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mattress guides

All You Need To Know About Mattress Sizes And Dimensions

mattress sizes explained

Choosing the right size of the mattress may seem deceptively simple, but it is a time-consuming process. The number of sizes is just overwhelming, and each of them has its obvious benefits, as well as not so obvious disadvantages.

Below, we explain everything about the mattress sizes, including the smallest nuances, and provide sizes chart — this will help you pick a mattress that would be perfect for you personally. But let us take a look at the sizes available on the market first and then move on to the more detailed analysis.

mattress sizes and dimensions sizes guide

Mattresses for kids, adults, couples — all mattress sizes chart

There are 10+ existing sizes of the mattresses in US. Let’s take a look at all of them in the chart — this will make sizes comparison so much easier.

The most common mattress sizes chart

Let’s consider the most common or standard sizes first. Note: all sizes come in width & length order.

NameCribSmall SingleTwin SizeTwin XL Size (TXL)Full SizeFull XL SizeQueen SizeOlympic QueenKing SizeCalifornia King Size
Size in inches27.25” x 51”30” x 75”38” x 75”38” x 80”54” x 75”54” x 80”60” x 80”66” x 80”76” x 80”72” x 84”
Size in cm69.2 cm x 129.5 cm76.2 cm x 190.5 cm76.2 cm x 190.5 cm96.5 cm x 203.5 cm134.5 cm x 190.5 cm137 cm x 203.5 cm152.5 cm x 203.5 cm167.5 cm x 203.5 cm193 cm x 203.5 cm183 cm x 213.5 cm
Works forA babyA child (especially if the bedroom is quite small)An adult or a child (is too narrow for couples who sleep together)An adult or a child (is too narrow for couples who sleep together)All types of adult sleepers (doesn’t work good enough for couples)Great for a big sleeper and perfect for couples looking for some extra legroomMost popular size for couples and single sleepers looking for a lot of roomBigger than a Queen, smaller than a King, great for couplesIconic size, perfect for couples looking for some extra room & personal space4 in narrower but 4 in longer than King, great for taller people

The rarest & the biggest mattress sizes

California King Size & King Size were created for couples looking for a lot of personal sleeping space. But is there anything bigger? Yes, there are a few more sizes, which, however, are not so easy to find on the market and buy, even if you hope to purchase it in a huge mattress store. That’s why people often pre-order them in online stores. So, what are the bigger-than-the-biggest sizes?

  • Texas King — 80 in x 98 in (203 cm by 249 cm)
  • Wyoming King — 84 in x 84 in (213 cm by 213 cm)
  • Alaskan King — 108 in x 108 in (274 cm by 274 cm)
biggest mattress sizes

Let’s compare mattress sizes, the biggest ones, to be exact. As you can see, California King is really big and suitable for up to three people, for example, a mom, a dad, and a child. Texas, Wyoming, and Alaskan Kings, however, are also great for 4 people, a mom, a dad, and two kids. Note that Alaskan King is the biggest mattress of the market — you won’t find anything bigger, unless it’s a custom-made mattress.

More about each mattress size

As you can see, the number of options is more than just impressive. That’s why we divided all of them into three main categories: kids mattresses, mattresses for single sleepers & mattresses for couples, and described all their features. Use this info to find the mattress that’d be ideal for you, your kid, you & your spouse personally.

Kids mattress sizes

What are the kids’ mattress sizes and what’s the difference between them? Let’s take a look.

Crib size — 27.25” x 51”

crib mattress size

It’s 27 and ¼ inches in width by 51 and ¼ or 6 feet by 4 feet, and it’s not the standard that can be easily changed. This is the norm regulated by the government, so you’ll hardly experience any difficulties when looking for sheets that fit the mattress. Still, there's a small variation of ⅝ inches to consider. Make sure that no more than 2 fingers should exist between the frame and the mattress. Please also note that baby cribs shouldn’t be more than 6 in thick.

Small single size — 30” x 75”

small single mattress size

This is an ideal mattress for a baby and toddler, especially if an area of a bedroom is pretty small, and you need more playing space.

Mattresses for single sleepers (adolescents & adults)

Twin size — 38” x 75”

twin mattress size

Though it may seem that the word “twin” means that this very mattress is for two people, twin mattress was initially created for single sleepers — children besides babies & toddlers, and adults. They’re quite small and pretty cheap, and allow making some extra space in a bedroom. However, there’s no denying that Twin is too short for tall people, so many adults still prefer to buy larger mattresses.

Twin XL Size — 38” x 80”

twin xl mattress size

Basically, it’s like a twin size bed, but XL size is 5 in longer, and it’s matter — this is what makes XL mattress more suitable for adult single sleepers (close to 6 in, to be exact). Still, it’s also great for people who have small bedrooms — they can add some extra legroom without losing a lot of space in the bedroom. They also last long, and the price is pretty low.

Best mattresses for couples

Full Size — 54” x 75”

full mattress size

Full size aka Double mattress is one of the common options on the market. The reasons are simple: it fits two people (if they are not too tall and too demanding), is relatively cheap, and doesn't take up too much space, and you’ll hardly experience any difficulties when looking for a full-size mattress in a local store or online shop. Americans often buy such mattresses for growing children and single sleepers because it’s a quite cost-effective option. Some couples who have quite small bedrooms also purchase them, but there’s no denying that there are better options for two.

