What Size Is a 3/4 Width Bed?

A 3/4-width bed, also called a 3/4-size bed, is a common size for antique beds as well as modern beds designed for tight spaces such as recreational vehicles. While a full mattress and box spring set can be used on some types of 3/4 beds, the mattress best suited to this bed size measures 48 inches wide and 75 inches long.

Mattress Comparisons

  • A twin bed, also known as a single, is 39 inches wide and 75 inches long. The length of twins, 3.4 beds and full-size beds is the same, so they all take up the same amount of space from front to back.
  • A 3/4 bed measures 48 inches wide, 75 inches long in most cases -- the same length as a full or double bed. In rarer instances, a 3/4 bed may be only 72 inches long. The 3/4 term is a misnomer, as this bed really isn't proportionally 3/4 of any other bed size.
  • A full bed, also known as a double bed, measures 54 inches wide and 75 inches long.

Antique 3/4 Beds

While 3/4 mattresses may not be on display at your local mattress store, many manufacturers make them on a regular basis or will custom-make them to fit your bed frame. If you'd rather not deal with the time or expense involved in purchasing a specialty mattress and bedding to match, a regular full-size mattress and box spring set fits atop rather than in between the side rails and frames of many antique 3/4 bed designs.

Uses of Modern 3/4 Beds

Aside from serving as new mattresses for antique bed frames, 3/4 mattresses are also used in recreational vehicles, boat sleeping quarters, trucks and some pull-out sofa beds. If replacing the mattress for any smaller-than-typical sleeping area, measure the existing mattress or space for the mattress before purchasing a replacement. In some cases, the measurements may be an unusual size, requiring a custom-made mattress.