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Twin Bed Dimensions: How Big is a Twin Bed?

The twin bed, also known as the single bed, was once America’s most popular mattress size. It’s a versatile and affordable option for many different bedroom setups and sleepers, ranging from toddlers to college students in the dorm. Today, it’s the second most popular mattress size after the queen mattress. Keep reading to learn more about this popular mattress size.

Twin Size Bed Dimensions

  • A standard twin mattress measures 38-inches wide (sometimes 39 inches).
  • Standard twin beds measure 75 inches in length, which is 5 inches shorter than the twin XL size.
  • The twin size is the smallest of all mattress sizes, outside of crib mattresses, which means it’s often geared toward younger audiences.
  • The twin-size mattress’ biggest challenge is its length — at 75 inches, it may be too short for taller teenagers or adults to sleep comfortably without their feet hanging off the end.
  • Because a twin’s compact size allows for multiple beds within a room, you might see a twin bed in some hotels and motels. This can help accommodate multiple people sleeping in the same room who don’t wish to share a bed.

Benefits of a Twin-Size Bed

Provides Flexibility and Versatility

The twin-size mattress can offer a sleeper a lot of flexibility and versatility. Twin mattresses also make good guest beds, daybeds or bunk beds, especially if you’re trying to maximize a small bedroom space. Twin beds are a nice option for narrow bedrooms — if you have kiddos who share a room, furnishing it with twin mattresses allows each of them to have their own bed without making the room feel too cramped. If you take it a step further and add bunk beds, then you can really save on space while increasing the fun factor.

Twin mattresses are also light and portable, so you won’t hurt yourself when it’s time to move. It takes a lot less effort to move a twin mattress than it does to move a king mattress.

Great for Growing Children

Twin beds are an ideal choice for children who have outgrown cribs, but who aren’t ready for the full expanse of a double bed or larger, which could feel “too big” to a little one. A twin mattress can stay with children well into their teenage years unless they are especially tall — in which case, the length of the mattress may become an issue.

For Singles or Couples

If you’re sleeping by yourself, a twin bed can offer plenty of comfort. As long as you’re not too tall, it’s an ideal choice for single adult sleepers, especially those who are on a budget or are looking to save as much bedroom space as possible. And if you’re sleeping with a partner, but you just can’t agree on mattress firmness, you can always take twin mattresses and put them side by side. Two twins are just as wide as a king-size mattress, though 5 inches shorter, allowing each sleeper his or her own personally tailored, ideal sleeping space at just the right level of firmness. To achieve standard king bed dimensions, you can put two twin XL mattresses together to make a split king.


Twin beds offer many other benefits, such as being very economical. They’re not a big investment, so they’re a great choice if you’re trying to save money, furnish a room for kids, or if you need beds for a lake house or cabin retreat.

Easy to Accessorize

Twin beds are also super easy to accessorize. Because of their popularity, it’s easy to find that perfect fitted sheet and mattress protector for your twin bed size dimensions. Bed frames, pillows, bed sheets, and duvet covers are widely available in a variety of colors, patterns, fabrics and price points, so it’s easy to find exactly what you want for a great night’s sleep. Twin size bedding and accessories are less expensive than bed linens for larger mattress sizes.

Before debating mattress types and the pros and cons of a memory foam, innerspring, or latex mattress, it’s important to first choose the size you need. Overall, the twin-size mattress is a solid choice for more petite sleepers, sleepers who are striving to be economical, or for people who are working within an extremely tight bedroom space.

Frequently Asked Questions about Twin Beds

Two people laying on twin size beds

Let’s take a look at some of the most common questions people have about the twin-size bed.

What size room works best for a twin-size bed?
One of the best things about the twin-size mattress is its versatility. If you’re working with any bedroom space that’s at least 7 x 10 feet, a twin bed can work for you. The larger the room size, the more flexibility you have for additional furniture like dresser drawers and nightstands. If you have a large bedroom space, though, you may want to consider a larger mattress size so that your bed doesn’t get completely dwarfed by empty space.

What’s the difference between a twin-size mattress and a full-size mattress?
A twin size mattress and a full-size mattress may have more in common than you think. Both mattress sizes measure 75 inches long — the difference in the two bed sizes actually comes down to width. The double bed is 54 inches wide, while a twin bed is 38-inches wide. So, a full mattress gives a sleeper 16 inches of extra sleeping width. Both mattresses are narrower, and 5 inches shorter, than the most popular mattress size, the queen.

