There are a lot of traditional rules when it comes to the correct rug size, but most designers today will encourage you to break those rules. It's your call, but keep in mind what is both functional and aesthetically pleasing. Look to your furniture to determine the size; in a living room, an area rug should offer plenty of coverage from one sofa to the next. After all, if there are too many gaps, it's small size will be easy to notice.

You should also keep in mind architectural cues. A rug near the front door is often just large enough to slightly surpass the door frame, while a narrow hallway requires an equally narrow runner rug. In the end, your space and furniture will dictate the size more than anything.