Mattress/Bed Sizes and Dimensions

Size Dimensions (in) Dimensions (cm)
Twin 38" x 75" 96.5cm x 190.5cm
Twin XL 38" x 80" 96.5cm x 203.5cm
Full 54" x 75" 134.5cm x 190.5cm
Queen 60" x 80" 152.5cm x 203.5cm
King 76" x 80" 193cm x 203.5cm
California KingCal King 72" x 84" 183cm x 213.5cm

A new mattress is a big investment, and the last thing you want to do is buy one in a size that you’ll be unhappy with in a year or two. Before you decide on a new mattress, take some time to think about what you’ll need to be comfortable for the next eight to 10 years. Consider your current mattress or bed—maybe you resent the way it takes up your entire bedroom, or you and your partner have been struggling with a lack of individual space—then take a look at our in-depth breakdown of mattress sizes. We outline the differences between both common and uncommon mattress & bed sizes and discuss key factors like bedroom size and dimensions, whether or not you sleep with a partner, and potential lifestyle changes so that you’re equipped to make an informed decision when you’re ready to buy. From FAQs to bed measurements, find all of the info you need to pick the right mattress or bed size below.

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All you need to know about mattress sizes & dimensions

Twin Size Mattress Dimensions

38" x 75"

Also known as “single” mattresses, twin mattresses measure 38 inches by 75 inches and fit one child or adult sleeper. Twin beds save space and comfortably accommodate growing children, but many adults and taller adolescents find that the limited space they offer isn’t enough. If you’re shopping for a daybed or bunk beds, most are designed to fit with standard twin mattresses, and a twin’s economical size suits it well to small or oddly shaped bedrooms. Though not the standard size for a dorm room mattress, a twin mattress is both economical and easy to move, so it also works well for less permanent living situations.

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Twin XL Size Mattress Dimensions

38" x 80"

A hallmark of college dorms everywhere, the Twin XL mattress provides 38 inches of width and 80 inches in length to students and growing adolescents. Its economical cost and practical size make it a popular choice for taller sleepers looking to save space without sacrificing sleep quality with a twin. While bunk beds and daybeds are more commonly made for standard twin mattresses, a Twin XL is still a great choice when outfitting a small guest room, a shared kids’ bedroom, or of course, a college dorm room. Far easier to maneuver than larger sizes, a Twin XL might continue to serve your college student after graduation.

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Full Size Mattress Dimensions

54" x 75"

Measuring 54 inches by 75 inches, a full size mattress offers sleepers a noticeable fifteen inches of additional width compared to a twin bed. Adults and growing kids will have more space to stretch out and move around at night with the extra inches, but the full mattress is still best for single sleepers. Though a lower price tag and added space may be tempting for couples, sharing a full bed with another person gives each sleeper only a crib’s width of space, which isn’t ideal. For larger bedrooms, first apartments, and teens who have outgrown their bunk beds, a full mattress represents an excellent upgrade.

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Queen Size Mattress Dimensions

60" x 80"

The queen mattress is the most popular mattress size in the US right now, and its dimensions—60 inches by 80 inches —give both singles and couples alike the space they need to sleep comfortably. Most standard bedrooms and doorways can accommodate a queen mattress without compromising walking space, and queen mattresses are more affordable than king mattresses and beds in specialty sizes. These factors, as well as the wide availability of queen mattresses, accessories, and bedding, make the queen bed a versatile choice that many sleepers feel grows with them through moves and other life changes.

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King Size Mattress Dimensions

76" x 80"

With generous dimensions of 76 inches of width by 80 inches in length, king size mattresses give couples a luxurious amount of individual sleeping room. If you and your partner share your space with young children or pets on occasion and don’t want to compromise space, a king size mattress is the best choice, and will give you each the same amount of room you’d have on a twin XL mattress. Unlike some specialty mattress sizes, king size mattresses are widely available, so they’re easy to outfit with accessories like split boxsprings (for narrow staircases), headboards, and sheets.

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Cal King Size Mattress Dimensions

72" x 84"

For taller sleepers who crave space to stretch out each night, the California king mattress provides 72 inches of width and an expansive 84 inches of length to individuals and couples. Four inches slimmer than a conventional king mattress, a Cal king may be easier to accommodate in certain bedrooms, but it still gives couples almost the equivalent individual space of a twin XL mattress. If you’re looking for the right mattress for an adjustable bed, a California king is an ideal choice. You’ll barely notice the slimmer width compared to a traditional king, and you won’t have to sacrifice length when your head or feet are elevated.

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What's the difference between a twin and single mattress?

