Twin Mattress Dimensions & Measurements Width & Length

Twin Mattress Dimensions Are 39″ X 75″

The Twin mattress dimensions are the smallest size available, not including toddler and infant size. This makes it the perfect size mattress for a young child no longer using a toddler mattress, growing adolescence, and/or single adults saving on room space. Due to its smaller size width and length, it is often used in dorm rooms and other spaces where more than one bed is in place. This makes it a lot less cramped in the room, allowing more space for other furniture and objects. Twin mattress dimensions are smaller and typically geared towards a younger audience, so they are often more affordable than larger mattresses. When deciding on which mattress one should purchase, there are many things to consider. A few potential pros and cons are listed below.  How these pros and cons impact each individual is really based on personal preference.


  • Generally the cost of a twin size mattress is less than that of a larger size, though prices can vary greatly depending on the quality selected.
  • Gives parents with young children the opportunity to provide a mattress that suits their needs, and is not “too big”.
  • Can be a very great investment for those with a smaller amount of space to allow for their bed
  • The Twin mattress dimensions measure approximately 39 inches wide and 75 inches in length.   
  • Available in both high quality and lower quality models.
  • Many bed frames that accommodate multiple children fit one or more twin size mattresses.
  • Twin bunk beds can save even more space and be a “fun” sleeping environment for children.


  • Often the length of a Twin mattress is not great enough to comfortably fit a full sized adult.
  • Twin mattresses are not ideal for more than one person sleeping at a time.

Rest Right Mattress carries a number of different brands to name a few Nature’s Sleep, Glideaway, and iAdjust to help with your sleep.