Contrary to its name, the double bed is most often used for single sleepers since it can get cramped if you try to squeeze in two adult sleepers. It gives a single adult sleeper more room to sprawl out. Both twin size and full size bed dimensions can present challenges for taller sleepers if 75 inches is not long enough. Taller sleepers may find their feet hanging off the end of both mattress sizes.

Many sleepers have a hard time trying to choose between these two mattress sizes. The double bed provides more sleeping space, while the twin bed is more versatile and space-saving. One important consideration is the dimensions of the bedroom. If the space is too small, the width of a full bed can quickly overwhelm the space and make it feel cramped. In that case, a twin-size mattress might be the better option.

Is a twin bed and a single bed the same thing?
Yes, they are the same size. The difference in terminology refers to how the bed was originally used. A single bed is just what it sounds like – a bed for one person. The term “twin” comes from the practice of using this bed in pairs. For example, two twins were commonly used as separate beds in a guest room, children’s room, or even a married couple’s room. “Twin beds” were originally for two people to have the opportunity to sleep in the same room, but in different beds. The term “twin” simply designates that a single bed is being used as part of a pair. They’re twins – a matched pair.

Can two people sleep in a twin bed?
Maybe – but would they really want to? This is one of those situations where just because you can do something doesn’t mean you should. You could likely fit two sleepers in a twin bed, but their night’s rest would be terrible. The twin bed isn’t intended for multiple sleepers. It’s best suited for single sleepers who aren’t super tall. That’s why you’ll also hear the twin mattress referred to as a “single.”

Is the twin-size mattress the best choice for children?
Usually, but it depends. Both the twin size and the full-size mattress can be good choices for children, so just think carefully about the space you’re filling. The tighter the space, the more appropriate it is to use a twin-size mattress. Also, be sure to consider the sleeping needs of your child. Some young children can experience difficulty adjusting from a crib bed, and a twin bed can make it easier to transition to a larger bed.

Which mattress size is best for two kids?
You might be tempted to go with a full-size mattress for both kids to sleep together, but we’d recommend going either for twin size beds side by side or twin-over-twin bunk beds. That gives each kiddo her own space for sleeping, while also adding a sense of fun to the bedroom décor. If you’re dealing with a small bedroom space, stacking twin beds as bunk beds can help leave ample open space for playing. For a fun twist, if your kids invite lots of friends over, you can experiment with a twin bed over a full bed as a unique bunk situation.

History of the Twin Bed

Historical photo of people sitting in Twin size beds in the old days.

The twin-size mattress has an interesting history, especially in how it has been portrayed in movies and on television. Most TV shows and movies from the 1930s and 40s show married couples settling into their individual twin size beds at night. Remember I Love Lucy? While this sleeping arrangement was deemed appropriate for television, most married couples actually slept in the same bed. During the Victorian era, married couples did sleep in separate beds, largely because of hygiene fears. But by the end of World War II, this was a largely outdated custom.

But film and television censors insisted on only showing couples in twin size beds for many years afterward, a tradition that actually originated in Great Britain. American movie companies largely followed this practice, proclaiming “the treatment of bedrooms must be governed by good taste and delicacy.” This evidently translated to never showing a couple sharing a double or queen-size bed.

The first American film to show a married couple sharing a bed may have been 1944’s In the Meantime, directed by Otto Preminger. It’s unclear exactly when movies started showing married couples sharing the same bed, but at least by the 1960s, it was a fairly regular practice.

How Big is a Twin Bed?

When it comes to getting a good night’s sleep, the size of your mattress plays a key role. Usually, the more room you have to spread out, the better you sleep. But finding that perfect mattress size isn’t always as easy as it sounds, and you have to consider multiple factors, including your budget and the size of your bedroom.

When in doubt, a standard size twin mattress offers single-sleeper comfort without taking up a lot of room. It’s lightweight and easily transported if you move frequently. The twin bed is easy, convenient, inexpensive, and versatile — so unless you’re dealing with multiple sleepers sharing a bed, it’s almost never a bad call. Just think through the guidelines here as you choose your ideal mattress, and you should be in good shape. Sleep well!