Do Two Twins Equal a King?

Do two twin mattressess make a king size bed?

You might be surprised to learn that these are nothing more than 2 twins beds pushed together. Industry pros might call it a really short king. Much confusion surrounds what this make shift bed size really is. What ever you call it there are some interesting facts about this mattress conundrum.

The industry standard mattress size for an Eastern King size bed 76 x 80. Putting two twin size box springs underneath measures 38 x 75. Putting an 80 inch king mattress on two regular 75 inch twin boxsprings is in fact 5 inches shorter than the king mattress leaving the 80 inch mattress hanging off the ends of  twin boxspring by 5 inches leaving the mattress unsupported.

Do two twin extra longs make a king?

The mattress industry uses 2 Twin E.L. (Extra Long) boxsprings which each measures 38 x 80 under a 76 x 80 king mattress. What makes this whole thing confusing is when you place 2 twin mattresses side by side they are the exact same width as a standard king size bed. Many people insist pushing two twins together are the same as a king, however when you visit your local department stores like Kohl’s, JC Penny’s and Bed Bath and Beyond and purchase king size sheets, you will find that the fitted sheet does not fit, leaving the king fitted sheet fitting with 5 inches of slack.

I have often read that 2 twin box springs will fit underneath a California King, which measures 72 x 84. This is not true. The mattress and box spring industry specifically makes a 36 x 84 boxspring for the Cal. King bed which uses 2 that fit perfectly under this extra long mattress. Sheets also are available in Cal. King size.

So what happens if I push my two twin mattresses together?

For those who would like to push to twins together and make a “short king”, this is America – go for it! However, to my knowledge there is 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 pillow cases separately.

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


Doug Belleville and his father Dave own and run STLBeds - a specialty sleep store located in Arnold, MO. The staff at STLBeds is highly educated about sleep, comfort and their special sleep products. STLBeds only carries high quality mattresses and bed-related products. You won't find the brand names here - just call and ask us why!

15 Comments Leave your comment »

I am looking for two twin size mattresses that fit Cal King twin box springs. Is there such a thing?

Comment by Renee — May 27, 2013 @ 1:10 pm

You could have a mattress manufacturer make it to order. Northwest Mattresses in Spokane, WA, ships all over.

Comment by Georgia — August 1, 2013 @ 3:38 pm

In Europe all “King” beds are two double beds pushed together. Bedding is separate for each bed, including the duvets. I actually found they worked quite well. They look like this I hope that helps.

Comment by Dodie — June 15, 2014 @ 11:14 pm

If I get 2 Twin XL box springs and 2 Twin XL mattresses, will the king size sheets fit?

Comment by Dee — July 24, 2014 @ 10:36 am

Hi Dee, King sheets should fit it which no issues. They also make what is called split king sheets which have 2 twin extra long fitted sheets and one king flat sheet. These are especially nice if you have what is called a swing hinge kit. Doug

Comment by Douglas Belleville — July 25, 2014 @ 7:46 am

I am considering 2 XL Twin matresses put together. Do you believe this will minimze movement distubances and would a California King comforter be the best size for this pair?
Thank you for this infomation!

Comment by Brandy Watson — July 29, 2014 @ 8:07 pm

Hi Brandy, I do believe this will minimize movement and disturbances from one sleeper to the other especially if they don’t share a king size bed frame, instead using two twin bed frames. A swing hinge kit is also something you may want to look into they are cheap and add a world of convenience in the day to day use of such beds. In order of popularity of bed linen choices and how people dress them: Split King Sheets are a popular choice, then king size sheets, and then twin extra long sheets with a king bed spread. May your sleep be undisturbed. Doug ;-)

Comment by Douglas Belleville — July 31, 2014 @ 8:08 am

Thank you so much Doug for all this helpful information.

Comment by Brandy Watson — August 6, 2014 @ 8:17 pm

Brandy, You are very welcome.

Comment by Douglas Belleville — August 12, 2014 @ 2:48 pm

I have a king top mattress and 2 twin box springs on a king swing bed frame.
Will this cause the mattress to sag in the Area where each person sleeps? Will a different frame make a difference

Comment by Kathi — October 23, 2014 @ 8:03 pm

Kathi, No and not necessarily. It would just depend on the quality and support of your current frame. It would have nothing to do with the swing hinge feature. Doug

Comment by Douglas Belleville — October 29, 2014 @ 8:44 am


Comment by gina — November 24, 2014 @ 6:55 pm

Hi Gina, To my knowledge there is no such thing as a king frame that attaches to a queen headboard, I would have to say there is rarely ever an inquiry for such an animal. In addition to that the 16 inches of difference between them is simply too much to simply hide. If you are still thinking of doing this there are a couple of companies on line that make modification brackets that modify a queen to fit a king or reverse they just aren’t pretty ;-) Doug

Comment by Douglas Belleville — December 1, 2014 @ 7:21 pm

Hi Doug…..I am considering buying two twin E.L. boxsprings to place a king size mattress on. Is this the proper way to do this?

Comment by Joy — January 2, 2015 @ 12:20 pm

Joy, You got it. You should be able to pick those up just about anywhere. Thnx Doug

Comment by Douglas Belleville — January 15, 2015 @ 4:48 pm

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