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Returns show where an investment ended up. Volatility and drawdowns show what the journey felt like, and whether you could have stayed on it.
Volatility describes how much an investment's returns swing up and down. A savings account is barely volatile: its balance rises slowly and steadily. A stock index is much more volatile: it can gain 25% one year and lose 18% the next. Volatility is the most common way to describe the "bumpiness" of an investment.
The standard way to measure it is standard deviation, which tells you how far returns typically land from their average. A higher number means a wider range of outcomes. For the S&P 500, the standard deviation of yearly total returns from 1926 through 2025 was about 19.5%, against an average of roughly 12.4% a year. That means a typical year usually landed anywhere from about −7% to +32%, and in this record, 67 of 100 calendar years fell inside that range.
A drawdown is the decline from a peak to the lowest point that follows, before a new high is reached. It answers a very practical question: how much did I lose at the worst moment? The largest decline an investment has had is called its maximum drawdown.
| Term | Common Definition | What It Feels Like |
|---|---|---|
| Pullback | A decline of about 5% to 10% from a recent high | Unpleasant but routine |
| Correction | A decline of 10% or more from a recent high | Headlines start to get louder |
| Bear market | A decline of 20% or more from a recent high | Real money is gone on paper |
| Maximum drawdown | The single worst peak-to-trough decline over a period | The worst moment of the ride |
Volatility and drawdown are related but not identical. Volatility measures the general size of the swings, while a drawdown measures the specific damage between a high and a low. Many investors find drawdowns easier to relate to, since they translate directly into dollars.
Say Tara compares two investments over five years. Both have an average yearly return of 7.6%. Investment A grows steadily. Investment B swings widely: +30%, −15%, +25%, −10%, and +8%.
| Year | Investment A (steady 7.6%) | Investment B (volatile) | B's Return That Year |
|---|---|---|---|
| Start | $10,000 | $10,000 | — |
| 1 | $10,760 | $13,000 | +30% |
| 2 | $11,578 | $11,050 | −15% |
| 3 | $12,458 | $13,813 | +25% |
| 4 | $13,405 | $12,431 | −10% |
| 5 | $14,423 | $13,426 | +8% |
These are simple illustrations, not predictions or guarantees. Both investments have the same 7.6% simple average, but A ends at about $14,423 and B at about $13,426, roughly $1,000 lower. B's compound growth rate is only about 6.1% a year. The more an investment swings, the larger the gap between its average return and what you actually earn. This is the same effect we covered in our lesson on CAGR, and it's sometimes called "volatility drag."
Percentages aren't symmetric. If a $10,000 investment falls 50%, it's worth $5,000. To get back to $10,000, it needs to gain 100%, not 50%, because the gain is calculated on a smaller balance.
| Loss From the Peak | Gain Needed to Break Even |
|---|---|
| 10% | About 11.1% |
| 20% | 25% |
| 25% | About 33.3% |
| 34% | About 51.5% |
| 50% | 100% |
| 57% | About 133% |
The deeper the drawdown, the steeper the climb back. That's why limiting big losses can matter as much as chasing big gains.
Here are some of the largest declines in the S&P 500, measured on a price-only basis from peak to trough.
| Episode | Peak-to-Trough Decline | How Long the Decline Lasted | Regained the Prior High |
|---|---|---|---|
| Great Depression (1929–1932) | Roughly −86% | About 2 years and 9 months | Roughly 25 years, on a price-only basis |
| Dot-com bust (2000–2002) | About −49% | About 2 years and 7 months | May 2007 |
| Global financial crisis (2007–2009) | About −57% | About 1 year and 5 months | March 2013 |
| COVID-19 crash (2020) | About −34% | 33 days | August 2020 |
| Inflation and rate-hike bear market (2022) | About −25% | About 9 months | January 2024 |
The pattern is worth noticing. Depth didn't predict recovery time: the 2020 decline was faster and shallower than 2008 and also recovered far sooner. Also, these figures are price-only, so an investor who reinvested dividends would generally have recovered somewhat sooner. And the worst episodes were rare: the 1929 collapse remains an extreme outlier, and by one common count the S&P 500 has had around seven bear markets in the last 50 years.
Drawdowns don't only happen in bad years. Analysis from J.P. Morgan Asset Management has found that since 1980 the S&P 500 has experienced an average decline of about 14% at some point within each calendar year, and yet it finished the year higher in most of those years. Put simply, a double-digit drop somewhere along the way is normal, even in years that end well.
If you can expect a dip of that size in an ordinary year, then a 10% or 15% decline is not a sign that something is broken. It is part of what you accept in exchange for stock market returns.
