Guide · Markets
What Is the VIX? Understanding Wall Street's 'Fear Gauge'
The VIX gets called the market's 'fear index' in every downturn headline. Here's what it actually measures — and what it doesn't.
The VIX — officially the CBOE Volatility Index — measures how much price movement options traders expect in the S&P 500 over the next 30 days, calculated from the prices of S&P 500 options themselves. It doesn't measure past volatility or predict direction; it measures the market's current best guess at how turbulent the next month is likely to be, priced in real time by people putting real money behind that guess.
A low VIX means options are cheap, because sellers aren't demanding much compensation for the risk of a big move — typically a sign of a calm, grinding market. A high VIX means options are expensive, because sellers want more compensation for taking on risk that a big move is coming — which is why the VIX tends to spike sharply during sudden selloffs and stays elevated until markets stabilize.
The 'fear gauge' nickname is accurate but incomplete: the VIX reflects expected magnitude of movement, not direction. A VIX spike doesn't tell you whether the market is about to crash or rip higher — sharp rallies can push it up too — it just tells you options traders are pricing in a bigger move than usual, in either direction.
Because the VIX is a derived index rather than a directly tradable asset, most traders get exposure through futures-linked ETPs instead — instruments worth understanding on Trade2Spike's Markets pages before treating a VIX headline as a signal on its own.