A1C Chart

I was wondering if anyone has a link for an accurate A1C:BG chart. I've searched on google and I've found a couple, but they all differ. For example, one says that the average BG for 7.0 is 172, but another says 150. I've been keeping track of mine for about 3 months on an app for my iPhone called WaveSense (it has helped so much), and my 90-day average is 169. I'm going to my endo in a couple days and I'll find out my A1C then, but I'm so anxious and I kind of want to figure it out for myself first! Thank you!