When it comes to king-sized beds, the most common rug sizes are 8x10 feet, 9x12 feet, and 12x15 feet. Each size offers a different look and feel, so it's important to consider the overall layout of your bedroom before making a decision. The 8x10 Rug An 8x10 rug is a popular choice for king-sized beds, especially in smaller bedrooms. This size allows for a comfortable fit under the bed, extending beyond the sides and the foot of the bed. It provides a cozy area for your feet