average king size bed
Average Dimensions of a King Size Bed. The average dimensions of a king size bed are 76 x 80 inches. The California king on the other hand, is 84 inches long and 72 inches wide. The grand king measures 80â x 98â (W x L). In standard king bed, the sleeping area is 38â³ x 80â; for the California king it is 36â³ x 84 and for the grand king it is 40â³ x 98â.