A double bed, also called a full-size bed, is 53 inches wide, about 15 inches wider than a twin. At only 75 inches long, double beds are best suited for individuals under 5 feet 5 inches tall. Taller people and couples often fit better on a queen-size or king-size bed.
Double beds are increasingly popular choices for first beds for children and teens. The extra space provides children room to move around and a comfortable space to relax with a book at bedtime. If the width of the room does not allow for a full-size bed, a twin extra-long bed might be a good alternative, according to the Better Sleep Council.