California King mattresses measure 72" x 84", making them the longest standard mattress size available. The narrower width compared to standard King mattresses works particularly well in longer, narrower bedroom layouts while providing maximum length for taller body types. Ideal for individuals over 6 feet tall or couples who need extra legroom, Cal King beds fit best in spacious master bedrooms at least 12' x 12'. Browse our entire selection of California King-sized mattresses below.