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Twin XL vs. Split King: What’s the Difference?

By: Christina Davies
Updated on: January 29, 2025
FAST FACTS

  • Twin XL mattresses are suitable for single sleepers, especially taller individuals, and are often used in children’s rooms, dorms, and small spaces.
  • Split King mattresses are essentially two Twin XL beds placed side by side, providing personalized comfort for couples with different sleep preferences.
  • Consider your bedroom size, budget, and whether you’re sleeping alone or with a partner when choosing between Twin XL and Split King mattresses.
  • Twin XL mattresses are budget-friendly and space-saving, while Split King mattresses offer individualized support and are compatible with adjustable bed frames.

When choosing a mattress, there are many factors to consider. One important decision is the size of the bed. Two popular options for larger beds are the Twin XL and the Split King-size mattress. While they may seem similar at first glance, the two have significant differences. This article will explore the features, benefits, drawbacks, and prices of Twin XL and Split King mattresses to help you make an informed decision.

What Is a Twin XL Size?

The Twin XL mattress is popular for children’s rooms, college dorms, guest rooms, and spare bedrooms. It measures 38 inches by 80 inches, making it 5 inches longer than a standard Twin mattress. The extra length is beneficial for growing teenagers or taller adults who need additional legroom. Twin XL mattresses are also compatible with bunk beds, making them a practical option for families with multiple children or limited sleeping space otherwise.

Benefits of Twin XL Size

  • Suitable for growing teenagers and tall adults
  • Lightweight and easy to carry
  • Compatible with bunk beds
  • Longer than a standard Twin mattress

Drawbacks of Twin XL Size

  • Not suitable for couples
  • Limited space for co-sleeping with a pet or child

Twin XL Ideal Room Size

In general, you’ll want approximately two feet of clearance around three sides of your bed to ensure easy access and movement in your room. This means a minimum of 7 feet in width and 8.5 feet in length for a comfortable bed fit.

Keep in mind your bedroom furniture needs. You’ll require extra space if your bedroom space includes a dresser, night tables, or other furnishings. An 8 by 10-foot room will provide ample room for bedroom furniture.

Twin XL mattresses have the advantage of being designed for single adults. This means they can be placed against the wall in tight spaces. If you position a twin XL bed against the wall without additional furniture, you can make do with a room as small as 5 by 7 feet. This allows for converting small spaces, such as walk-in closets or maid’s rooms, into bedrooms when needed.

Ideal for Twin XL Sleepers

The twin XL mattress is a smart choice for those seeking a space-saving bed without compromising on legroom. It’s especially well-suited for single sleepers who are taller than six feet and need to accommodate their bed in a smaller space, such as a college dorm room, room, or studio apartment.

Twin XL mattresses are also a great solution for multiple twin beds. They’re perfect for bunk beds and can even be placed side by side in a guest room.

Twin XL vs. Standard Twin

Let’s clarify the distinction between a Twin XL size mattress and a twin XL mattress. The twin XL mattress adds an extra five inches to the dimensions of the standard twin bed, which measures 38 by 75 inches. This means the twin XL offers more space, making it a comfortable choice for taller individuals compared to the standard twin bed.

What Is a Split King Size?

A Split King mattress is essentially two Twin XL beds placed side by side in a frame. Each Twin XL bed measures 38 inches by 80 inches, resulting in twin XL size beds with a combined size equal to that of a standard King mattress. Split King mattresses are the best choice for couples with different sleep needs. The split design allows each sleeper to customize their side of the bed according to their comfort preferences. This setup is particularly useful for couples with different firmness or support requirements.

Benefits of Split King-Size

  • Personalized comfort and support for each sleeper
  • Lightweight and easy to maneuver
  • Ideal for use with adjustable bed frames

Drawbacks of Split King-Size

  • Higher cost compared to other mattress sizes
  • Difficulty finding matching sheet sets

Split King Ideal Room Size

A split king-size bed measures precisely 6 feet in width and slightly over 6.5 feet in length. In order to accommodate only the king-size bed frame, your room should have a minimum size of 8.5 by 10 feet. However, if you plan to include standard bedroom furniture, a room measuring no less than 10 by 10 feet, or even better, 10 by 12 feet, would be more suitable.

Ideal Sleepers for a Split King

The split king-size bed was specifically designed to accommodate couples with different sleep preferences. It’s a smart solution for couples where one person prefers a firmer mattress while the other prefers a softer one. This way, each partner can choose the mattress firmness that suits them best.

Moreover, split king mattresses offer the flexibility to select different materials. For instance, if one partner prefers a hybrid mattress and the other prefers latex, they can both get what they want without needing separate beds.

