bumpy the ride typically is. Maximum drawdown tells you the single worst stretch you'd actually have had to survive, a genuinely different and more visceral question.

2 parts · a quick check after each · then the quiz

Part 1 of 2

Standard deviation shows you how bumpy an investment's ride usually is. Maximum drawdown, however, asks a different question: what's the worst stretch an investor has faced? It measures the drop from the highest point to the lowest before a new high was reached. Maximum drawdown is expressed as a percentage decline. For example, if an investment peaks at $100 and later drops to $60, that’s a 40% maximum drawdown. This holds true no matter how long the decline lasted or how it compares to daily ups and downs.

This measure complements standard deviation rather than repeating it. Standard deviation looks at the overall variability in an investment's return history. It’s a statistical average. On the other hand, maximum drawdown shows the worst REALIZED outcome an investor has experienced. It doesn’t matter how typical or unusual that event was. Many investors find maximum drawdown easier to understand. Saying "this investment has fallen 45% at its worst point" connects more directly to how people remember tough investment periods compared to a more abstract concept like standard deviation.

What a loss costs to undoA fall of half needs a gain of double. Move the loss and see.

Quick check

What is "maximum drawdown"?

Part 2 of 2

Insider Angle: But depth alone doesn’t tell the whole story. The recovery time after a drawdown is crucial information. A 30% drop that recovers in six months feels different from a 30% drop that takes five years to bounce back. This matters, especially if you need to withdraw money during recovery. It ties back to the sequence of returns risk discussed elsewhere in this module. The combination of depth and recovery time is why maximum drawdown is a useful self-assessment tool. Imagining living through a specific historical drawdown’s full impact and duration helps you gauge your real risk tolerance better than answering an abstract questionnaire about volatility.
Try This: Research the maximum drawdown for a broad stock market index, like the S&P 500 during 2008-2009 or the COVID crash of 2020. Find out how long it took the index to fully recover to its prior peak after each of these drawdowns.

Quick check

How does maximum drawdown differ conceptually from standard deviation as a risk measure?

Quiz

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