What the fear index really is
The VIX, often called the fear index, is a volatility index calculated and published by Cboe, the Chicago options exchange, from S&P 500 index option prices. Options get more expensive when prices look likely to swing widely, so working backwards from option prices tells you how much market participants expect the index to move over roughly the next 30 days. The value is shown as an annualized percentage. In other words, the VIX does not say whether stocks will rise or fall; it puts a number on how big the moves are expected to be. It earned its nickname because demand for downside protection rises when investors are nervous, which tends to push it up.
What you see next to an index chart
Put a VIX chart under an S&P 500 chart and a few features stand out. They are tendencies, not rules.
- The VIX often shoots up quickly when the index falls sharply
- When the index rises slowly, the VIX often moves quietly at low levels
- Rather than trending one way, the VIX tends to spike and then settle back again
- There are days when the index and the VIX both rise, so they do not always move in opposite directions
How to read high and low values
Rules of thumb such as above a certain level means fear and below it means calm circulate widely, but fixed lines like that mean different things in different periods and market conditions, so they make a poor basis. Looking at relative position is more useful for reading charts. That means checking where today's value sits among the past year's values, how fast it has changed over the last few days, and what the index looked like over the same period. The same value can describe completely different scenes: a sudden jump after a long quiet stretch, or a descent from a high level.
Common misreadings
The name fear index invites plenty of misreadings. Sorting them out before you look at the chart keeps your interpretation calm.
- A high VIX means a rebound is coming: there have been periods when it stayed high while the index kept falling
- A low VIX means it is safe: it only means expected volatility is low; it does not prevent future events
- You can buy and sell the VIX directly: the index itself is not tradable, and related futures and products can move differently from it
- It tells you the risk of individual stocks: it reflects expectations for the S&P 500 as a whole, and each stock has its own story
Korean stocks and crypto
Korea has a KOSPI 200 volatility index calculated from KOSPI 200 option prices, so you can view expected volatility in the Korean market the same way. Before the Korean market opens on the day after a rough US session, the overnight change in the VIX is one of several references for gauging the mood. The fear and greed index commonly seen in crypto has a similar name but a different method. It is not derived from option prices; it blends several measures such as price swings, volume and public interest into a score, so it should not be compared with the VIX on the same scale.
What to check on the chart alongside it
When you look at the VIX, the surrounding picture matters more than the single number. Check how far the index has fallen from its high, whether the decline was fast or gradual, and whether volume rose. How other assets such as Treasury yields and the dollar moved on the same day also offers clues. The VIX can also rise and fall around scheduled events such as economic data releases and earnings reports, so checking the calendar makes it easier to understand why it moved.
Check it with this site's live tools
The world markets overview shows the VIX on one screen with major indexes, exchange rates and Treasury yields, and tells you where the current value sits among the past year's daily closes. Read it by that relative position rather than by a fixed threshold. Use the index drawdown and recovery tool to find periods when the S&P 500 fell sharply, and the stock comparison tool to compare the volatility and maximum drawdown of several indexes, to see what periods of high volatility looked like. Prices may be delayed.
Things to keep in mind
This guide explains what the VIX is and how to read it alongside stock charts; it is educational material, not investment advice. Do not read it as saying that any particular VIX level can serve as a signal to buy or sell. Volatility-linked futures and products have complex structures, can move differently from the index and can lead to large losses. Check how the index is calculated and the terms of related products in the official information from the index provider, the exchange and your broker.
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