Full XL Size — 54” x 80”

full xl mattress size

Full XL size mattress is a bit narrower than a Full Size one but it’s significantly longer. Thus, it’s better for taller people, it’s relatively small (in particular, in comparison with Queen and King beds), and the number of brands that produce such mattresses is just overwhelming, so you won’t face any difficulties when looking for a top Full XL mattress. Still, as we mentioned, it’s even narrower than Full Size, so it might be ideal for couples who love being a little spoon & a big spoon but not so good for people who value personal sleeping space.

Queen Size — 60” x 80”

queen mattress size

As we’ve noted before, it’s an iconic size. It’s a kind of perfect option for couples, an ideal combination of length, width, comfortable room for those who are in love and space for individuals who appreciate some personal space (you can sleep without bothering anyone and without being bothered). All, literally all brands offer Queen Size. And it works for a single adult who needs some extra space for a child or a pet (or just likes a luxurious lifestyle) too. Still, it hardly fits a couple with a child — if you’re three, you’ll need a King.

Olympic Queen — 66” x 80”

olympic queen mattress size

In short, it’s wider than the Queen mattress. Some may say that 6 inches don’t really change anything, the quality of sleep, to be exact, but they matter. It may be a bit difficult to find a seller that has this size, but some couples think that this size is worth every effort.

King Size — 76” x 80”

king mattress size

It’s twice bigger than a Twin, and it definitely deserves to be called the “King” — this mattress is considered one of the most comfortable mattresses for families. A couple will enjoy hugs and good sleep — you won’t bother anyone sleeping on such a huge bed. Paradoxically, the only significant disadvantage of the “King” is its size — it fits only in a really big bedroom (at least 12 ft x12 ft.) Still, most couples who’ve already purchased it note that they don’t want any upgrade, so such a big purchase can save money in the future. Of course, there are a lot of high-end and cheaper options on the market.

California King Size — 72” x 84”

california king mattress size

Yes, even the King is not enough for some couples who appreciate some extra legroom most. It’s not much bigger (in fact, it’s even a bit narrower) than the classic King size mattress but it’s significantly longer. And yes, it takes up a lot of space in the bedroom and it’s not so broadly available, but for some people, it’s still worth it.

What should I consider choosing the mattress of the right size?

So, now you know more about the mattress sizes and dimensions and their features. Basically, the latter ones are the answer to the question, “Why do we need so many sizes at all?” Some of them are longer, some narrower, and some wider. Some are great for toddlers, some — for the family of three, and some — for the family of four. But frankly, in most cases, this is still too broad info to choose the right size easily. That’s why we recommend you take a look at the specific criteria to consider.

couple measure mattress for room

Area of your bedroom

Yes, it seems pretty obvious, but you need to measure your bedroom before you start to look for a mattress. However, measuring it and finding out that “it’ll fit” are not enough. Think about all the stuff in your bedroom. Will the King size really fit you? After all, people also need some space around the bed, for a dressing table, chair, mirror, etc.

Here are the minimum room sizes for all the most popular mattresses:

  • Small Single Size — 7 ft x 10 ft
  • Twin Size — 7 ft x10 ft
  • Twin XL Size — 8 ft x 10 ft
  • Full Size — 9 ft x 9.6 ft
  • Full XL Size — 9 ft 6 in x 10 ft 6 in
  • Queen Size — 10 ft x 10 ft
  • Olympic Queen — 10 ft x 10 ft
  • King Size — 12 ft x 9 ft 10 ft
  • California King Size — 12 ft 2 in x 11 ft

Of course, you’ll need even more space than 12 feet by 11 feet for extra big mattresses like Alaskan King.

Who’s going to sleep on this mattress?

This is another crucial thing to consider. Are you going to sleep on this mattress with your kid? With your spouse? With your kid and your spouse? With your spouse and two kids? With a pet? Just check the info above and take a look at the pics once again (also, you might want to check all types of mattresses). Which of the options suits you best?

How you’ll move it?

Consider the architecture. Moving the biggest and the biggest of the biggest mattresses, for example, to the second floor will be impossible if your stairways aren’t wide enough. Think about moving mattress, too.

The price range

Some sizes are available on the market in lots of forms and variations. This means that you’ll find the not too expensive Queen Size mattress without much difficulty. Some sizes, however, are rare, so the price range isn’t so wide. Weight the pros & cons of all options that seem to suit you.

Final thoughts

There are plenty of things and nuances to consider. For example, California King is considered as the biggest size, but it’s not exactly true. A Queen bed size is one of the best options for couples, but it has some significant cons, too. The same can be said by all other sizes — there are plenty of factors, and all of them were described before. We recommend taking into account all of the above to make a choice that’d be ideal for you personally.


What’s the smallest mattress on the market?

Factually, it’s Crib - mattress for a baby. The next smallest mattress is the Small Single size and the Twin Size respectively - these are mattresses for kids too (though some people who aren’t very tall can choose Twin size). Adults should consider Full sizes to sleep with comfort.

What’s the biggest mattress in the US?

It’s Alaskan King which is 108 in x 108 in.

Is the Full Size a good option for a couple?

If you dream of a mattress that would allow you to sleep without even touching each other, that’s not the best option. It’ll hardly suit you if someone is taller or bigger than the average person. But if you are average in a good way, and if you like hugs, it might work for you.

What’s the difference between the Full Size and the Double Size?

There’s no difference between them. They’re both 54 in by 75 in.

Do two Twin mattresses equal the “King”?

No, they aren’t. But two Twin XL mattresses are.