Do Two Twin Mattresses Equal A King Size Bed?

Estimated reading time: 6 minutes

Whatever your reasoning for asking the question do two twin mattresses equal a king bed, whether it be a simple bet with someone or coming up with a solution to resolve a problem, like fitting through a tight space, there is an answer to the question. The answer is a bit confusing and a little complicated so we’ll lay out the 2 part answer in detail.

King, 2 Twins, 2 Twin XLs: It’s So Confusing

So yes technically width-wise they do, an eastern king in width is nothing more than two twin beds pushed together side by side. What you might be surprised to learn is that it does NOT equal an eastern king in length. Industry people often call this a really short king.

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Many people like yourself opt to use their twin beds this way, but quickly become confused and have problems figuring out what size sheets, mattress pads, protectors, blankets and comforters might actually fit this makeshift king. Whatever it is called it is not a standard industry-recognized size, so we’ll attempt to sort out the details and facts about this mattress conundrum.

The Devil Is In The Details

• The industry standard mattress size for an Eastern King size bed is 76 x 80.
• Putting two twin-size box springs side by side underneath measures 76 x 75
• Putting an 80-inch long eastern king mattress on two regular 75-inch twin box springs really does not work correctly.

The fact is the two side-by-side 75” long beds end up 5 inches shorter than the 80” long eastern king mattress. With the 80-inch mattress hanging off the end of the twin box spring by 5 inches the mattress is left unsupported which will damage the mattress, make it unsafe to sit on, and void any manufacturer’s warranty you might have.

Take a look at this video about Split Box Springs.

Do Two Twin Extra Long Mattresses Make A King Size Bed?

Yes in fact they do, the mattress industry uses:

• 2 twin E.L. (Extra Long) boxsprings which each measure 38 x 80 each.
• The twin E.L box springs are then placed underneath a 76 x 80 eastern king mattress.

We also reference these as Twin XL – extra long.

Check Out Our Quick Assemble Foundation Box Spring (King)

See It’s That Simple

What makes all of this so confusing to some consumers is that they insist on pushing two twins side by side making their beds exactly the same width as a standard eastern king-size bed, but those very same people didn’t pay attention to the details of length. They then run out and visit your local department stores like Kohl’s, JC Penny’s, and Bed Bath and Beyond or purchase king-size sheets on the Internet only to find that the sheet set does not fit properly, leaving the king-fitted sheet fitting with a sloppy and a whole lot of slack.

What About California King?

I have also read where individuals believe that 2 twin box springs will fit underneath a California King. California kings measure 72 wide x 84 long. This is not true. The mattress and box spring industry specifically supply these mattress set shoppers with two 36 x 84 boxsprings to fit perfectly under this uniquely extra-long mattress. Sheets also are available in Cal. King Size.

Getting A Large Bed To An Upstairs Bedroom

One major reason people seek out alternative solutions is that they have decided to change their queen to a king only to discover that a king won’t fit up the stairs or make it through a tight spot. We have some solutions. Just like building a house, you start with the foundation.

Forever Foundations offers some of the strongest and easiest solutions for couples who want to sleep on a bed that is not separated. Unlike traditional twin XL box springs, the Forever Store More comes disassembled. It can easily be maneuvered into the toughest-to-reach of bedrooms, assembled with or without a bed frame since it offers 4 different leg heights, and finally, a place to put a king-size mattress on it. Learn more about what king-size mattresses you can bend and fold.

Related: Queen Mattress Vs. Full Mattress

So What Happens If I Push My Two Twin Mattresses Together?

For those who would like to push twins together and make a “short king” this is America – go for it! However, to my knowledge there are no bedding ensembles made to fit this, so here is my solution. Improvise by purchasing two fitted twin sheets, one king flat sheet, and 2 king-size pillowcases separately.

You are now ready to stop sleeping like Lucy and Ricky and push your beds together.

Check Out Some Of Our Mattresses

Two Twins Mattresses Equal A King FAQs

• Can You Use Two Twin Mattresses As A King? – Two twins make a king, but not just any twins will do. A standard king-size mattress is 76 inches wide and 80 inches long. … The easy solution to this conundrum is to use two XL twin beds which, at 80 inches in length, will be exactly the same length as a king-size mattress.
• How Do You Turn Two Twins Into A King? – Two Twins make a king with a gap, but they don’t have to. Insert a bed bridge between the two mattresses. Widely available online, a bed bridge is designed to fill the gap between the two beds and provide an even sleep surface, identical to what you’d get in a regular king-size mattress.
• What Size Box Spring Goes Under A King Mattress? – Two twin box springs are usually used beneath a king mattress. If you are just putting the Queen and twin box springs on the floor with no frame then it will technically work to support the king mattress but you will have an extra box spring surface that the mattress will not cover.
• What Size Is 2 Twin Beds Put Together? – Two twins make a king, but not just any twins will do. A standard king-size mattress is 76 inches wide and 80 inches long. A standard twin bed is 38 inches wide and 75 inches long.
• Do 2 Twin Beds Make A Queen? – Two TWIN mattresses do not make up a QUEEN size. This is known as a split box spring.  Two TWIN XL will make a KING size. Per side of the frame for the QUEEN size will not provide enough support for a TWIN mattress.