A standard double bed, also called a full size bed, measures 53 to 54 inches wide and 75 inches long. Although a double mattress technically fits two adults, most people purchase them for a single person to use or for a guest room.
Double beds are most comfortable for individuals who are no taller than 5 feet 5 inches. Parents often choose double beds for their kids' bedrooms to give the kids extra sleeping space. For younger children, a double bed also gives the parents a place to lay down while reading books or tucking a child in before bedtime. Individuals who are sharing a bed with a partner typically choose a queen- or king-size bed.