Question: what is the difference between a california king and a regular king mattress?
Answer: The biggest difference between a king size bed and a California king bed is that one bed is shorter and wider, while the other is longer and narrower. A king size bed is 76 inches wide and 80 inches long. A California king is just a few inches narrower than a king bed at 72 inches wide, but it's longer at 84 inches.