A standard king size bed, also referred to as an Eastern king size bed, is 76 inches wide and 80 inches long. A California king size bed is 72 inches wide and 84 inches long, providing a longer length suitable for taller people.
A king size bed comfortably accommodates two adults and provides each of its occupants with the greatest amount of sleeping space. While a queen size bed also holds two adults, it is 80 inches long and only 60 inches wide. A twin bed, sometimes called a single bed, is 39 inches wide and 75 inches long and is made to accommodate a single occupant. It is possible to push two twin beds together to create a sleeping space approximately equal to that provided by a king size bed.