Detailed Mattress Comparison

A twin XL mattress is long but narrow compared to a full size mattress. A twin XL is 5 inches longer than a full-size mattress whereas a full mattress is 16 inches wider than a twin XL mattress. A full size mattress is more versatile and offers more sleeping space for an individual, while a twin XL is better suited for tall teenagers and adults who like compact sleeping spaces. 

Before deciding between twin XL vs full mattresses, there are plenty of other considerations. To assist you in making the best decision, we’ve listed the difference as well as the benefits and drawbacks of a twin XL and a full mattress.

ParametersTwin XL MattressFull Mattress
IN:38″ X 80″ X 11”
FT:3.25 X 6.67 X 0.92
CM:99.06 X 203.2 X 27.94
IN:54” x 75” x 11”
FT:4.5 X 6.25 X 0.92
CM:137.16 X 190.5 X 27.94
Bed Size38 X 80 inches54 X 75 inches
Recommended Room size9 × 9 feet9 × 9.6 feet
Comfortably Fits
  • Growing teens
  • Adult
  • Adults
  • Single adult with a pet or a child
Twin XL vs Full Mattress Comparison with Dimensions

What is a Twin XL Size Mattress? 

A twin XL mattress is 38 inches wide and 80 inches long. It’s the same width as a standard twin-size mattress. The only difference between a twin and twin XL is in length – the latter is 5 inches longer. For tall sleepers, the extra inches provide more legroom. Twin beds, which are shorter than Twin XL, are used in children’s rooms and guest rooms, whereas twin XL beds are popular for dorm rooms and small apartments. 

A Twin XL is ideal for teens and adults who would choose a twin but need the extra length or legroom. Since twin XL memory foam mattresses are a popular option for bunk beds or children’s rooms, bedding accessories such as bed sheets, bed frames, and bed bases are widely available.


  • Suitable for teenagers or single adults
  • Additional 5 inches in length compared to a full mattress
  • Ideal for confined spaces
  • Cheaper than a full size mattress


  • Only meant for single sleepers
  • Can feel cramped for most adults
Twin XL vs Full Mattress

What is a Full Size Mattress?

A full size mattress, also known as a double bed, is 54 inches wide and 75 inches long. It’s 16 inches wider and 5 inches shorter than a twin XL bed. 

A full size mattress is a popular mattress size for many people because of its versatility and its ability to fit in compact spaces yet offer ample sleeping space. It is suitable for single adult sleepers who want to stretch out and sleep and can also be used by two kids or a teen. 


  • Ideal for teenagers and single adults
  • More room to stretch out
  • Easy to move 
  • A good option for small rooms or guest rooms


  • Too small for couples
  • Less legroom for tall sleepers

Twin XL vs Full Size Mattress: What should you consider before buying?

Room Size

For a twin XL mattress, a bedroom that is at least 8 by 10 feet in size is recommended. Because it is smaller than a full size mattress, consider it for the kids room in your house. 

A full size bed takes up less space than a queen bed. If your room is 10 by 10 feet or smaller, choose a full size bed.  This allows you to add furniture and walk about the room more freely.

Both sizes can work in most rooms, but the twin XL is ideal for smaller Rooms. We suggest measuring the room where you intend to position the bed and allowing at least 24 inches between the bed and any adjacent walls or furniture. 

Bed size

For a full size mattress opt for a full bed that is 54 inches wide and 75 inches long. Anything larger than these dimensions would be ideal for a queen bed. A twin XL mattress is better suited for beds closer to 38 inches in width and 80 inches in length. 

The size and dimensions of a product can vary depending on the brand. So, take note of this before you go out and buy a mattress. 


A full bed is suitable for tall sleepers as it offers more surface area than a twin XL. However, a full size mattress is shorter than a twin XL by 5 inches. This means that if you are 6 feet or taller, you’ll probably find more legroom on a twin XL but more sleeping space on a full size mattress. 

A full mattress can be the safer choice for individual sleepers as it offers more sleeping space overall. For taller couples, it might be appropriate to upgrade to a queen. 


You should expect to spend a little more on a full than on a twin XL. The budget version could be close to $700 or more for a full size mattress, whereas the cost of a standard twin XL could be $500 or higher. 


Full and twin XL mattresses are both common mattress sizes, so you can find several accessories for these sizes. A full size bed can easily fit 2 pillows and some throw pillows if you wish to accessorize. A twin size bed can be accessorized with 1 pillow due to limited space. Sheets for a mattress of full size naturally cost more than twin XL as they are larger. However, the price gap is not very high. 

Also Read: Mattresses Sizes Comparison Guide

More on Mattress Sizes

Choosing Between Twin XL vs Full 

Both twin XL mattresses and full size mattresses are great options for small bedrooms, studio apartments, and compact living areas. Their smaller sizes allow for more space and furniture in a room. Twin XL mattresses are best for larger teens, while a full-size bed is better for adults sleeping alone.

Before making the final decision, ensure that you consider the points above.

How we compare to other Brands?

We offer a 365-day trial period and a warranty that lasts forever! If you don’t believe us go ahead and compare our offer to other brands. Apart from being one of the largest mattress sellers in the United States, we give you 9 reasons why nectar may be your best and the last mattress you purchase.

Sleep Trial Warranty Free Shipping * Free Return 2 Free Pillows Free Sheets Free Mattress Protector Price (Queen) Total Price
Nectar 365 Nights Forever Warranty™ check check check check check $799 $799 Shop Mattress
Casper 100 Nights 10 Years check check $178 $139 $95 $1,095 *$1,507+
Purple 100 Nights 10 Years check check $196 check $99 $1,149 *$1,444+
Shop Mattress *Price reflects the subtotal of mattress protector, sheets and two pillows (Single pillow for twin/twinxl) compared to the current promotion on Nectar. Additional shipping fees may apply in AK and HI. Price may not reflect any current promotions or discounts. Last Updated: Mar 2021.
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What is the difference between a twin and a full mattress?

A full mattress, sometimes also called a double bed, is 54 inches wide and 75 inches long. While a twin XL is 38 inches wide and 80 inches long. A twin XL is longer than a full size bed by 5 inches, whereas a full size bed is wider than a twin XL by 16 inches. 

Twin XL vs full size bed- which is better for single adults?

Between twin XL vs full size bed, full size bed is preferable for single sleepers who don’t share their bed with anyone. Single adults with pets can also go for a full-size mattress over a twin XL for the extra space. 

Can two adults sleep on a full mattress?

For couples, a full-size mattress may be too small — 27 inches of space per person may not be sufficient, and only 75 inches is not ideal for taller individuals. A queen, a king, or a California king would suit couples best.