Twin XL vs Split King: What's The Difference?

Written by
 Purple Staff
Last Updated
December 6, 2022
min read

The difference between a twin XL bed and a split king bed is that the former is a narrow bed recommended for single sleepers while the latter is a wide bed that can fit two to three sleepers.

If you want to learn more about the differences and similarities between twin XL and split king beds, keep reading. Below, we answer some of the most common questions about the twin xl vs split king mattresses, such as "How many people can fit in a twin XL versus a split king bed?" and "Do two twin XLs make a king?"

To compare other similar mattress sizes, check out some of our other bed size and mattress type guides below:

What Is A Twin XL Mattress?

A twin XL mattress has the same width as a twin mattress but is longer by five inches, making it more suitable for taller sleepers.

Twin XL Mattress Dimensions

Twin XL mattresses measure 38 inches wide by 80 inches long or 96.5 x 203.2 cm.

Who Should Sleep On A Twin XL Bed?

Twin XL and twin-size mattresses are designed for single sleepers who have narrow bedrooms. Generally, these two mattress sizes are good fits for kids, teens, and single adults on the petite side.

Twin XL mattresses are longer than twin mattresses by five inches and, as such, recommended for tall people who want more leg room to stretch out.

Ideal Spaces For A Twin XL Bed

The minimum ideal space for a twin XL is a bedroom that measures 8 x 10 feet. Given their narrow width, twin XL mattresses make for excellent detached and bunk beds in small kids' bedrooms or college dorm rooms.

Average Cost Of A Twin XL Bed

Twin XL mattresses cost between $100 to $3,000, depending on the material and quality of the bed.

What Is A Split King Mattress?

A split king mattress consists of two twin XL-size mattresses joined by a metal bar, elastic strap, and/or a fitted bed frame. Split king mattresses are often used with specially made split king bed frames that are adjustable on each side.

Split King Mattress Dimensions

A split king mattress measures 76 inches by 80 inches, the same as a standard king mattress. When separated, each of the two halves of a split king mattress measure 38 inches by 80 inches, the same as a twin XL.

Who Should Sleep On A Split King Bed?

Couples who want more personal sleeping space or to avoid feeling motion transfer could all benefit from sleeping on a split king mattress.

Couples who have different sleeping preferences might also benefit greatly from a split king-size bed, especially if they pair their mattresses with an adjustable base. Adjustable bed frames allow each person to adjust their side of the bed separately, giving them more control over how they want to sleep at night.

Essentially, sleeping on a split king mattress is the closest thing you can get to sleeping on separate mattresses without having two separate beds in your room.

Ideal Spaces For A Split King Bed

Split-king mattresses require more bedroom space than most mattresses. The ideal space for a split king mattress is a bedroom that is at least 10 x 12 feet, the same amount of space that is recommended for a regular king-size mattress.

Average Cost Of A Split King Bed

Split king mattresses cost anywhere from $1500 to $8,000, a few hundred dollars more than the average king-size mattress.

Do Two Twin XL Mattresses Make A King?

Yes, two twin XL mattresses together make a king-size bed. As such, split king mattresses are also called "twin king" or "dual king" mattresses.

Other Standard Bed Sizes

Compare twin XL and split king beds with other popular bed sizes below:


Mattress Dimensions

Bed Frame Dimensions

Best for






38” x 75”

96.5 x 190.5 cm

40-43” x 77-80”

101.6-109.22 x 195.58-203.2 cm

Single sleepers

Twin XL

38” x 80”

96.5 x 203.2 cm

40-43” x 82-85”

101.6-109.22 x 208.28-215.9 cm

Taller single sleepers


54” x 75”

137.2 x 190.5 cm

56-59” x 77-80”

142.24-149.86 x 195.58-203.2 cm

Single sleepers who want more space in bed or couples who don’t mind sleeping close to each other


60” x 80”

152.4 x 203.2 cm

62-65” x 82-85”

157.48-165.1 x 208.28-215.9 cm

Single sleepers, couples, or those who prefer to sleep beside their small kids and/or pets

Super king

72” x 78”

182.9 x 198.12 cm

74-77” x 80-83”

187.96-195.58 x 203.2-210.82 cm 

Couples who want something bigger than a queen mattress but don’t have enough space for a standard king


76” x 80”

193 x 203.2 cm

78-81” x 82-85”

198.12-205.74 x 208.28-215.9 cm

Couples with at least 12 x 12-foot or larger bedrooms or want more personal space in bed

California king

72” x 84”

182.9 x 213.4 cm

74-77” x 86-89”

187.96-195.58 x 218.44-226.02 cm

Tall couples who need extra room to stretch out


Factors To Consider When Choosing Between A Twin XL And A Split King

When deciding between different mattress sizes, remember to keep the following factors in mind:

The Number Of People Sleeping in The Bed

Not all bed sizes can accommodate more than one person, so if you're sharing a bed with a partner, make sure to choose a size that's big enough for both of you.

Also consider sleeping preferences. For example a split king allows one person to sleep on a separate firm mattress and the other a plush mattress.

Your Individual Sleep Preferences

Consider your sleeping preferences and choose a mattress accordingly. If you have a partner, find a balance of firmness that works for both of you. If you cant find a balance a split king can be a good option. 

Not sure what firmness you prefer? Read our mattress firmness guide to help you choose.

Bedroom Size And Layout

Allocate ample floor space not only for your bed but also for walking space and furniture as well. Before you go bed shopping, get the exact dimensions of your bedroom so that you don't accidentally get a bed that is way too big for the space you have.

Below are the minimum bedroom sizes for each popular bed size:

  • Twin bed: 7 x 9 feet
  • Twin XL bed: 8 x 10 feet
  • Full bed: 9 x 10 feet
  • Queen bed: 10 x 10 feet
  • King bed: 10 x 12 feet

Bed Frame Material And Design

Some bed frames are bulkier than others, especially if they have embellishments such as headboards, footboards, and pull-out drawers. If you're buying beds for compact spaces, make sure to pick out a bed frame design that doesn't take up too much space. Minimalist platform beds with no headboards are a good option for small bedrooms.

Twin XL vs Split King FAQs

Is a twin XL the same as a split king mattress?

No, a twin XL is not the same as a split king mattress. However, a split king mattress is made up of two twin XL mattresses combined.

Will split king sheets fit a twin XL mattress?

No, split king sheets won’t fit on a twin XL mattress as it’s double the measurement. However, split king sheets fit two twin XL mattresses placed side by side.

Can you feel the split in a split king bed?

No, you usually cannot feel the split in a split king bed. Split king beds are designed in such a way that the mattresses are close enough together for sleepers not to feel the gap