Detailed Mattress Comparison

A twin XL and a split king are essentially the same dimensions but a split king is used as one of two mattresses that form a king size bed. A split king is two twin XL’s used in combination to form a king size bed

 A twin XL mattress is 38 inches wide and 80 inches long making it the perfect choice for kids or teens who sleep alone and are taller than the average. Meanwhile, a split king mattress, 76 inches wide and 80 inches long is ideal for couples who like to customize and personalize their side of the bed.  

In this article, we will discuss in detail twin XL vs split king mattress and help you decide which one best suits your needs:

Parameters Twin XL Mattress Split Mattress
IN: 38” x 80” x 11”
FT: 3.2 x 6.7 x 0.9
CM: 96.5 x 203.2 x 27.9
IN: 76” x 80” x 11”
FT: 6.3′ x 6.7′ x 0.9′
CM: 193.04 x 203.2 x 27.9
Price $799 $1138
Bed Size (Inches) 38″ x 80″ 76″ x 80″
Ideal Room size (Feet) 7 X 10 12 X 12
Comfortably Fits
  • Taller adults or teenagers
  • Single sleepers
  • Couples with different sleeping habits
  • Adults with pets

What Is a Twin XL Size Mattress?

Twin XL mattresses are 38 inches wide and 80 inches long. It is five inches longer than the standard twin-size bed and is the exact dimensions as a single split king mattress. It is an excellent option for children, teenagers, and even single adults who prefer compact sleeping spaces. 


  • Ideal for tall teenagers
  • Can fit into small rooms
  • Costs less than other sizes like full, queen, and king-sized mattresses
  • Offers easy mobility
  • Accessories are readily available


  • Not suitable for couples
  • Does not have much space for accessories

What Is a Split King Size Mattress?

A split king size mattress is 76 inches wide and 80 inches long. It is similar to a standard king size mattress but has a split in the middle and is 2 inches wider than a king size bed. 

A Split king bed has an adjustable base and can accommodate two twin XL mattresses of different variants. If you join two twin XL beds, it will form a split king bed. It is ideal for couples with different sleeping preferences. 


  • Best-suited for couples with different mattress choices
  • Negligible motion transfer and sleep disturbance


  • More expensive than twin XL
  • Accessories are not easily available
  • It can only fit in large rooms, like the master bedroom

Things to Consider Before Deciding Between Twin XL Size vs Split King Size Mattress

Room Size

Twin XL mattresses are convenient and can fit into compact rooms like dormitories, small apartments/studios, hostels, and bunk beds. A room that is 7 by 10 feet is ideal for twin XL beds as it offers extra space in the room after placing the bed. 

A split king mattress fits well in rooms that are at least 12 by 12 feet. A Master bedroom, primary bedroom, or a room bigger than 12 by 12 feet is ideal for a split king bed which is the same dimensions as a king size bed.


Split king mattresses are 38 inches wider than twin XL mattresses. Therefore, the number and size of accessories that can fit on split king mattresses will be more than a twin XL. A twin XL mattress can fit a single pillow, whereas a split king can fit two pillows, some throw pillows, and other accessories. However, accessories for a split king are not readily available and will be more expensive than accessories for a twin XL. 


A split king mattress can cost twice as much as a twin XL mattress. Apart from the size and type, a mattress’s price also depends on several other factors.  The manufacturing material such as memory foam mattresses, hybrid mattresses, and the brand affect the price of the mattress.

Bed Size

A bed that is 38 inches wide and 80 inches long can perfectly accommodate a twin XL mattress of 38” x 80”. A split king mattress of 76” x 80” needs a bed frame of 76 inches in width and 80 inches in length.

A split king mattress needs a split king adjustable bed frame that has a split down the middle for a couple to enjoy complete freedom of customization. You can also integrate two twin XL beds, keep them side by side to form a single split king bed. 

Sleeping Partner

A split king mattress allows you to share your bed with your partner without causing motion transfer. This means that if you like to twist and turn through the night, your partner will not feel it. The split in a split king is designed so that you and your partner can choose the mattress type, the sheets, the accessories for your respective sides while sharing the bed.

A twin XL cannot be shared with a partner, a per or a child. The dimensions of a twin XL are too small for two people to share it. 

More on Mattress Sizes

Choosing between Twin XL vs Split King

Twin XL mattresses are best-suited for single sleepers, whereas couples should opt for split king mattresses. Choosing the right mattress is a difficult decision. You have to consider many factors, especially who will be using the mattress and their sleeping behavior. So, keep your requirements in check and buy a mattress that best suits your needs.

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 split king mattress the same as a traditional king mattress?

Both split king and traditional king mattress have similar dimensions; however, the former has a split in the middle. Also, split king mattresses are 2 inches wider than king mattresses. 

Do two twin XL beds make a California king bed?

No. A traditional king mattress can be made from two twin XL beds. A California king mattress is 72 inches by 84 inches, while two twin XL mattresses mounted side by side are 76 inches by 80 inches (standard king size). A king and California king are both suitable for master bedrooms and for couples. 

Can I use twin sheets on a split king mattress?

Yes, you can use two twin sheets on a split king mattress because the split king’s width is double the twin mattress, and both have equal lengths. Other sleep products such as duvets and cover can also be shared between a twin XL mattress and a split king. 

How to choose between Split king vs king size mattress?

If you sleep with your partner and have different sleep styles or need separate mattresses, the split king is a suitable option. In split king, each sleeper enjoys 38 by 80 inches of personal space.  Personalization within the same bed is not possible in a standard king. 

What is the difference between a twin size mattress and a twin XL mattress?

Twin XL mattresses are five inches longer than twin mattresses. The width of both mattresses is the same.