I believe that he's referring to the diameter in inches, which is how Lodge sizes theirs. There are normal and "deep" in some diameters. A 12" is a handy size for what you want, and the normal one is fine - no need for a deep for cobbler. A 14" is rather large. See the Lodge site for capacities in quarts. We have both capacities of 12" (family of 6); my brother has a 14" and it is huge to my eyes. As our kids grow up, I can see a 10" better serving us...

HTH,

Tom