The first step in selecting a rug is determining how big it needs to be. A good rule of thumb is to choose a rug that is at least two feet longer and two feet wider than the biggest piece of furniture in your room. This will allow you to see some of the design and pattern in the rug while still being able to walk around comfortably without tripping over it. 

Another thing you have to do is measure the width of your room. This will help you determine what size rug will fit best in it. If the width of your space is less than 6 feet, then you should opt for a smaller-sized rug. However, if your room's width is more than 6 feet wide, choose an oversized one instead.