What Size Bed Do Two Twins Make?

February 22, 2021 | Casper Editorial Team

If you’re in the process of redecorating your master bedroom, a new bed might be the first thing on your mind. But if you’re sharing a room with a partner that has distinctly different preferences than you, a king size mattress might not be the best choice — for your sleeping arrangements or your relationship. 

But what if you pushed two twin beds together instead? What would that leave you with? What do two twin beds make?

If you’ve got the room for it, two twins make a king size bed. Well, almost.

While pushing two mattresses together opens up a whole new set of possibilities, we’ll explain roughly how big it will be below.

Do Two Twins Beds Make a King?

If you’re looking to equip a master bedroom with a share-worthy bed, the first question on your mind is probably, “do two twins equal a king?” 

A standard twin mattress measures 38 inches by 75 inches, whereas a king mattress comes in at 76 inches by 80 inches. 

So, do two twin beds make a king? Like we mentioned above, they almost do, but not exactly.

Then, what size does two twin beds make? If you chose to combine two twin size mattresses, you’d have a bed that is neither here nor there; not quite the size of a king bed but pretty close. 

The width of two twins is the same as the width of a king sized bed, but your new creation will be five inches shorter than a traditional king. If neither you nor your partner is especially tall, this plan could still work for you. 

Twin XLs for the Perfect King Size

But there is a way to combine two mattresses to make a king: use two twin XLs.

As the name suggests, twin XLs are exactly like a standard twin mattress but extra-long. Length is the major difference between a twin vs twin XL. Twin XLs are just as long as a king and queen mattress but half as wide.

When you combine two twin XL foam mattresses, you get the exact same size as a king bed — 76 by 80 inches — with the freedom to opt for two different mattress types.

Selecting Mattresses That Work for Everyone

The beauty of combining two twins or twin XLs is that you don’t have to fight over mattress firmness, material, or composition. Plus, if either of you is a major tosser and turner, you don’t have to deal with constant shakes and quakes from your shared mattress. Whether you choose to combine a twin or twin XL, be sure you purchase twin sheet sets that are the correct size for your mattress setup.

You and your partner can each buy a twin size mattress that checks all the boxes for you, then push them together with one set of bedding —voilà, you’ve got a king size bed and two happy sleepers!

So what should you consider as you embark on your mattress hunt? Here are some important factors that can change the feel and functionality of your bed:

  • Inner composition – Lately, mattresses have been moving away from traditional box springs and towards hybrid or all-foam mattresses. A memory foam mattress provides a firm base and ample support, while a hybrid mattress incorporates the springiness of, well, springs with plush layers of foam on top.
  • Firmness – Preferred mattress firmness can vary drastically from person to person. It’s usually ranked on a scale of one to ten: soft mattresses fall between three and five, medium mattresses between six and seven, and firm mattresses at an eight or above.

    Soft mattresses are perfect for side sleepers with sore muscles and joints, mediums are ideal for combo sleepers (front, back, side, you name it), and firm mattresses are important for stomach sleepers to avoid feeling smothered.
  • Height – Mattress height doesn’t usually factor into the equation, except that a thicker mattress may suggest increased comfort. But when you’re combining two twin size beds into one super pseudo-king, you’ll likely be more comfortable with two mattresses at approximately the same height. 

Finding Your Perfect Match at Casper

Many twin and twin XL mattresses, often used as a bunk bed mattress size, are cheap, short-lived, and ready for the throwaway bin after only a few short years. Why? Because they’re made for kids who outgrow their beds faster than you can read them a bedtime story

Casper’s twin mattresses are made with enhanced comfortability, advanced cooling technology, and built-to-last materials that any adult (or child) will enjoy. Between Casper’s four unique mattress compositions in all six standard mattress sizes — including twin and twin XL — both you and your partner will easily be able to find something that supports your sleeping style. And if you don’t? Return it within 100 days and try again!


The Better Sleep Council. Fit for a King, but a King Might Not Fit. https://bettersleep.org/mattress-sizes/