The short answer
The VIX is a live index, published by the CBOE, that measures how much movement the market expects from the S&P 500 over the next 30 days. It is calculated from the prices traders are paying for S&P 500 (SPX) options, so it reads as a real-time gauge of expected volatility — which is why it spikes when markets fall and drifts lower when they are calm. It is not a stock, and it is not something you can buy directly; see what the VIX level today means for how to read the current number.
Definition
The VIX (CBOE Volatility Index) measures the market's expectation of 30-day volatility in the S&P 500 index. Created by the Chicago Board Options Exchange, it's calculated from S&P 500 index options prices and represents expected annualized volatility.
When VIX reads 20, it suggests the market expects the S&P 500 to move approximately 20% annually, or roughly 5.77% over the next 30 days (20% ÷ √12).
Why "Fear Gauge"?
VIX earned its "fear gauge" nickname because it typically spikes during market selloffs. This inverse relationship with stocks occurs because:
- Investors buy put options for protection during uncertainty
- Increased options demand drives up implied volatility
- Market drops tend to be sharper than rises
- Volatility clusters during crisis periods
VIX Level Interpretation
| VIX Level | Market State | Historical Frequency | Typical Action |
|---|---|---|---|
| Below 12 | Extreme Complacency | 8.6% of days | Very low expected swings |
| 12-20 | Normal Conditions | 54.5% of days | The most common range |
| 20-30 | Elevated Uncertainty | 29.0% of days | Larger daily swings expected |
| 30-40 | High Fear | 5.7% of days | Stress in the options market |
| Above 40 | Extreme Fear/Crisis | 2.2% of days | Rare, associated with market crises |
Frequencies are the share of daily closes from 1990 to October 2026, calculated from Cboe data. See the VIX historical data for the full record.
Key Characteristics
Mean Reversion
VIX exhibits strong mean reversion. Extreme readings rarely persist. Since 1990 a run of closes at 40 or higher has typically lasted about two sessions, although the 2008 crisis produced a run of 63.
Volatility Clustering
High volatility begets high volatility. Once volatility rises, it tends to stay elevated for a while. Multiple spikes often occur in succession during unstable periods.
Asymmetric Spikes
VIX rises faster than it falls. Spikes from 15 to 40 can occur in days, while declines from 40 to 15 typically take weeks or months.
What VIX Doesn't Measure
Common misconceptions about VIX:
- Not actual volatility: VIX measures expected, not realized volatility
- Not directional: High VIX doesn't predict market direction
- Not a stock: You can't buy VIX directly
- Not a forecast of direction: VIX reflects current options prices, not future events
What does the VIX number mean?
The VIX is quoted in annualized percentage points, so it needs a small conversion before it describes a day or a month. Divide by 16 for a typical one-day S&P 500 move, and by about 3.5 for a one-month move. That is one standard deviation, so moves of that size or smaller are expected roughly two times out of three.
| VIX | Typical daily move | Typical monthly move |
|---|---|---|
| 12 | ±0.8% | ±3.5% |
| 20 | ±1.3% | ±5.8% |
| 30 | ±1.9% | ±8.7% |
| 40 | ±2.5% | ±11.5% |
Try any level in the VIX expected move calculator.
Why does the VIX go up when stocks fall?
Since 1990 the VIX and the S&P 500 have moved in opposite directions on about 78% of trading days. When the index drops, investors pay more for put options, and those higher option prices feed directly into the VIX. On days the S&P 500 fell 2% to 3%, the VIX rose 97% of the time, by close to 3 points on average. See VIX vs S&P 500 for the full table.
Is the VIX a stock?
No. This is the single most common misunderstanding, and it is worth being precise about. A stock is a claim on a company that you can buy and hold; the VIX is a number the CBOE recalculates every few seconds from a strip of SPX option prices. There are no VIX shares, no VIX float, and no VIX dividend. When a quote screen lists the VIX next to tickers, it is showing a calculated index, not a security.
That distinction has practical consequences. Because nobody can hold the index, there is no arbitrage tying it to any tradable price, which is why VIX futures routinely trade well away from the spot reading. Every product marketed as “the VIX” — VXX, UVXY, VIXY, SVXY — actually holds futures contracts, and that is the source of the decay those products suffer over time.
People searching for “VIX stock” usually want one of two things: the current level, which you can read on the live VIX chart, or a way to get exposure, which we cover in can you buy the VIX?
Trading VIX
While you can't trade spot VIX, several products provide exposure:
- VIX Futures: Direct exposure to expected future VIX levels
- VIX Options: Calls for volatility spikes, puts for mean reversion
- VIX ETFs/ETNs: VXX, UVXY track VIX futures (with decay)
- Inverse Products: SVXY profits from declining volatility
Historical Context
Notable VIX levels throughout history:
- 89.53: October 24, 2008 (highest intraday reading, Financial Crisis)
- 82.69: March 16, 2020 (highest close, COVID-19 pandemic)
- 52.33: April 8, 2025 (highest close of the tariff selloff)
- 48.00: August 8, 2011 (U.S. debt downgrade)
- 9.14: November 3, 2017 (lowest close; the intraday low is 8.56)
- 19.42 / 17.56: Average and median close since 1990
Practical Applications
Portfolio Hedging
VIX products are used to hedge equity portfolios, because they tend to rise when stocks fall sharply. The hedge has a cost: long volatility loses money in calm markets. See how to hedge with the VIX.
Market Timing
Extreme readings have often come near market lows, but a high VIX is not a timing signal on its own. See is a high VIX a buy signal?
Volatility Trading
Traders use VIX futures, options and ETFs to take views on volatility itself. These products behave very differently from the index. See how to trade the VIX.