What are Twin Size Mattress Dimensions?

What are Twin Size Mattress Dimensions?

April 22, 2022

Author: Lisah

How big is a Twin Size Bed? Did you know that besides a crib mattress, the twin mattress is the smallest size bed available on the market? Even though it is the smallest, it can be used for many situations. If you are on a tight budget, under 6ft tall and sleep alone, if you have a child that has outgrown their crib and they aren’t quite ready for a full size bed, if you have very limited space like a studio apartment, if you are moving into a dorm, if you have a daybed or bunk bed, this bed size is a great option for you.

Twin size mattresses are built to industry standard dimensions. Twin beds are approximately 38 inches wide by 74.5 inches long. Bed frames, sheets, comforters, etc. are easy to find for this size bed. If you are on a the taller side or just want a little more foot room and have one of the scenarios mentioned above you might want to consider the twin’s counter part, Twin XL. Twin XL’s are about 5 inches longer measuring 38×79.5. Use the table below to compare mattress sizes.

Width x Length

Standard Size

38″ x 74.5″


38″ x 79.5″

Twin XL

53″ x 74.5″


60″ x 79.5″


76″ x 79.5″


72″ x 83.5″

California King

Serta Twin Size Recommendations:

If you are on a budget, consider this compact mattress in a box option.

Looking for bunk bed or daybed mattress options? Consider this comfy mattress in a box.


If you’re an adult looking, check out this cooling, supportive option below.


National Sleep Foundation’s logo, name, materials and/or insights used under license from NSF in exchange for Serta’s financial support of NSF’s sleep research and educational activities.

The Consumer’s Digest Best Buy seal, editorial review text, references to the editorial review, and Consumer’s Digest Best Buy rating are registered certification marks and trademarks of Consumers Digest Communications, LLC used under paid license. For award information, visit www.consumersdigest.com.



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