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What Size Bed Do Two Twins Make

Mattress Resources
Read Time: 7 minutes

  • Twin XL Dimensions: Standard twin mattresses are 38 inches wide and 75 inches long, while twin XL mattresses have the same width but are 80 inches long, matching the length of a king-size mattress.
  • Split King Bed Dimensions: A split king bed is essentially a standard king-size mattress split into two separate pieces, each with dimensions equivalent to a twin XL mattress (38 inches wide and 80 inches long).
  • Combining Twin XL Mattresses: To create a split king bed by combining twin XL mattresses, it’s essential to choose mattresses of the same height, arrange them on a king-size bed frame, and consider using a mattress topper or bed bridge to ensure a seamless sleep surface.
  • Bedding Considerations: When combining twin beds, it’s crucial to invest in bedding that fits the combined width and, if necessary, use king-size or queen-size bedding to ensure a proper fit on the larger surface.

If you’re in a situation where you need a larger bed but don’t want to invest in a king-size mattress, putting two twin beds together can be a viable solution. Whether you and your partner have different mattress preferences, you want the flexibility of an adjustable bed frame, or you simply want to save money, combining two twin beds can offer the space and comfort you’re looking for. In this article, we’ll explore the dimensions of twin beds, the concept of a split king bed, and how to connect twin XL mattresses to create a split king bed.

Do Two Twin Beds Make a King?

Contrary to popular belief, two standard twin beds pushed together do not make a king-size bed. A typical twin mattress has dimensions of 38 inches in width and 75 inches in length, whereas a king-size mattress measures 76 inches in width and 80 inches in length. Therefore, combining two standard twin beds will result in a bed that is 5 inches narrower and 5 inches shorter than a king-size mattress.

To create a king-size bed by combining two twin beds, you should opt for two twin XL mattresses instead. Twin XL mattresses have the same width as standard twin mattresses (38 inches) but are 80 inches long, matching the length of a king-size mattress. This means that two twin XL mattresses placed side by side will fit perfectly on a traditional king-size box spring or bed frame.

Here’s a quick comparison of mattress sizes:

Mattress SizeDimensions
Twin38" x 75"
Twin XL38" x 80"
King76" x 80"
Split KingTwo 38" x 80"

What is a Split King Bed?

A split king bed is a standard king-size mattress split down the middle and sold separately. Each segment of a split king mattress corresponds to the dimensions of an extra-long twin bed, measuring 38 inches in width and 80 inches in length. Couples favor split king beds with varying firmness preferences, and individuals use adjustable bed frames.

One of the advantages of purchasing a split king mattress is that the retailer ensures that each side of the bed is exactly the same height. This ensures a seamless sleep surface, allowing you to move freely without encountering a gap or divot in the middle. Some queen and California king mattresses also come in split options, providing alternatives for sleepers who require a queen-size bed or desire more sleeping space than a standard king bed offers.

How to Connect Twin XL Mattresses to Make a Split King Bed

While you can buy a pre-made split king mattress, some prefer to save money by purchasing two twin XL beds. This approach enables customization and flexibility in terms of mattress selection. If you decide to go this route, it’s essential to consider the following steps to successfully connect the twin XL mattresses and create a split king bed.

Choose Your Mattresses

Before combining twin XL mattresses, selecting mattresses of the same height is crucial. If one mattress is taller than the other, it will result in an uneven sleep surface. Additionally, it’s recommended to choose the same type of mattress for both sides of the bed, even if you opt for different brands or firmness levels. This ensures a consistent sleeping experience and prevents one mattress from wearing out faster than the other.

If you need assistance finding the best twin XL mattresses for your needs, various resources are available, such as online reviews and mattress-buying guides.

Arrange the Mattresses on a Frame

Once you have your twin XL mattresses, place them side by side on a standard king-size bed frame or box spring. This arrangement will create a combined width of 76 inches, equivalent to a king-size bed. If you prefer an adjustable bed frame, numerous available options can accommodate twin XL mattresses.

If you’re unsure about the best adjustable bed bases and frames, researching and reading customer reviews can help inform your decision-making process.

Consider Adding a Mattress Topper or Bed Bridge

To ensure a seamless transition between the twin XL mattresses, you may want to consider adding a king-size mattress topper or a bed bridge. A bed bridge is a piece of foam between the two mattresses, preventing any noticeable gap or discomfort. On the other hand, a mattress topper covers both mattresses simultaneously, providing a unified sleeping surface and preventing any potential gapping issues.

If you’re in need of a mattress topper, exploring the top-rated options of the year can help you find the best fit for your split king bed.

Complete the Bed with King Size Sheets

Add king-size sheets that can comfortably cover both twin XL mattresses to finalize your new split king bed. King-size sheets are designed to fit a mattress that measures 76 inches wide by 80 inches long, making them a perfect match for the combined dimensions of a split king bed. Investing in high-quality sheets can enhance your overall sleeping experience and provide a luxurious touch to your bed.

Suppose you’re interested in exploring the best sheets available in the market. In that case, numerous resources, such as buying guides and customer reviews, can steer you in the right direction.

