When you see rugs hanging in a showroom, keep in mind that they look a lot bigger than when they are on the floor. Therefore, it can be tricky to guess the rug size you need just by looking at a room or a rug. You need to actually measure the size of the space, and know how much of the floor you want covered, as well as know which pieces of furniture you want placed on the area rug. This illustration should help you decide:
When it comes to putting an area rug in your dining room, make sure the rug is not too small for the room or for the entire dining table and chairs. Each chair should be able to be pulled out from under the table and still be comfortably on the rug. When chairs are tucked in there should be ample carpet around the chairs.