Max Drawdown: The Risk Metric Every Investor Should Understand

Volatility is the risk metric finance professors love. Max drawdown is the risk metric you should care about more.

Max drawdown is the largest peak-to-trough decline a portfolio experienced during a given period, expressed as a percentage. It answers the only question that matters when markets are crashing: how bad did it get before it recovered?

Why drawdown beats volatility for real humans

Volatility measures the average size of fluctuations. It treats upward and downward moves symmetrically. A portfolio that gains 30% one year and loses 25% the next is "volatile." A portfolio that gains 5% nine years in a row and loses 60% in year ten is also volatile — by some measures more, by some measures less. Mathematically, both have a number you can plot.

Psychologically, those two portfolios are nothing alike. The second one will cause you to sell at the bottom of year ten and never come back. The first one is annoying but holdable.

Max drawdown captures the part of risk that actually breaks investors: how big and how long the painful periods were.

Famous historical drawdowns

A few drawdowns to anchor your sense of scale:

• S&P 500, 2007–2009 (financial crisis): –57%
• S&P 500, 2020 (COVID crash): –34% (recovered in months)
• S&P 500, 2022 (rate-hike bear market): –25%
• Nasdaq, 2000–2002 (dot-com): –78%, took ~15 years to recover in real terms
• Bitcoin, 2017–2018: –84%
• Bitcoin, 2021–2022: –77%
• Long-term Treasuries, 2020–2023: ~–40% (the "safe" asset)

Even "safe" assets have brutal drawdowns. The 2020–2023 collapse in long-duration bonds shocked a generation of investors who thought their bond allocation was a hedge.

The psychology of holding through

Knowing intellectually that "the market always recovers" does not prepare you for the lived experience of watching half your savings disappear over 18 months while the news tells you every day that this time it really is different. Most retail investors who lived through 2008 sold somewhere near the bottom and did not buy back in for years. They missed the entire recovery.

The portfolio you can actually hold through a 50% drawdown is dramatically better than the portfolio with a higher theoretical CAGR that you sell during the bottom.

Using drawdown to choose between portfolios

Here is a useful exercise. Imagine two portfolios with identical 9% CAGRs over a decade:

• Portfolio A: max drawdown of –20%
• Portfolio B: max drawdown of –55%

Same return. Wildly different experience. For almost every investor, Portfolio A is the better choice — even if a model suggests Portfolio B has slightly better risk-adjusted return on paper. Because Portfolio B is the one you sell.

This is why a sensible portfolio construction process should include a drawdown constraint: "I want a portfolio whose worst-case decline I could live through." For most people, that ceiling is somewhere between –25% and –40%. Above that and the odds of behavioural mistakes get high.

A rule of thumb

A rough rule that has held up across markets: a 100% stock portfolio will, at some point in your investing lifetime, drop by ~50%. A 60/40 portfolio will, at some point, drop by ~30%. A 40/60 portfolio will, at some point, drop by ~20%. Plan accordingly.

See your own numbers

Open What-If Portfolio and load a preset. The stats bar shows max drawdown for whatever date range you've selected. Try the 10Y range across a balanced portfolio versus an all-stock portfolio. The drawdown gap tells you what kind of investor you actually are.