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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.
Calculation Instructions: 1  Select Gender - Choose male for boys and female for girls. 2  Measure Date - Enter the day the measurement was taken. 3  Due Date - Enter the original due date. Note, this calculator assume 280 days between first day of last menstrual period (LMP) to birth. 4  Enter Head Circumference - distance around the child's head.