VIX Fear Index: The S&P 500's Volatility Gauge, Live
The VIX — the 30-day implied volatility the options market is pricing into the S&P 500, Wall Street's “fear gauge” — charted against SPY with regime fear zones, a 16-year percentile, and the implied-vs-realized spread that shows whether options are pricing more fear than the market is delivering.
Today's reading
On July 31, 2026, the VIX closed at 16.0 — in the Normal zone and the 43rd percentile of the last 16 years (down from 17.1 the prior session). The S&P 500's trailing one-month realized volatility was 12.4%, leaving an implied-vs-realized spread of 3.6 points — options are pricing in more fear than the market is delivering.
Sources, methodology & freshnessLast updated 2026-07-31 · Open ↓Close ↑
43th percentile of the last 16 years — implies a one-month move of about 4.6% in the S&P 500.
VIX vs the S&P 500
The fear gauge against the market. The VIX spikes when stocks fall and bleeds lower as they grind higher — the clearest picture of how fear and price move in opposition.
Implied vs realized volatility
The VIX (implied, forward-looking) against the S&P 500's trailing 21-day realized volatility (what it actually did). The gap is the volatility risk premium: VIX above realized means options are pricing more fear than the market is delivering — the normal state. When realized overtakes the VIX, real movement is outrunning what was priced.
Fear zones & historical range
The VIX over its regime bands — Calm, Normal, Elevated, High, and Panic. Today's close sits in the Normal zone, the 43th percentile of the last 16 years.
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How VIX Fear Index Works
- 1Track the VIX against the S&P 500The Cboe Volatility Index (VIX) measures the 30-day implied volatility the options market is pricing into the S&P 500. We chart it daily against SPY so the inverse relationship is plain: the VIX spikes when stocks fall and bleeds lower as they grind up. The level itself is an annualized expected move — a VIX of 16 implies the market expects the S&P to move about 16% over the next year, or roughly 4.6% over the next month.
- 2Place today’s reading in fear zonesA raw VIX number means little without context. We bucket it into regimes — Calm (under 15), Normal (15–20), Elevated (20–30), High (30–40), and Panic (over 40) — and compute where today sits as a percentile of the last 16 years, so you can see at a glance whether fear is historically cheap or stretched.
- 3Compare implied fear with realized movementWe compute the S&P 500’s trailing 21-day realized volatility — how much it has actually moved — and chart it against the VIX. The gap between them is the volatility risk premium: when the VIX sits well above realized vol, options are pricing in more fear than the market is delivering (the normal state); when realized overtakes the VIX, real movement is outrunning what was priced.
- 4Publish a dated, plain-English readingEvery update is stamped to its session — the VIX level, its zone, its percentile, the one-day change, and the implied-vs-realized spread. Volatility extremes are context for risk, not standalone timing signals.