Microwaves have historically come in two basic categories: standard over-the-range microwaves and countertop microwaves. Over-the-range microwaves are designed to fit nicely above your range and have standard 30" widths. Height-wise, they are typically between 16" and 18", and they generally offer a capacity in the 1.7 to 2.0 cubic foot range. Over-the-range microwaves are practically standard issue in most modern kitchens, and the cabinetry and layout in modern homes generally work well for these products.