The "daily Call" From Option Alpha: Options Trading | Stock Options | Stock Trading | Trading Online

Hey everyone. This is Kirk here again from Option Alpha and welcome back to the daily call. Today, we’re going to be answering the question, “How is the CBOE VIX calculated?” The VIX is actually a measure of 30-day expected volatility for the S&P 500. You could basically say that the VIX is a gauge for judging the implied or the expected movement in the S&P 500 over the next 30 days. And so, what they do is they have a bunch of formulas and ways that they do it which they have on their site, but it basically boils down to looking at at the money and out of the money puts and calls that are more than 23 days from expiration and less than 37 days from expiration for the SPX. And so, what they do is they take all of the AM settlement SPX options along with any PM settlement weekly options that expire and they basically weight this to somewhere around 30 days of expected volatility. And so, what happens is that each week, the contracts and the calculations roll to the next maturity. As one week falls off,