What Is the VIX? The Stock Market’s “Fear Gauge” Explained
What the VIX measures, what high and low readings mean, why it spikes during sell-offs, and what long-term investors should (and shouldn’t) do when volatility jumps.
When markets get rough, you'll hear that "the VIX is spiking." Nicknamed Wall Street's fear gauge, the VIX is a quick way to see how nervous investors are. Here is what it actually measures and what it means for your money.
What is the VIX?
The Cboe Volatility Index (VIX) estimates how much the S&P 500 is expected to move over the next 30 days. It is calculated in real time from the prices of S&P 500 index options, which are contracts investors use to bet on or protect against market moves.
When investors rush to buy protection against a drop, option prices rise, and so does the VIX. That is why it tends to jump when stocks fall.
How to read the number
The VIX is expressed as an annualized percentage. A VIX of 20 means options are pricing in S&P 500 moves of about 20% a year, or roughly ±5.8% over the next month (20 divided by the square root of 12).
| VIX level | What it usually signals |
|---|---|
| Below 15 | Calm, steady markets |
| 15–25 | Normal range; its long-term average is roughly 19–20 |
| 25–35 | Elevated fear and bigger daily swings |
| Above 35–40 | Market stress or panic |
For context, the VIX closed above 80 at the depths of the 2008 financial crisis and again in March 2020 when the pandemic hit markets.
Why the VIX usually moves opposite to stocks
Stocks tend to fall faster than they rise. Sharp sell-offs create urgency, and investors pay up for downside protection. So most of the time:
- Stocks down sharply → VIX up
- Stocks rising steadily → VIX down
This relationship isn't perfect, but it is strong enough that the VIX is widely used as a real-time sentiment check.
What the VIX doesn't tell you
- Direction. A high VIX means big moves are expected, not necessarily down moves.
- Timing. It can stay high or low for long periods.
- Individual stocks. It measures expected volatility of the S&P 500 as a whole.
Some contrarian investors view very high VIX readings as a sign that fear may be peaking, but that is an observation, not a reliable timing tool.
Can you invest in the VIX?
Not directly. There are futures, options and exchange-traded products linked to VIX futures, but they are complex and generally designed for short-term trading. Many lose value over time because of how futures contracts roll, even when the VIX itself ends up roughly where it started. They are not a buy-and-hold investment, and most long-term investors don't need them.
What should long-term investors do when the VIX spikes?
- Don't panic-sell. Volatility spikes often happen near market lows. Selling after a big drop can lock in losses and cause you to miss the recovery.
- Keep investing on schedule. With dollar-cost averaging, volatile markets let your regular contribution buy more shares.
- Check that your cash is in place. An emergency fund means you won't be forced to sell investments at a bad time.
- Revisit your mix, calmly. If a drop kept you up at night, your portfolio may have more stock than you are comfortable with. Adjust gradually, ideally after markets settle.
Other things that move volatility
Scheduled economic events often move the market and the VIX:
- Federal Reserve (FOMC) interest rate decisions
- Consumer Price Index (CPI) inflation reports
- The monthly jobs report (usually the first Friday of the month)
- Corporate earnings season, especially results from the largest companies in the S&P 500
Key takeaways
- The VIX measures expected S&P 500 volatility over the next 30 days, based on option prices.
- Readings around 19–20 are average; above 30 signals significant fear.
- It usually rises when stocks fall, but it doesn't predict direction.
- VIX-linked products are complex trading tools, not long-term investments.
Free download
Free 50/30/20 Budget Spreadsheet
Enter your take-home pay and expenses, and it splits your money into needs, wants and savings automatically.
- Works in Excel, Google Sheets and Numbers
- Built-in targets and "left to assign" tracker
- Plus short, practical money tips by email
We write practical, fact-checked guides on money and markets for U.S. readers. How we research and fact-check.
