The size of the rug that should go under a king bed depends on the size of the bed and the desired look. Here are some recommendations from experts:

• A 12-foot by 15-foot rug works best for a California king-size bed. The bed frame, nightstands, and bench can all fit on top while still looking proportional.

• An 8 x 10 rug is considered the minimum rug size for king-size beds because they have just enough length and width to frame the bed without protruding too much.

• For a standard king bed frame that is sized at 76 inches wide, a rug somewhere between 112-124 inches (about 10ft wide) is recommended.

Ultimately, the size of the rug should be based on personal preference and the size of the room. It is important to measure the room and the bed before purchasing a rug to ensure the right fit.