The words “twin” and “single” are often used interchangeably to describe the same size mattress, but there is no difference between the two. While “twin” is considered the standard name in the US for a mattress that measures 38 inches by 75 inches, other parts of the world favor the term “single” for a bed with the same dimensions. Wherever you go, 38” x 75” is the standard size for a bed designed for one person.

Is a full size bed the same as a double?

Yes, full size beds and double beds are the same thing. Both terms refer to mattresses measuring 54 inches by 75 inches. Though the word “double” would suggest that a full or double bed is twice the size of a twin/single mattress, that’s not the case. A full mattress is 15” wider than a twin bed, but the same length. Double and full can still be used interchangeably, but double is an older term and mattress manufacturers have mostly replaced it with the word full.

Is there a difference when describing the sizes of beds versus mattresses?

For the most part, no. Bed and mattress are terms used interchangeably for one another, but bed can sometimes suggest a set instead of a single mattress. The term bed could mean a mattress and boxspring, or mattress, bedframe, boxspring, and headboard. It’s unlikely a manufacturer would list dimensions that included accessories, because their sizing isn’t standardized, and most mattresses can be paired with a variety of compatible accessories, and generally aren’t sold as sets.

What size mattress do two side-by-side twin beds make?

Technically, two twin beds are just two twin beds. However, at 38 inches by 75 inches, two twin or twin XL beds provide close to the amount of space of a king or California king mattress, which measures 76 inches wide by 80 inches long. Conveniently, these close measurements allow manufacturers to support king and California king mattresses using two side-by-side twin or twin XL boxsprings, so customers don’t have to worry about trying to drag a 76” x 80” boxspring—which won’t bend the way a mattress will—up a flight of stairs to a master bedroom.

What about the other sizes of mattresses, like Texas or super king?

In addition to standard mattress sizes, over the years, several “specialty” mattress sizes have been created. Not widely sold and often only made by certain manufacturers in a small selection of models, these mattress sizes may be worth exploring if you don’t feel standard options serve your needs. However, note that as a result of their rarity, specialty mattresses can be difficult to find accessories and bedding for, so factor that into your decision before you buy.

Alternative Size Standard Size Dimensions
Single Twin 38" X 75"
Three Quarter - 48" X 75"
Double Full 54" X 75"
Olympic Queen - 66" X 80"
California Queen - 60" X 84"
Supreme Queen King 76" X 80"
Eastern King King 76" X 80"
Super King - 80" X 80"
Texas King - 80" X 98"
Wyoming King - 84" X 84"
Alaskan King - 108" X 108"
Size Name Single
Standard Size Twin
Dimensions 38" X 75"
Size Name Three Quarter
Standard Size -
Dimensions 48" X 75"
Size Name Double
Standard Size Full
Dimensions 54" X 75"
Size Name Olympic Queen
Standard Size -
Dimensions 66" X 84"
Size Name California Queen
Standard Size -
Dimensions 66" X 84"
Size Name Supreme Queen
Standard Size King
Dimensions 76" X 80"
Size Name Eastern King
Standard Size King
Dimensions 76" X 80"
Size Name Super King
Standard Size -
Dimensions 80" X 80"
Size Name California King
Standard Size -
Dimensions 72" X 84"
Size Name Texas King, Grand King
Standard Size -
Dimensions 80" X 98"
Size Name Wyoming King
Standard Size -
Dimensions 84" X 84"
Size Name Alaskan King
Standard Size -
Dimensions 108" X 108"
Is a full size bed big enough for 2 people?

It depends. A full mattress provides each person with 27 inches of space, which is the equivalent width of a crib. If you’re considering a full bed because you have limited space or budget constraints, test one out with your partner and decide if the sacrifice in personal space and length makes sense. For shorter sleepers, it might, but taller sleepers may find a full bed’s 54 inches insufficient. Mattresses aren’t one size fits all, so focus on what size will work best for you.

What’s the most popular mattress size?

The most popular mattress size in the US is a queen. For many, the queen mattress balances adequate space for two people with a size that’s easier to move through narrow doorways and staircases. It also strikes a middle ground in terms of budget compared to pricier king mattresses. Don’t let the masses determine what size mattress you buy though—do your research and always consider the factors that matter most to you before you make a decision.

What’s the largest mattress available?

If you thought a traditional king was big, think again. The largest mattress size on the market is appropriately named the Alaskan king, measuring an opulent 108” x 108”. If you have the space for this mattress size, you and your partner will each enjoy 54 inches of space—the equivalent of an entire full mattress—to yourselves. Looking for more space but not sure the Alaskan king is for you? Read more about why switching to a traditional king might be the right choice instead.

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