Pros and cons of combining twin beds

Combining twin beds offers several advantages. Firstly, this arrangement provides a larger sleeping surface, offering more space for individuals who require extra room or prefer to sleep without feeling confined. It also allows for customization, as each twin bed can be tailored to the individual’s specific comfort preferences, such as mattress firmness or type.

However, there are also some drawbacks to consider. One of the main disadvantages is the presence of a gap between the twin beds, which can be uncomfortable for some individuals. While a mattress connector or foam pad can help minimize this gap, it may still be noticeable. Additionally, combining twin beds may limit the ability to move or rearrange the furniture in the room, as the beds will be fixed in place.

When it comes to combining twin beds, there are various popular options to consider. One option is to invest in a trundle bed, which features a hidden bed beneath the main bed frame. The trundle bed can be pulled out and raised to the same height as the main bed, effectively creating a larger sleeping surface. This is an ideal choice for guest rooms or children’s bedrooms, as it provides flexibility and convenience.

An alternative is to utilize a daybed with a pull-out trundle. Daybeds are versatile furniture pieces that can serve as seating during the day and transform into a bed at night. Pulling out the trundle, the daybed transforms into a larger bed, accommodating two individuals comfortably. This option is particularly suitable for smaller spaces or multipurpose rooms.

Tips for creating a cohesive look with combined twin beds

Creating a cohesive look with combined twin beds is vital to maintaining the aesthetic appeal of the bedroom. Here are some tips to achieve this:

  • Choose matching or complementary bedding: Select bedding that coordinates well with each other, either matching in color or complementing each other with contrasting patterns or textures.
  • Use decorative pillows and throws: Incorporate decorative pillows and throws that tie the twin beds together visually. This can be achieved by choosing pillows and throws in coordinating colors or patterns.
  • Consider a unified headboard: Install a headboard that spans the width of the combined twin beds. This not only provides a cohesive look but also helps to bridge the gap between the beds, creating a seamless appearance.
  • Coordinate bedside tables and lamps: Choose tables and lamps that match or complement each other. This will help to create a unified look and enhance the overall aesthetics of the combined twin beds.

Finding the right bedding for combined twin beds

There are a few factors to consider when it comes to finding the right bedding for combined twin beds. Firstly, ensure that the bedding fits the combined width of the twin beds. This may require purchasing bedding specifically designed for larger sizes, such as king-size or queen-size bedding. Additionally, consider the depth of the combined twin beds, as this may affect the fit of the fitted sheet.

Opt for bedding sets specifically designed to combine twin beds to ensure a cohesive look. These sets often include matching or coordinating sheets, pillowcases, and comforters or duvet covers. Alternatively, you can mix and match bedding pieces, keeping in mind the overall color scheme and style of the room.

What to consider when purchasing twin beds for a combination

When purchasing twin beds for a combination, there are a few key factors to consider. Firstly, ensure that the twin beds are of the same height and depth to create a seamless surface. Additionally, consider the overall dimensions of the twin beds to ensure they will fit comfortably in the desired space.

It is also important to choose twin beds that offer the desired level of comfort and support. Consider factors such as mattress type, firmness, and quality. Investing in high-quality mattresses will ensure a comfortable and restful sleep experience.

Finally, take into account the style and design of the twin beds. Choose beds that complement the room’s overall aesthetics and match your personal preferences. This will assist in creating a cohesive and visually appealing bedroom.

FAQs about What Size Bed Do Two Twins Make

Do two twin beds make a king?

No, two standard twin beds do not make a king bed. Standard twin beds are 5 inches narrower and 5 inches shorter than king-size mattresses. However, combining two twin XL beds will result in a king-size bed, as twin XL beds have the same width as standard twin beds but are 5 inches longer.

Can two twin beds be put together?

Two twin beds can be combined to create a larger bed. By placing two twin beds side by side, you can achieve the width of a king bed. However, the combined length will be shorter than a king bed. If you don’t mind the slight difference in length, combining twin beds can be a practical solution.

Can I combine twin beds to make a king-size bed?

Yes, by placing two twin beds side by side, you can effectively create a bed that is the same width as a king-size bed.

Will there be a gap between the twin beds when combined?

There may be a small gap between the twin beds when combined. However, this can be minimized by using a mattress connector or foam pad to fill the gap.

Can I use regular twin-size bedding for combined twin beds?

Regular twin-size bedding may not fit properly on combined twin beds. It is recommended to use bedding specifically designed for larger sizes, such as king-size or queen-size.


Combining two twin beds to create a larger sleeping surface is a viable option for individuals who desire more space or have different mattress preferences. While two standard twin beds do not make a king-size bed, twin XL mattresses allow for a perfect fit on a king-size box spring or bed frame. Additionally, split king beds offer a pre-made solution for couples with varying firmness preferences. Following the steps detailed in this article, you can effectively link twin XL mattresses and establish a split king bed tailored to your requirements.

Harrison Wall is Sleep Junkie’s business strategist and sleep analyst. He also authors posts on bedding and mattress accessories. Harrison regularly coordinates with new mattress companies and tests their products to determine what really helps you get better rest and have brighter mornings.

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