Aside from historical trivia, the typical size of a dining room in the United States is 14 by 16 feet. Most "large" dining rooms are 14 by 18 feet in size to accommodate a formal table, seats, and a hutch. According to Homewyse.com, the average dining room is 200 square feet. A small dining room might be 100 square feet while a large one could be 400 square feet. The best way to determine if this size will work for you is to take into account the amount of space available and the size of your family. If you have little ones then a smaller room would be ideal so that you don't end up with too many guests in there at once. If you have an older home or just want more space then go for it! A larger room would allow you to host more people without feeling cramped. There's no right or wrong answer here but keep in mind that bigger isn't always better. If you need more space then don't worry about size alone; look at other options like modular tables or sectional furniture as well.