Generally you want three feet of walking space around the table with the chairs not in use (slid under the table). Also, most dining tables come in one of the basic shapes: rectangular, square, and round. The width and depth of the table vary based on the shape. Rectangular dining room tables are the most common shape, and generally range between 36” and 48” wide. In order to seat at least four to eight people, the dining table should be 48” to 90” long. The rule of thumb is allow 24" to 30” of space per seat at your dining table. Square and round tables are better suited for smaller groups; popular sizes range from 42” to 54” and may seat four to six people.