The dimensions of fitted sheets for California king beds are 72 inches wide by 84 inches long. Flat sheets for this bed size measure 108 inches by 102 inches.
While flat sheets for king and California king have the same dimensions and can be easily interchanged, the fitted size differs. For a regular king-sized bed, the fitted sheet measures 76 inches by 80 inches, reflecting the extra 4 inches in width of the king as well as the fact that it is 4 inches shorter than the California king bed. Most comforters for the two-bed sizes are also interchangeable and measure 100 inches wide by 90 inches long.