Loaf pan dimensions represent the dimensions of the length, width, and height of the pan, usually in inches. They are often described and displayed as length x width actually, where 9 inches is the length and 5 inches is the height. These dimensions are measured from the inner edge to the inner edge. 9x5 is a fairly standard loaf pan and it may also be referred to as a 1-pound loaf, referring to the weight of the ingredients that go into a bread loaf that fits this size pan.