Measure the height of the dining table from the floor to the bottom of the table. A comfortable table height is between 28 and 28.5 inches. If the table has an apron on the underside (a support piece that extends between the table legs), the distance between the floor and the bottom edge of the apron should be between 24.5 to 25 inches.
Allow at least 24 inches of dining space along the table for each place setting, although most dining chairs are approximately 20 inches wide. If you have an oval dining table, you will be able to fit more diners around the table than if you have a rectangular dining table. This is because you can often squeeze an extra chair or two in around the curves, while, due to its corners, doing the same with a rectangle can be difficult.
Measure the dining chairs. Dining chairs are usually 17.5 to 18 inches high from the seat to the floor. The most comfortable distance between the bottom of the table and the top of the chair is about 6 or 7 inches (allowing for legroom). Therefore, make sure the distance between bottom of the table (or the apron) and the top of the chair is not less than 6 to 7 inches.