The full-sized mattress offers a compelling option for smaller couples, young adults, or even children.
The dimensions of a full-size bed, also called a "double" bed, are larger than a twin but smaller than a queen. Relative to a standard twin bed, a full-size is the same length but offers 15 inches more width. Relative to a queen bed, the full-size is 6 inches narrower as well as 5 inches shorter.
For many years, the full-sized mattress was the most commonly purchased mattress for adults. In recent years though, as the population has become taller and heavier and homes and bedrooms have become bigger, the popularity of the full size has been overtaken by that of larger of queen- and king-sized options. That said, the full-sized mattress, also called a "double" bed, remains one of the most popular available mattress sizes. For adults, the full-size bed is a particularly good choice for people whose bedrooms are not large enough to accommodate a queen mattress, who have existing bedroom furniture that requires a full-size mattress, or who simply prefer the look and feel of a smaller bed.
Relative to a twin mattress, the full-sized mattress is a popular choice for teenagers, many of whom may outgrow a twin mattress once they grow taller than 5'9" tall. Full beds are also an increasingly popular choice for kids, since the extra space allows a parent to more easily read in bed with the child or otherwise help the child fall asleep.
Standard Full beds are 54” wide and 75” long -- big enough for two small or medium sized adults, but rather small for two larger adults.
Full Extra Long mattresses are available for taller folks, which are the same width (54" wide) but add 5 inches in additional length (making them 80" long). Because this size is less common than the standard Full size, your choice of types and styles may be restricted, and it may be more difficult to find sheets and other bedding to fit it.
Three-Quarter (3/4) beds are a bit narrower than a full-size bed (48" wide), but the same length (75" long). The three-quarter size is no longer common, but is still available if you need it to fit an antique or heirloom bed. Due to the historic popularity of this size, many classic antique iron beds require a 3/4 size mattress. As compared to the "Super Single" size, which also falls in between twin and full, a 3/4 bed is the same width but is 9 inches shorter.