Here are a few points you should keep in mind while choosing a comfortable dining chair, 1. When choosing armless chairs, make sure the chairs are at least 22 inches wide and 24 inches deep. Avoid all chairs which are smaller than 17 inches by 20 inches. 2. You have to make sure there are 12 inches between the top of the dining chair and the bottom of the table. 3. Upholstered and padded chairs tend to be more comfortable.