What Is A Split King?

If you’re shopping for a new mattress for the first time in a while, it’s easy to get confused by the different sizes of mattresses that are available. Most people are generally familiar with basic sizes like twin, queen, and king, but what about more speciality sizes, such as a split king? Let’s dive into what exactly a split king mattress is.

Split King Mattress vs King Mattress

To put it simply, a split king is a king size mattress split into two mattresses. Another way to think about it is two twin XL mattresses put together to form one mattress the same size as a king. A king size mattress is generally 76 inches by 80 inches, so two twin XL mattresses — 38 inches by 80 inches — put together is equivalent to a regular king. Usually, the two smaller mattresses will be placed next to each other on a king bed frame or platform so that they are connected closely enough to look like a normal king mattress.

What is the purpose of having a split king instead of just a regular, conjoined king mattress? The main reason is to allow couples to customize their bed to be comfortable for both partners. It’s no secret that sharing a bed can present issues for couples, particularly those with different sleep habits and preferences.

There are plenty of solutions to try — including trying a “sleep divorce,” in which partners sleep completely separate from one another — but a split king mattress can offer a middle ground between sharing a bed and splitting up completely.

Pros and Cons of Split King Mattresses

Split King Pros:

• Couples can meet their unique sleep needs while still sharing a bed
• Reduced motion transfer
• Allows couples to use adjustable bed frames with customizable sides
• Easier to move than a king size mattress

Split King Cons:

• More expensive than a traditional king size mattress
• Split kings have a split down the middle of the bed, which may be uncomfortable to some sleepers
• Not all brands offer split kings or twin XL mattresses

Benefits of Split King Mattresses

Different Firmness Levels

With a split king, partners who prefer different feels from their mattress can each have a bed that suits them. One partner can have a softer mattress, while the other can opt for a firmer one. This can be helpful, for example, if one partner is a stomach sleeper and the other is a side sleeper — stomach sleepers tend to need a firmer sleep surface, while side sleepers need plush, pressure relief for their shoulders and hips. Or it could be beneficial if one partner is significantly heavier than the other and needs a firmer, more supportive mattress.

Reduced Motion Transfer

Another benefit of split king mattresses is they can have less motion transfer than traditional king mattresses. Motion transfer refers to movement spreading from one side of the bed to the other. If you’ve ever been woken up by your partner’s tossing and turning causing the whole mattress to jiggle, you’ve experienced motion transfer. Because the beds are disconnected, you are less likely to experience that transfer of motion on a split king.

Split King Adjustable Bed Frames

Split kings are also commonly used on adjustable bed frames so each partner can independently adjust their side of the bed — for example, if one partner wants to raise their side of the bed to sit up and read, while the other wants to sleep in a reclining position.

How Much Does A Split King Bed Cost?

A split king mattress will generally cost more than a king mattress, as you are purchasing two individual twin XL mattresses instead of just one king size mattress. But the price difference between a split king and a king can vary quite a bit between brands.

For a general estimate, the average difference in price between a split king and king of the mattresses on our best mattress page is $363. Split king mattresses can range in price from around $700 to $4,000.

What Is The Best Split King?

As with all mattresses, which split king is best for you depends on your individual preferences and needs. However, you can take a look at our best twin XL mattresses and best mattress page to see some of the Sleepopolis teams’ favorite options.

Mattress Sizes and Dimensions

Curious about how a split king compares to other mattress sizes? Here’s a breakdown of different mattress sizes and the dimensions they generally abide by. For more information, take a look at our mattress size guide.