A standard king bed measures 76 inches wide by 80 inches long (approximately 6 feet 4 inches wide and 6 feet 8 inches long), providing a surface area of about 6,080 square inches (42.22 square feet)

. This size is wider than a queen bed, which measures 60 by 80 inches, and slightly different in dimensions compared to a California king, which is longer but narrower at 72 by 84 inches

. King beds are designed to offer ample sleeping space for couples, children, or pets, making them ideal for larger bedrooms, typically recommended to be at least 10 by 12 feet to accommodate the bed comfortably

. The mattress thickness usually ranges from 9 to 12 inches

. In summary, a king bed is 76" x 80" (193 cm x 203 cm), making it one of the largest standard mattress sizes available, favored for its spacious comfort