what size is a king bed.
A standard king-size mattress is 76 inches wide by 80 inches long. A California king mattress is longer by 4 inches (84 inches long), but narrower by 4 inches (72 inches wide). King-size mattresses range in depth from about 9 inches for memory-foam or low-end innerspring models, to 17 inches or more for deluxe pillow-top models.