One of the most popular applications of split king twin-size mattresses is in combination with split king adjustable beds. These adjustable beds allow each sleeper to customize their sleeping position without affecting their partner. So, if one partner wants to lie flat while the other prefers the zero-gravity position, having two separate twin XL mattresses enables them to set their adjustable beds to their liking without the need to sleep separately.

Split King vs. Standard King

Split king mattresses and standard king mattresses share the same dimensions. The key distinction lies in their configuration: a split king consists of two twin XL beds within a single frame, whereas a standard king is the two twin XLs within a single, unified king-sized mattress.

Comparison Chart: Twin XL vs. Split King

Here’s a concise comparison table highlighting the key differences between Twin XL and Split King mattresses:

AspectTwin XLSplit King
Size
38″ x 80″
Two Twin XLs (38″ x 80″ each)
Suitable forSingle adults, kidsCouples with different sleep preferences
Room SizeSmaller rooms with limited spaceLarger bedrooms with ample space
Price Range (Amerisleep)$699 – $1999$1398 – $3998
Ideal forTight spaces, bunk bedsCouples with differing comfort needs, adjustable beds
Sheet CompatibilityStandard Twin XL sheetsIt may require special split king sheets
Customized ComfortNot applicableEach sleeper can choose their preferred mattress firmness and type

Twin XL vs. Split King: Which Is Better?

Twin XL vs. Split King twin xl fitted sheets, california king mattress, split california king mattress

The choice between a Twin XL and a Split King mattress depends on several factors, including the size of your bedroom, your mattress budget, and whether you are sleeping alone or with a partner.

Size of Your Bedroom

When considering the size of your bedroom, it’s important to determine if a King-size mattress will fit comfortably. King mattresses take up a significant amount of room, so make sure you have enough space to move around freely without feeling cramped.

Mattress Budget

It’s essential to consider your mattress budget before making a decision. Generally, a smaller mattress like the Twin XL will cost less than a larger one like the Split King. Take into account your financial constraints and choose the option that best fits your budget.

Sleeping Alone or with a Partner?

If you plan on sleeping alone for the foreseeable future, a Twin XL mattress may be sufficient. However, when sharing a bed with a partner, a Split King provides individualized comfort and support for each sleeper. This setup is especially beneficial if you and your partner have different sleep preferences or physical needs.

Other Mattress Sizes to Consider

If neither the Twin XL nor the Split King suits your needs, other mattress sizes are available. These include the Twin, Full, Queen, and California King. Each size has its own unique dimensions and benefits, so be sure to explore all options before making a final decision.

  • Twin Size: Measuring 38 inches by 74 inches, the Twin is suitable for children and single adults.
  • Full Size: The Full or Double bed is 16 inches wider than a Twin and may accommodate one adult and a child.
  • Queen Size: Queen mattresses are the famous choice for single sleepers and couples, offering more room to stretch and sleep comfortably.
  • King Size: King mattresses are ideal for couples and larger master bedrooms, providing ample space for two adults and potentially children as well.
  • California King Size: The California King is longer than a standard King bed, making it a suitable choice for taller individuals who require additional leg space.

FAQs

Can I use Twin XL mattresses on a Split King adjustable bed frame?

Yes, most Split King adjustable bed frames are designed to accommodate two Twin XL mattresses, allowing for individual customization.

What’s the best mattress type for Twin XL beds?

The choice of mattress type depends on your personal preference. Memory foam, innerspring, and hybrid mattresses are all available in Twin XL sizes.

Are Split King beds noisy when adjusting positions?

No, Modern Split King adjustable beds are designed to function quietly, ensuring that they disturb your sleep as little as possible.

Can I use regular King-sized bedding on a Split King bed?

No, you’ll need Twin XL-sized sheets and bedding for a Split King bed to accommodate the two separate twin mattresses.

Do Split King beds require two separate bed frames?

Yes, to properly support the two Twin XL mattresses, it’s recommended to use two separate bed frames or an adjustable bed frame specifically designed for Split Kings.

Are Split King beds suitable for couples with different sleep schedules?

Yes, Split King beds are an excellent choice for couples with varying sleep routines. Each partner can customize their side of the bed without causing any disturbance to the other.

Conclusion

Choosing the right mattress size is vital for a good night’s sleep. Both Twin XL and Split King mattresses have their own unique advantages and considerations. The Twin XL is ideal for solo sleepers, while the Split King offers personalized comfort for couples with different sleep needs. Consider factors such as bedroom size, budget, and sleeping arrangements when making your decision. With the information provided in this article, you can now make an informed choice and find the perfect mattress for your needs.

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