@drcruz You may already have gotten the answer you needed, but the first thought I had when I saw your question was this: When I joined SO around 18 months ago, a member named Dustin posted the RV charts each week on the forums. His charts displayed RV of combined put + call double calendar and you had to divide that in half to know the price for either calendar on its own. For example, if his chart showed RV of 1.5%, we would divide it in half and assume the put calendar was 0.75% and the call calendar was 0.75%. (All this info was in the threads I read when I first joined, but I haven't checked to see if those threads are still out there) Nowadays, Dustin doesn't post his charts anymore and most people are going to either volatilityhq.com or art-of.trading to get their RV data. Each of those sites shows data for put calendars and data for call calendars separately, so you don't have to worry about dividing the RV number in half anymore.