Holding a mix of assets, such as stocks and bonds, usually reduces drawdowns because different investments don't always fall at the same time. In one J.P. Morgan analysis covering 1980 to 2019, a 60% stock and 40% bond portfolio had an average yearly decline of about 7.5% from peak to trough, compared with roughly 14% for stocks alone.
| Portfolio Mix (illustrative) | Typical Ride | Trade-Off |
|---|---|---|
| Mostly stocks | Larger swings and deeper drawdowns | Higher long-run growth potential |
| Balanced mix of stocks and bonds | Smaller swings and shallower drawdowns | Lower expected long-run growth |
| Mostly bonds and cash | The smallest swings | Growth may not keep up with inflation |
Diversification doesn't eliminate losses, and no mix is right for everyone. The right balance depends on your goals, your time horizon, and how much decline you can tolerate without changing course.
A paper loss only becomes a permanent loss if you sell. The urge to sell is strongest at the worst moments, and the best days in the market often arrive close to the worst ones. In a J.P. Morgan Asset Management analysis of the last 20 years, an investor who missed just the 10 best days saw the annualized return cut nearly in half compared with staying fully invested. Nobody can reliably pick those days in advance.
That's why it helps to decide in advance how you'll respond to a decline. Selling after a large drop can lock in the loss and risk missing the rebound.
Say Owen has $500,000 invested entirely in stocks and experiences a 34% decline, similar to the 2020 crash. His balance falls to about $330,000, a loss of $170,000 on paper. To get back to $500,000, that $330,000 needs to grow by about 51.5%. If he needs the money in the next year or two, a decline like this could force him to sell at a bad time. If he's 25 years from needing it and keeps investing, the same dip looks very different.
The lesson is that the same drawdown affects people differently depending on their time horizon. Our Financial Independence course covers a related idea, sequence of returns risk, which matters most for people who are withdrawing money.
| When You'll Need the Money | How Drawdowns Matter |
|---|---|
| Many decades away | Time gives an investment room to recover, and regular contributions can buy more shares at lower prices |
| 5 to 10 years away | A large decline is harder to recover from, so many people shift toward steadier assets as the date approaches |
| Within a few years | A bear market could arrive right when you need the money, so money for near-term goals usually belongs in safer holdings |
This table is general education, not personal advice. Your own situation, including your income, other savings, and comfort with risk, should shape the decision.
| Question to Ask | Why It Helps |
|---|---|
| How far did my portfolio fall in the last big decline? | Many brokerage tools show past drawdowns and gives you a real-life reference point |
| What would a 30% drop look like in dollars? | Turning a percentage into dollars makes the risk concrete |
| When will I actually need this money? | Your time horizon decides how much decline you can afford |
| How do I think I'd react to a large drop? | Being honest about your reaction helps you avoid panic decisions |
To see how different growth assumptions play out, try our Compound Interest Calculator, and use our 401(k) Projector to test a lower-return scenario. For the long-term context behind these swings, see our lesson on S&P 500 historical returns.
1. Judging an investment by its average return alone. Two investments with the same average can end in very different places, and they can feel very different to hold.
2. Forgetting that recovery requires a bigger gain than the loss. A 50% drop needs a 100% gain to break even, so deep losses are far harder to undo than they look.
3. Treating a paper loss as a permanent loss. A decline is temporary until you sell. The larger risk is often reacting to it at the wrong time.
4. Taking on more risk than your time horizon allows. Money you'll need soon shouldn't depend on the market being up at that moment.
5. Overestimating your own risk tolerance. It's easy to feel comfortable with risk when markets are rising. Consider how you'd feel after losing 30% before choosing your mix.
Key Takeaway: Volatility measures how much an investment swings, and a drawdown measures how far it falls from a peak, so understanding both, along with the fact that deep losses need bigger gains to recover, helps you choose a portfolio you can actually stay invested in.
Volatility is one measure of risk: how much returns swing. Risk is broader and includes the chance of a permanent loss, not meeting your goals, or having to sell at a bad time. Volatility alone doesn't capture all of that.
By common definitions, a correction is a decline of 10% or more from a recent high, while a bear market is a decline of 20% or more.
It varies widely. Among the recent examples in this lesson, the 2020 decline was regained within months, while the 2007–2009 decline took until 2013. The Great Depression took roughly 25 years on a price-only basis. Past recoveries don't guarantee future ones.
No. It can reduce their size, but a diversified portfolio can still fall, especially when several asset types decline at once. The goal is a ride you can stick with, not a ride without dips.
That depends on your personal situation, and it's best to decide your approach before a decline happens. Selling after a large drop can lock in a loss and risk missing the recovery, so consider talking with a qualified professional before making a big change.
There's no universal answer. The right level is one that fits your goals, your time horizon, and the amount of decline you can tolerate without abandoning your plan.
Disclaimer: This article is for general educational purposes only and does not constitute personalized financial, investment, tax, or legal advice. Figures, rates, and rules mentioned may change over time — verify current details with an official source or a qualified professional before making financial decisions.