A compact microwave is the microwave that can be placed or installed in very less space. These are also referred to as small dimension microwaves. The size of a compact microwave can be between 15 to 19 inches in width and 10 to 11 inches in length. The compact microwaves can range between 600 watts to 1900 Watts. Depth of the space is measured with the door closed, and you have to make sure you have enough space for the door to fully open. If you want to buy a compact microwave, do check all over the web for a variety of available options to choose from.