Financial term · Reviewed August 17, 2026

Bear market

Bear market: A sustained decline in a market, commonly defined as a fall of twenty percent or more from a recent peak. The twenty percent is a convention. Nothing technical marks that line. It shapes how other figures are read instead of being a number a single calculator returns: in the investing & returns category, it bears most directly on tools like the DCA vs. Lump Sum Calculator and the Investment Beta Calculator.

Twenty percent off a recent peak is the usual line, and the line is a convention instead of anything the market itself recognises. What matters is not the label but what people do when they hear it. A bear market is the moment a plan built for exactly this scenario gets abandoned, usually near the bottom, by someone who was entirely sincere about their risk tolerance when the number was going up. Deciding your response in advance is worth more than deciding what to call it.

Quick reference: Bear market.
TermBear market
CategoryInvesting & Returns
TypeInterpretive concept: read alongside a computed figure
Related terms8 defined in this glossary

Before you rely on it

What to check

Note what the decline is measured from. A fall from a recent peak and a fall from your purchase price are different numbers.

The common error

Where people go wrong with bear market

Selling to 'wait for clarity'. Clarity arrives with the recovery already priced in, and the cost of missing a handful of the strongest days is far larger than most people expect.

Worked through

Bear market in plain numbers

An index falls from 4,000 to 3,200. That is a 20% drop, the threshold commonly used to call a bear market. To get back to 4,000 from 3,200 it must rise 25%, because the gain applies to a smaller base; a 50% fall needs a 100% rise. This asymmetry is why large declines feel so heavy. Now picture someone who put $10,000 in at the peak. At 3,200 the position is worth $8,000. They have lost $2,000, and only a 25% recovery brings them level. Time in the market and the starting point both shape the outcome.

Easily confused

Bear market and its neighbours

A bear market is a sustained decline, not a correction and not a crash; a correction is usually a fall of ten percent or more, and often a shorter one. A crash is a sudden, sharp drop over days. A bear market is longer and deeper, and it commonly comes with worsening economic news, and it is also different from a recession, which is a measure of the economy rather than of prices, though the two often overlap. The twenty percent line is a convention, not a rule of nature, so a decline of nineteen percent is not meaningfully different.

In real decisions

Where bear market turns up

Investors use the label to describe conditions and to prompt a review of plans; retirees watch for it because withdrawals during a decline lock in losses; advisors talk about it when explaining why an allocation should match a client's tolerance for drawdowns. Historical bear markets give a range for planning stress tests, from a few months to a few years. It also helps to separate news from behavior: the decision that matters is what you do, and a written plan made in calm conditions helps.

Know the edges

Where bear market stops being reliable

Nobody can reliably say when a bear market starts or ends. It is only obvious afterward. Declines that look like the start of one often reverse, and rallies inside one can be sharp. Averages hide big differences between sectors and countries. Past declines do not predict the size or length of the next one. If a fall would force you to sell, or would cause distress, that is a sign your risk level may not suit you, a topic worth reviewing with a qualified professional.

Quick answers

What people ask about bear market

How long do bear markets usually last? Historically they vary from a few months to a few years, and their depth varies too. Averages hide big differences, and no rule says when one will end. Planning for a range of lengths is wiser than guessing.

Should I sell during a bear market? That depends on your goals, time horizon and ability to take losses, and no general answer fits. Many investors are hurt more by selling at the bottom than by the decline itself. A written plan made in calm conditions helps. Consider professional advice for your situation.

Where this applies

How bear market is used

No single tool computes this one. The idea shapes how other figures get read. The DCA vs. Lump Sum Calculator is where it bears most directly, and the rest of the calculators below are where it also matters.

Definitions are checked against primary sources and carry a review date. They are educational reference, not financial, investment, tax or legal advice.

Related vocabulary

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