Are you referring to the TFP companion app "Pool Math?" I haven't checked lately, but it used to be free for some features and an in-app purchase to get the full version. Maybe they eliminated the free option? I don't know, but if you've posted 65 times I presume you've gotten some help of value. The app and becoming a paid member to this site is what makes all that help possible, and is the best way to show appreciation for all the effort others have expended for you... Just sayin'...