Dishwasher dimensions are listed on the product specifications chart, often displayed at the store, on the dishwasher packaging and in the owner's manual. The specifications list the height, width and depth of the dishwasher and the minimum size of the cutout for the unit.
A standard under-counter dishwasher is usually 24 inches wide, 35 inches high and 24 inches deep. The exact measurement may vary slightly from one brand to the next, so checking the product specifications is important to ensure the dishwasher fits.
Many brands offer compact, counter-top or portable dishwasher units. The dimensions on these models are typically smaller than the standard size, with a width of about 18 inches.