The number of dining room chairs you purchase is largely determined by the size of your table. A small table often includes four chairs, while a larger one will require six to eight seats. If you're starting from scratch and buying an entirely new dining room chair set, consider how many pieces you’ll actually use (do you throw a lot of parties or are you more of an intimate dinner type?), and how many your space will comfortably allow. It's also helpful to buy a few extra seats and keep them in storage in case you need to squeeze in a few extra people during a larger event.