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Mattress Dimensions: How to make the right choice?!?
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Mattress sizes and mattress dimensions guide by Polysleep


Mattress Dimensions: How to make the right choice?!?

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What are standard mattress sizes?


There isn’t just ONE size of mattresses, but MANY, and each corresponds to a particular sleeper situation!

Let's briefly summarize mattress sizes below, and when to choose them:

  • Twin mattresses (38” x 75”), are perfect for kids, but also for adults that live in a small space, such as a student apartment for example.
  • Twin XL mattresses (38” x 80”), are ideal for taller students and teen bedrooms.
  • Full mattresses (54” x 75”) are especially suited for single adults with or without pets, and for teens that sleep diagonally across their bed.
  • Queen mattresses (60” x 80”), are an alternative of choice for tall adults, couples who want more space and single people that sleep diagonally or accompanied by their animal companion, for want of anything better.
  • Olympic Queen mattresses (66” x 80”), wider, provide more room for the occupants, and allow enough space for a couple to welcome their pet, for those who don’t want to invest in a King bed.
  • King mattresses (76” x 80”) for their part, offer a more sizeable space for you, your spouse and your large family pet. They’re perfectly suited for larger master bedrooms (measuring, ideally, 12’ x 10’).
  • California King mattresses (72” x 84”), are mainly intended for couples that are taller than average, or if who love to have an enormous space for yourself, your spouse, and all your cats and dogs. A must have, as long as your bedroom is large enough.


Mattress Thicknesses based on the Sleeper’s Weight:


  • For sleepers of less than 130 pounds: the mattress thickness can be equal to 10 inches or less.
  • For sleepers of 130 to 230 pounds: for acceptable comfort, the mattress thickness can be between 8 to 12 inches. But a lot of these sleepers will prefer a thickness that rather lies between 10 and 12 inches.
  • For sleepers weighing over 230 pounds: the thickness for these sleepers with a more substantial stature should be at least 11–12 inches. But the majority of them will favor a mattress thickness of over 12 inches.


Mattress sizes explanation:


We’ve already created a guide about bed sizes to help you choose yours. You must be asking yourself: “Why read this guide from Polysleep that talks about mattress sizes? They’re repeating themselves, right? Isn’t that the same thing?”.

Well… no, it’s not the same thing. The bed is the support on which your mattress will be placed, and that’s why bed sizes are very similar to mattress dimensions.

So, unless you’re thinking about sleeping on your boxspring and don’t want to learn all the criteria to consider before buying the right size of mattress, this guide is made for you!

Don't waste any more time and start to read if you want to make the choice that’ll change your sleep forever! (Ok, ok, we’re exaggerating a little, but still!)

A couple sleeps peacefully on their Polysleep Mattress

“Without the right mattress size, never well will you sleep!” (Master Yoda, The Empire Strikes Back, or Not)


Well. The great Jedi Master might not have said those words exactly, but this principle is still really important. The size of a mattress is as crucial as the materials used in its manufacture, whether it's made of pocket springs or foam and this, no matter the type of foam.

For example, a mattress that is too small for you, and eventually your significant other, can cause serious inconveniences including, just to start, an inadequate sleep position. If you’re taller then said mattress, your legs and/or your head could eventually end up hanging over nothing, which can cause additional stress on the pressure points your mattress should relieve, and you risk waking up stiff with sore muscles, even joint pains. Your muscles won’t have enjoyed optimal rest during your sleep, same thing with your bones, and you could then wake up in the morning with some physical tiredness. Sleep should be for resting, not to feel more tired!

You should also consider the number of occupants in your bed at night, whether you’re single with a cat (or two, or a dog), or whether a significant other was added to your situation. It goes without saying that opting for a Twin mattress when your other half sleeps with you is almost suicide! And if on top of that, the cat tries to hoard its own space… goodbye rest, or hello lack of it!

And so, you will have to take into consideration the space required for every passenger before your departure to dreamland, so that everybody has enough personal space (cat included). That’s how you’ll avoid any involuntary night-time domestic violence from your partner or your feline, such as an unintended slap from them when they’ll move during their sleep.

What is more, if you’ve chosen a bed that’s too small for your couple, you’ll be crammed together, which can reduce your bed’s capacity to disperse heat. As much as this can help if there’s no heat during winter or if you like sauna-type temperatures, this can become troublesome in summer when the mercury rises. You and Mr. (or Ms.) will die from the heat. It's safe to say that you should choose the size of your mattress with this fact in mind.

Finally, you should choose your mattress, just like you did for your bed, based on the size of your bedroom. Of course, to sleep in your room, you should first be able to enter it! Too large of a bed in a small room won’t fit. And even if it does, you won’t be able to freely move around like you need.

Two kids are playing with their parents and jumping on the Polysleep Mattress

“But then, Master Yoda, how do I choose the size of my mattress?” (Luke Skywalker, The Empire Strikes Back, or Not)


“Help you, I will”, would have said the great Force Master if a movie episode about beds existed. We’ll do it in his place here below. Just like with beds, there are various standard sizes of mattresses. We’ll present them below with their dimensions, and on top of that we’ll indicate the situations they’re best suited for. You’ll then be able to choose the size of your mattress with full knowledge of the facts!


Twin Mattress


Measuring 38” x 75”, this mattress is above all intended for children and young adults. In that sense, this mattress is perfectly suitable for single people and students, who often live in apartments or share one. So the Twin is appropriate for bedrooms with limited space, from 7 x 10 feet.

