How to interpret the VIX
What the VIX actually measures, how to read its level vs realised volatility, the regimes that matter, and why the slope of the VIX curve often tells you more than the spot number.
The VIX measures the S&P 500's implied volatility over the next 30 days. Below 14: complacency. 14-20: normal. 20-30: stress. 30+: crisis. The level matters less than the direction.
The VIX is a calculation on top of S&P 500 options. Strip away the maths and it answers one question: how much movement is the options market pricing in for the next 30 days, annualised. A VIX of 15 means the market is implying about 15% annualised volatility, which translates to a daily move of roughly 0.9% in either direction.
There are four practical regimes. Below 14 is complacency: low priced vol, narrow daily ranges, trend-followers in heaven. 14 to 20 is normal: priced vol roughly matches realised. 20 to 30 is stress: something is making people pay up for protection. Above 30 is crisis: the level no longer matters, only the rate of change does.
The most common mistake is reading the VIX in isolation. The signal is comparing implied (VIX) to realised — the actual standard deviation of the last 20 days of S&P returns. When implied is higher than realised, options are expensive; sellers are paid. When implied is lower than realised, options are cheap and the market is underpricing risk.
The VIX curve is the second-order signal. Short-dated VIX (VIX9D) above 30-day VIX (the regular VIX) is backwardation: short-term panic. The opposite, contango, is the normal shape. Backwardation almost always means a near-term event is being feared; whether to fade it depends on whether the event is real.
You can see live VIX on /ticker/^VIX or in the Fear & Greed composite on the home page.
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