Detailed Mattress Comparison

A full bed is wider than a twin XL mattress whereas a twin XL is longer than a full bed. A full bed measures 54 by 75 inches whereas a twin XL is 38 by 80 inches. 

 A twin XL is meant for tall teens and children outgrowing their crib whereas a full size is popular amongst single sleepers and adults who don’t share their bed. 

Choosing the right mattress for your space usually comes down to the dimensions of the bed, utility, space availability, height, and of course, cost. We have curated a comprehensive guide explaining the difference between twin XL and full-size mattresses. 

Parameters Twin XL Mattress Full 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
Price $799 $899
Bed Size (Inches) 38″ x 75″ 54″ x 75″
Ideal Room size (Feet) 9′ x 9′ 9′ x 9.6′
Comfortably Fits
  • A single adult with an average height
  • Teenagers
  • Tall children
  • Single sleepers who need space
  • Single adult with a pet
Twin XL vs Full Mattresses with Dimensions

What is a Twin XL Size Mattress?

A twin XL is 80 inches long and 38 inches wide and offers additional legroom compared to a standard twin, making it suitable for single sleepers who are tall and do not need extra width space.

A Twin XL is a compact and space-optimized mattress for a room with space constraints. However, despite being five inches longer than the full and twin size mattresses, a twin XL does not offer sufficient space for a couple. 


  • Its longer than a full mattress making it comfortable for taller people
  • Cheaper than a full-size mattress
  • It can easily fit in narrow bedrooms such as dorm rooms
  • Cost-effective, especially for children in their growing years.


  • Fewer accessories compared to a twin or full mattress
  • A twin XL occupies more space and costs more than a twin mattress 
Twin XL vs Full Mattresses

What is a Full Size Mattress?

Full mattresses are 75 inches long and 54 inches wide and are perfect for single sleepers who love to have a little extra space. Full-size mattresses, also known as a double beds, are ideal for guest rooms; the extra inches in width give you some extra space and will not cost you a fortune. They can also be used by couples who like to cuddle and sleep. However, it is not the best option for couples out there. 


  • Spacious enough for a single person
  • The extra space can easily accommodate a small pet
  • Multiple options for accessories and bedding 
  • Cheapest mattress size for adult single sleepers 


  • It cannot accommodate a couple comfortably
  • Shorter than a twin XL, so not suitable for tall individuals 
  • It cannot fit in a narrow bedroom
  • More expensive than a twin XL mattress

Things to Consider Before Deciding Between Twin XL Size vs Full Size Mattress

Who is Using the Mattress

Both twin XL and full mattresses are great options for a single person, but not ideal choice for couples. If you have a pet, you might want extra space on the bed which is possible with full size mattresses but not with twin XL beds. 

Size of the Bed

The bed size required for a twin XL mattress is 38.5” x 75.5,” and for a full mattress, 54.5” x 75.5”. Do check the design, the bed frame, and the brand of the bed before you chose the size.

Extra Accessories

The accessories for a full mattress are more commonly available than a twin XL. A twin XL can be accessorized with a single pillow while a full bed can accommodate two pillows or more if you accessorize the same. 


While a full mattress is more expensive than a twin XL, its accessories also add to the cost. Twin XL costs around $500, whereas a full-size mattress may cost you an additional $200 compared to the price of a twin XL.

Height of the Person

Another factor while selecting a mattress is the height of the sleeper. If the person is tall, it is only wise to buy a twin XL for the extra inches in length instead of a full mattress. 

Bed Room Size

For a twin XL, the ideal bedroom size is 9 feet by 9 feet, while for a full mattress, the perfect bedroom size is 9 feet by 9.6 feet. This difference restricts the twin XL to narrow bedrooms. 

When it comes to the difference between full and twin XL in terms of bedroom size, the only difference is in the width.

More on Mattress Sizes

Choosing between Twin XL vs Full

Both twin Xl and full size mattresses are ideal for single sleepers. Twin XL mattresses are the better option for tall teens and college students while full mattresses are meant for adult single sleepers. Keep the contributing factors in mind before making a decision between full vs twin XL. 

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
DreamCloud Hybrid Mattress 365 Nights Forever Warranty™ check check check check check $999 $999 Shop Mattress
Casper Wave Hybrid 100 Nights 10 Years check check $178 $139 $95 $1,095 *$1,507+
Purple Hybrid 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.


Is a full-size mattress big enough for a couple?

A full-size mattress is sufficient for one person. It can work for couples when they are average build people and like to cuddle.

Can twin-size bedsheets and accessories fit on Twin XL beds?

No, twin XL is 5 inches longer than twin size mattress, and its accessories or bedding cannot fit on a Twin XL.

Can I combine two twin XL mattresses for a King size bed?

Yes, you can combine two Twin XL mattresses to make a king-size bed. It may be an ideal choice for you and your partner if you both toss and turn through the night. Memory foam mattresses are also ideal in such cases. 

I have a small room. Can I place a full mattress in my room?

If a full mattress is placed in a small room, it will make the room feel cramped and leave no space for your furniture. In such a case, a Twin XL is ideal.

What is the difference between a twin and twin XL?

A twin X is 5 inches longer than a standard twin size mattress. Both can be used in a small room or in bunk beds. They are the smallest sizes in the standard mattress sizes available.