So, although there are no hard and fast rules that apply to every quilt every time, there are some guidelines that are fairly standard. And of course, there's an exception to every rule. Here are approximate dimensions for quilt sizes. If I can get within an inch or so of the width and length, I'm happy.
Any size can qualify for a wallhanging.
This size can depend on whether the quilt will be used in a crib. There are several factors that can influence your decision on the quilt size. Perhaps the design of the quilt hampers your ability to get the exact size you want. If the blocks are meant to be set on point, they sometimes look silly and out of place if they aren't. Never let the size of the quilt interfere with your original design.