Can Two Twin Beds Together Make a King Bed?

Written by Mohammed Aftab

Last Updated March 13, 2024

In the world of solitary slumber, the Twin size bed reigns triumphant, offering a modest 38 inches of width and 75 inches of length. Yet, when the need for a partner enters the equation, the twin bed's appeal quickly dwindles. Brace yourself because when you combine two twin beds, something magical happens – they transform into a king-size bed, lacking just a mere 5 inches of length! Mind you, the real King size mattress measures 76 inches x 80 inches.

latex mattress

In simpler terms, you'll have at your disposal a spacious 76-inch wide and 75-inch long mattress when two standard twin beds unite. In this article, we'll delve deep into whether this solution suits your needs. We'll also explore the possibility of using two twin XL mattresses instead and provide an in-depth examination of the pros and cons associated with each choice you might consider.

two twin beds together

Key Takeaways:

  • Combining two twin-size mattresses results in a bed that is 76 inches wide and 75 inches long, just 5 inches shorter in length than a regular king mattress.
  • Two twin XL mattresses, when combined, however, create a proper king-size mattress measuring 76 inches wide and 80 inches long.
  • To convert two twin XL mattresses into a king bed, place them side by side on a suitable bed base, secure them to prevent shifting, fill the gap in between with a bed bridge or topper, and use king-sized bedding for a comfortable sleep surface.
  • Converting two standard twin beds into a standard king bed requires additional measures to compensate for the missing length, such as DYI-ing using foam padding or a thick headboard.

Do Two Twin Beds Together Make a King Bed?

Unfortunately, two twin beds together do not form a complete king-size bed. Placing two twin-size mattresses (38 x 75 inches) side-by-side yields a mattress with 76 inches of width and 75 inches of length, which is 5 inches shorter than a regular king-size mattress (76 X 80 inches). This reduced length, though relatively small, can lead to some drawbacks.

two twin beds together with dimensions

Let's discuss the pros and cons of putting two twin mattresses together and find out whether these drawbacks affect you -


Customizable Comfort and Support: If you and your partner have different mattress preferences (e.g., different firmness levels), using two twin mattresses allows you to cater to each person's comfort needs. And as we all know, the right mattress firmness is crucial for a good night's sleep.

Flexibility: Combining two twin beds provides the flexibility of creating a larger sleeping surface when needed. It's a practical solution for guest rooms or situations where you occasionally want a larger bed but also need separate beds at times.

Easier Transportation: Two Twin beds are generally easier to transport compared to a single king-size mattress, which can be quite bulky and challenging to maneuver in tight spaces.

Cost Savings: Purchasing two twin beds together might be more cost-effective than buying a single king-size mattress of equivalent quality.


Gap in the Middle: The most significant drawback of putting a twin bed beside another twin bed is the gap that forms in the center, where the two twin beds meet. It can be uncomfortable, especially for couples and light sleepers, as it creates an uneven sleeping surface.

Bedding Challenges: Another big challenge of putting two twin-size beds together is finding suitable bedding and sheets. King-size sheets for standard king beds or split king beds may not fit properly due to the difference in length. You might even need custom-made bedding, bed sheet set, bed frame, etc., which can be less convenient.

Limited Length: As mentioned earlier, the combined length of two twin mattresses is typically 5 inches shorter than a standard king mattress. This reduced length might not be ideal for taller sleepers above 6 feet, as their feet can hang off the end of the bed.

Separation Risk: Without proper securing mechanisms, like a bed bridge, the twin mattresses may shift or separate during the night, leading to discomfort and potential safety hazards.

Do Two Twin XL Beds Together Make a King Bed?

On the flip side, when you place two twin XL mattresses together, they do become full-sized regular king mattresses. This is because the dimensions of a twin XL mattress are 38 x 80 inches, making them 5 inches longer than a standard twin mattress and thereby equaling the length of a king-sized bed.

two twin XL beds together with dimensions

But before you connect twin XL mattresses for a king-size bed, take a look at the pros and cons they entail -


Improved Length: The biggest perk about opting for two twin XLs instead of two twins is the extra 5 inches of length offered, ensuring enough legroom for tall sleepers above 6 feet.

Customizable and Spacious: The combination of two twin XL beds into a king bed offers ample space for couples while also ensuring individual, tailored adjustments on each side of the bed.

Bedding Compatibility: Finding bedding for two twin XLs is easier than for two twin-size mattress configurations. King-sized bedding, such as a king frame, king-size fitted sheet, and king-size mattress topper, can fit effortlessly on a two twin XL mattress setup.


Heavier to Transport: Twin XL mattresses can be slightly bulkier to move compared to standard twin mattresses.

Bit More Costly: Purchasing two twin XL mattresses may be slightly more expensive than buying a standard king bed, a split king bed, or two twin beds.

Gap in the Middle: Even when combining two twin XL beds together, you'll encounter a gap in the middle, causing discomfort for some.

