There is no standard microwave size, but typical countertop microwaves measure 24 inches in width, 14 inches in height, and 16 inches in depth. A microwave this size has approximately 1.5 cubit feet capacity.
The sizes of microwaves vary greatly depending on where they are designed to be installed. Microwaves placed over a range typically measure 30 to 36 inches in width, 14 to 18 inches in height, and 15 to 17 inches in depth. They can also have up to 2.2 cubit feet capacity. Microwave drawers are usually smaller, with a capacity of only 1.9 cubic feet. Microwaves range in weight from 32 to 100 pounds.