Dishwasher sizes (or capacities) are measured by the number of place settings and serving pieces they can hold at a time. A standard size dishwasher is defined as having a capacity greater than or equal to eight place settings and six serving pieces. A compact dishwasher is defined as being able to fit less than eight place settings and six serving pieces. Both standard and compact models are eligible for ENERGY STAR qualification. The typical dishwasher cavity is 24, and that is the size of most dishwasher models. Several manufacturers offer 18 models, which are very popular in smaller kitchens and apartments. The majority of the 18 models on the market can fit eight place settings and six serving pieces, and are therefore considered standard sized dishwashers.