Separation Risk: A lack of proper securing mechanisms, like bed bridges holding the twin XL beds together, may lead to issues like the sleeper falling into the gap.

natural and organic latex mattress topper

How Can You Convert Two Twin XL Mattresses into a King Bed?

Here are the simplified steps to convert two twin XL mattresses into a king mattress -

Materials Needed

  • Two Twin XL mattresses
  • Two Twin XL or One King-sized bed base (Box spring or Foundation)
  • Optional mattress topper(s) or mattress pad(s)
  • King-sized sheets and other bedding


Measure Your Space - Ensure that your bedroom can accommodate a King mattress (76 x 80 inches), which typically requires a minimum room size of 10 x 10 feet or 10 x 12 feet.

measuring bedroom space

Prepare the Bed Frame - Place your chosen bed base(s) in your desired location, ensuring it's level and stable.

preparing bed frame

Position the Twin XL Mattresses - Lay the two Twin XL mattresses side-by-side on the bed base(s), aligning them evenly.

two twins make a king

Secure the Mattresses - Use straps, clips, brackets, or a non-slip rubber pad between/beneath the mattresses to hold them securely.

securing the two beds

Fill the Gap in Between - A bed bridge or a King-sized mattress topper/mattress pad can fill the gap in between and help create a seamless surface.

filling the gap with bed bridge

Dress the Bed - Dress your new Split King mattress with King-sized sheets, pillows, and bedding, ensuring proper fitting.

dressing the bed

Enjoy Your New King Bed - Your converted Split King bed is ready for you and your partner to enjoy!

couple sleeping happy

Additional Tips

Choose Twin XL mattresses of the same height (thickness) for an even sleeping surface.

Customize comfort by selecting Twin XL mattresses with varying firmness levels.

Choose a platform bed frame or adjustable bed frame over box springs.

For added flexibility, use adjustable bed frames.

Regularly check mattress alignment to prevent shifting during sleep.

Is it Possible to Convert Two Standard Twin-Size Beds into a Standard King-Size Bed?

It is possible to convert twin beds into a standard king bed, but you'll have to go through a bit more effort than the steps mentioned above, essentially compensating for the missing 5 inches of length.

To compensate for the shorter length of two twin beds pushed together, consider using a thick headboard to fill the gap at the head of the bed, visually unifying the sleeping surface.

But for a more practical solution, you'll have to DIY with materials like foam padding, which can fit into the 5-inch gap and act as an extension of the two mattresses.

Combining Two Twins vs. Two Twin XLs: Which is Better?

person wondering

"Two twins vs. two twin XLs" is a question with no definite answer. Consider factors like body type, sleep habits, sleep partner preference, bed frames, bedroom size, and budget.

These factors can help you decide between soft mattresses, medium mattresses, and firm mattresses, as well as between a thicker mattress and a thinner mattress.

Plus, you'll be able to find out whether you have enough room to accommodate the entire sleep surface of two twin beds, in addition to whether you'll have to save money when choosing the mattress type.

natural and organic pillows

FAQs for Two Twin Beds Together

1. What size is two twin beds put together?

Two twin beds make a king-size bed that is missing 5 inches of length, i.e., a mattress measuring 76 x 75 inches. While two twins equal the same width as a king bed (76 inches), they fall short in length (75 inches).

2. How do you fill the gap between two twin beds?

You can fill the gap between two single beds (twin beds) using mattress toppers, mattress pads, or bed bridges.

3. Do you need special sheets when combining twin mattresses?

Yes, you most likely will need special sheets that are custom-made to fit a 76-inch by 75-inch mattress, as these are not standard bed sheet dimensions.

4. What is the best mattress type for a split king bed?

For a new bed, we recommend a natural and organic latex mattress. They're eco-friendly and provide a healthy balance between comfort, support, bounce, and response. A latex hybrid mattress is also a great choice, as it provides the best of all foam and spring-type mattresses.

Conversely, if you're seeking a mattress that is very cushioning and would not mind the chemicals that come with it, a memory foam mattress or gel memory foam mattress is an option.

5. Does 2 twin beds make a queen?

No, 2 twin beds do not make a queen size bed.

6. Can 2 twin beds make a full bed?

No, 2 twin beds cannot make a full bed/double bed.

Related blog posts:

1. Mattress Sizes Chart and Bed Dimensions Guide

2. Kids Mattress Sizes

3. Twin Vs Twin XL Mattress Size Comparison

4. King vs. California King

5. Twin vs. Full vs. Queen Mattress Size Comparison

Disclaimer: What is said in this article has been referenced from multiple sources and is intended only for educational and informational purposes. Please note that no content in this article is a substitute for professional advice from a qualified doctor or healthcare provider. Always consult an experienced doctor with any concerns you may have regarding a health condition or treatment, and never disregard any medical suggestions or delay in seeking treatment because of something you read here.