The standard size dishwasher is approximately 24 inches wide by 35 inches high by 24 inches deep. However, dimensions vary slightly based on dishwasher type, which should be considered before installation.
A standard-sized dishwasher can fit 12 place settings and is recommended for a family of four or more. For large families and spacious kitchens, oversized 30-inch wide dishwashers are available that hold up to 20 place settings. A variety of space-saving models are available for apartments and smaller kitchens. A compact 18-inch dishwasher, for example, fits about eight place settings and is typically adequate for couples and small families.