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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.
1 The volatility of the S&P 500 index is published and can even be traded or spread bet. 2  The VIX index is 'calculated' as a positive percentage and represents the expected volatility of the S&P 500 index over the next 30 days. 3  i.e. the Vix Index measures implied volatility of options on the S&P 500.