Size Comparisons and Dimensions. 1  California or Cal king bed is 72 wide x 84 long. 2  4 inches longer than the King Size Bed. 3  Longest bed available.  Width per person is 36 1  inches. Standard or eastern king bed is 76 wide x 80 long.  4 inches wider than the California king 1  bed. Width per person is 38 inches.