On the contrary, if you’re tall and/or you live with a spouse, just forget this solution right away, unless you like to sweat or sleep on top of one another (you never know!), or if you spread out when you sleep.


Twin XL Mattress


This type of bed features an increased length compared to its standard counterpart, and culminates at 38” x 80”. It’s the dream mattress size for university students, one that you’ll most often see in post-secondary dorm rooms. It can always be installed in a confined space while offering more length for those who are taller. It’s also the ideal solution for a teenager’s bedroom.

So, this size is suited, just like its standard counterpart, for student apartments and apartment sharing. It is, however, by no means appropriate for couples and for those who occupy the whole bed when they sleep.


Full (or Double) Mattress


This mattress, presumably for two people, isn’t in fact for two. In truth, it only provides one more inch in width compared to the two types of Twin mattresses mentioned above. It was the standard in use for couples’ beds several decades ago, when houses were built with smaller bedrooms. This format is now used to accommodate single adults and teens that really want to spread out on the whole bed when they sleep.

So it’s perfect for all kids, teens or adults who want more personal space, or who sleep in the company of their pet. Or couples that like to cuddle when they sleep and aren’t afraid to raise the temperature.

But it’s not a size recommended for couples who require a certain personal space to spread their legs or who move around a lot, for taller adults or for couples who can’t sleep without their cat (or their dog). A full mattress measures 54” x 75”.


Queen Mattress


The Queen mattress is actually the most popular in terms of sales, and that makes sense: it offers a greater length for tall adults, and significant additional width, so that couples can cuddle while sleeping, if they want, while also giving each of them more personal space to move during the night.

This mattress, measuring 60 inches in width for 80 inches in length, is also perfect for single adults who like to spread out on the whole bed surface, or who want the company of their pet at night, and for couples that want to sleep near each other, but without their cat or their dog.


Olympic Queen Mattress


Wider by 6 inches than a standard Queen mattress for an equivalent length (66” x 80”), the Olympic Queen mattress offers more room for each of its occupants, and even allows to add your dog or your cat to the equation, without having to invest in a King size mattress. So it's the best of both worlds!

This way, if having more personal space is important for you as much as for your spouse, the Olympic Queen is a mattress size to consider, the same if you like to sleep with a mountain of pillows, which undoubtedly will take more room. It’s also an especially suitable mattress if your room is greater in width than length, but there's not enough space to fit a King mattress in it.


King Mattress (76” x 80”)


This type of mattress is the equivalent in size, let's recall, of two Twin mattresses placed side by side. Just to say that with a King, you, your spouse and your rottweiler will sleep in unparalleled comfort! To be sure, King mattresses offer more than enough personal space for each of its occupants, on two legs as much as on four legs. It's perfect for a larger master bedroom (ideally 12’ x 10’).


California King Mattress


This mattress format is actually the same size as two Twin XL mattresses placed side by side. It measures 72 inches wide for 84 inches long. It's particularly appropriate if your couple is taller than average, or if you like to enjoy a lot of personal space. It’s also perfectly suited if you want to spend your nights with all your furry friends, whether dogs or cats. It’s the cream of the crop, as long as your bedroom is large enough to fit one!

The Polysleep Mattress size in a room

“We’ve talked about length and width, but what about bed thickness, Master Yoda?”


“Coming to it we are, my young Padawan!” So, ok, we’re putting words in Luke and Yoda's mouths, but there's no doubt that they’d come to it if they’d talk about mattresses. More seriously, There is a misguided notion that the larger the mattress, the thicker it should be. That's false, since most models actually for sale propose the same thickness no matter the size of mattress selected for a given model. Which, however, doesn’t prevent some manufacturers from offering various thickness options for all sizes of a mattress model!

While mattresses are available in thicknesses ranging from 6 to 18 inches, most of them have a depth of 8 to 12 inches. To choose the right thickness for you and Ms. (or Mr.), you have to take into account both of your weights. On that basis, sleepers are divided into three categories of weight, with each their recommended mattress thickness.


Lightweight Sleepers (130 pounds or less)


Lightweight sleepers, weighing less than 130 pounds, will prefer a mattress with a thickness of 10 inches or less, because it’ll offer adequate support without them sinking too much into the mattress.


Average Weight Sleepers (130–230 pounds)


Sleepers with an average weight (between 130 and 230 pounds), for their part, will be comfortable on mattresses with a thickness of between 8 and 12 inches, although most of them will prefer a thickness that lies between 10 and 12 inches. These thicknesses really provide the perfect balance between comfort and support for most sleepers.


“Schwarzenegger” Sleepers (or rather Heavy Sleepers, sorry!)


For heavier sleepers (230 pounds and more), a minimum thickness of 11–12 inches is essential, but most of them will prefer a thickness superior to 12 inches. These mattresses with increased thickness will not flatten out under their weight and offer all the support required by their non-standard stature.

A woman sitting cross-legged on her Polysleep Mattress stretches her back



As you’ll have understood, choosing the right size of mattress is far from easy, and corresponds above all to very specific factors based on body shape, the number of bed occupants and the size of the bedroom.

If you want a summary of the information presented in our guide, please scroll up to the top of this page!


If you enjoyed reading our article, if you learned something and want to help a friend, or if you think this article could give valuable information to someone else, please don't hesitate to Share by clicking the button below!


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