TL;DR: A correction is the standard label for a market fall of 10 percent or more from a recent peak, but less than 20 percent. At 20 percent or more, the standard label becomes a bear market. A smaller fall, often around 5 percent, is commonly called a pullback or dip, though that term has no formal threshold. The percentages are measured on an index, usually from its closing high to its closing low, and the labels describe size only. They say nothing by themselves about cause, duration, or what happens next.
Key Takeaways
- The thresholds are conventions, labelled here as standard definitions: correction at 10 percent, bear market at 20 percent, both measured from a recent high.
- A correction is declared in hindsight. An index down 9 percent is not yet in correction by the standard definition, however dramatic the headlines feel.
- Corrections are a normal feature of markets, and this guide asserts no frequency statistic, because any honest figure depends on the index and period chosen.
- The label applies to the index being measured. One index can be in correction while another, or an individual stock, is down far more or far less.
- Your response should be set by your plan, time horizon, and cash needs, not by the label itself. A correction changes prices. It does not automatically change the value of a sound long term holding or the wisdom of a planned purchase.
How is a correction measured?
Pick an index, for example a broad index you track, find its recent closing high, and compare the current close with that peak. If the index closed at 100 at its high and later closes at 89, the fall is 11 percent, which meets the standard correction definition. If it closes at 79, the fall is 21 percent, which meets the standard bear market definition. Index points in this paragraph are illustrative, chosen to make the percentages transparent.
Two measurement details matter. First, most market commentary uses closing prices, not intraday lows, so an index can dip below a threshold during a session without officially crossing it on a close. Second, the clock for a new correction generally starts from the most recent high, so after a recovery to a new peak, the next 10 percent fall counts from that new peak. Recovery itself is only confirmed when the index climbs back to a new high, which is why commentary can describe a market as still in correction months after the low, while prices are rising but remain below the old peak.
What causes corrections?
There is rarely one cause, and post hoc explanations should be read with skepticism. Common contributors include interest rate expectations changing, economic data disappointing relative to what investors expected, company earnings or guidance falling short, valuations that had stretched far ahead of earnings, and geopolitical shocks. Often the honest description is that sellers outnumbered buyers at previous prices after a strong run, and a trigger, large or small, started a repricing that momentum then amplified.
What a correction is not: it is not proof the economy is in recession, since markets and economies frequently diverge in timing and direction. It is not a crash, a word best reserved for sudden, severe falls over days rather than a 10 percent slide over weeks or months. And it is not a signal with a fixed meaning. Some corrections deepen into bear markets and some end quickly and recover, and at the moment the 10 percent line is crossed, nobody can tell you reliably which kind you are in. Any source claiming certainty at that point is selling confidence, not analysis. Watching indicators such as the VIX can tell you how much fear is priced into options markets, which is information about sentiment, not a forecast.
What should an investor actually do during one?
Start with facts about your own position, not the index. Do you need the invested money within the next few years? If yes, a correction is a prompt to reconsider how much risk your time horizon can carry, ideally with advice for your situation. Is your emergency fund intact, so no forced selling is likely? Our emergency fund calculator guide covers sizing that buffer. Are your holdings diversified, or is one stock driving your personal fall far beyond the index figure?
For long term investors with a written plan, the typical plan consistent responses are unglamorous: keep scheduled contributions running, rebalance if your allocation rule has genuinely been triggered, as explained in the portfolio rebalancing guide, and use tools such as moving averages to describe the trend rather than to manufacture certainty. Checking prices hourly and trading on headlines converts a normal market event into realised losses and tax events with remarkable efficiency.
If a correction tempts you to buy, size any purchase as part of the plan, in stages, with money you will not need soon, and write down why the price fall changes the opportunity rather than merely the mood. If it tempts you to sell everything, write down what would have to happen for you to buy back in, because without that rule, most investors who exit never re enter and miss the recovery the definitions above are measured against.
The word correction itself implies something was corrected. Treat it that way: a repricing to sit through with a plan, not a verdict on your competence or a command to act today.
Sources and method
- Target keyword: "stock market correction" from .saeo/keywords.yaml candidate added 2026-10-25. No search volume or difficulty figure is claimed.
- Definitions are labelled as standard market conventions: correction, a fall of 10 percent or more from a recent high, bear market at 20 percent or more. No frequency, duration, or recovery statistics are asserted, because such figures depend on index and period selection.
- Index point figures are labelled illustrative examples. Arithmetic verified for this draft on 2026-10-25: a fall from 100 to 89 is 11 percent, from 100 to 79 is 21 percent.
- Internal links checked against existing drafts in this folder on 2026-10-25, plus portfolio-rebalancing-explained drafted in this same run: what-is-the-vix, emergency-fund-calculator, moving-averages-explained, portfolio-rebalancing-explained.
