A king mattress is 76 inches wide. A 9 x 12 ft rug under the lower two-thirds leaves about 18 to 24 inches showing on each side, the same comfortable border a queen gets from an 8 x 10.
| Room | Rug | Layout |
|---|---|---|
| Most bedrooms | 9 x 12 ft | Sideways, under the lower two-thirds of the bed |
| Large bedroom | 10 x 14 ft | Under the bed and the nightstands |
| Tighter room | 8 x 10 ft | Sideways, with less rug showing on each side |
Leave 12 to 18 inches of floor between the rug and the walls. Try your own room in the rug size calculator.
Sources
- Nebraska Furniture Mart: rug buying guide (8 x 10 for a queen, 9 x 12 for a king; 18 to 24 in beyond the bed)
- Room & Board: how to choose a rug size (24 in around a dining table; 18 in to the wall)
Sources last checked 1 November 2026.
