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by | Dec 22, 2013 | Publications. VIX is a measure of expected volatility calculated as 100 times the square root of the expected 30-day variance (var) of the S&P 500 rate of return. The variance is annualized and VIX expresses volatility in percentage points.
How is VIXâs value established? The VIX is a computed index, but unlike indexes such as the Dow Jones Industrial Average or the S&P 500 itâs not computed based on stock prices. Instead itâs based on option prices. Specifically the prices of options on the S&P 500 index (ticker SPX).