You'll want to consider the size of the bed, the dimensions of your room, and the positioning of the furniture in the space. The most common size for a king bed is a 9-by-12 rug.

Queen mattress . A queen mattress is one of the most common bed sizes available today. It measures 60 inches wide by 80 inches long, making it as long as a twin XL and king mattress.However, it's ...