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We have an affiliate relationship with and receive compensation from companies whose products we review on this site. We are independently owned and the opinions expressed here are our own.
We have an affiliate relationship with and receive compensation from companies whose products we review on this site. We are independently owned and the opinions expressed here are our own.

Bed Size Dimensions

Jake Comfort  |  Updated: January 2024

Jake Comfort  |  Updated: January 2024

We have an affiliate relationship with and receive compensation from companies whose products we review on this site. We are independently owned and the opinions expressed here are our own.

There are plenty of things that you need to give careful thought to when you’re considering a new mattress. However, one of the things that you don’t want to spend too much time worrying about is what size mattress you need. That’s why we’ve put together this helpful guide so you know what you’re getting when you’re considering different bed sizes. We’ll cover the dimensions of the various sizes that mattresses come in, and give you some advice regarding what kind of mattress size is best for you given your circumstances and needs.


The bed dimensions are listed in order from smallest to largest, so if you know you need a bigger bed feel free to skip down.  Read on to learn all you need to know about bed size dimensions.

Bed Size Dimensions

Why It’s Important to Know Bed Dimensions

There’s a few different reasons why you’ll want to understand the dimensions of different beds. Beyond the obvious issues of making sure you fit on the bed, you also want to make sure the bed fits in the room.

For example, many people might find themselves choosing between a king and a queen mattress. One of the biggest factors in deciding which mattress is the best option has to do with how much floor space the bed will take up. After all, no one wants a situation where there’s nowhere to walk because the bed is taking up the entire room.

Additionally, getting a bed that’s too big for a room makes it hard, if not impossible, to get the bed where it needs to go. This is a serious concern, as ruining you bed by accidentally ripping or tearing it is bad. Additionally, contorting and twisting a mattress to get it to the room can ruin the structure of the mattress. This is especially true for modern memory foam mattresses.

In the same way, getting a bed that’s too small for a room can also be a problem. This can occur for people who are looking for a bed for a guest room and don’t consider what the room will look like with the bed. A twin or twin XL, or even a full mattress, can cause a room to look and feel empty and uninviting.

While this certainly isn’t the end of the world if you just need a bed or aren’t concerned with interior design, many mattress shoppers plan entire bedrooms around the bed. Therefore, understanding the size of different mattress options is essential to getting the look and feel that you’re going for.

Finally, knowing how your bed fits into the room will help you decide what options you have for bedframes. For example, you may choose to get a queen instead of a king mattress so you can get a platform frame that’s low to the ground. Getting a queen means that you’ll have more storage space in the room, as there’s no room under these types of beds to store things.

Additionally, understanding what options for bedframes you have will help you plan the rest of the room. Many people forget to calculate room for things like headboards or the foot of a bedframe. That can leave you with less open space than you planned, making the room feel tight, cluttered, and hard to move around in.

Twin Bed Dimensions

A Twin mattress is one of the most common mattress types. It is the preferred mattress for children and sometimes for guest rooms. A Twin bed is designed to sleep one person only, so it’s not a good idea for couples.

A Twin bed measures 38” by 75” (W x L). As a result, it’s the smallest of the adult mattresses on the market. This mattress size is best for a child who has outgrown the cribs and training beds that re used for toddlers and younger children. A Twin bed is also an acceptable option for a single adult. Twin beds are commonly the size of mattress you get in pieces of furniture like daybeds, bunk beds, and similar bed-inclusive items.

Most of the more popular mattress companies offer their products in a Twin size. As a result, you can usually get the benefits of a high-quality mattress, even if you’re sort on cash or space. It’s also a good option for people who have particular needs from a mattress and don’t have the cash on hand to buy a larger version of the mattress that has the properties they require.

Twin XL Bed Dimensions

A Twin XL is the second smallest mattress option for adults that is commonly available. Nearly all of the most popular mattresses come in a Twin XL form, so you can be reasonably confident about your ability to get the mattress you want in this size.

A Twin XL is the same width as a Twin bed, (38”), but it is 5” longer, bringing the full dimensions to 38” x 80”. It’s best for those that don’t have the budget or space for a larger bed, but require a longer mattress than a twin because of their height or other needs.

Something that should be noted is that it can be a bit more difficult to find sheets for a Twin XL, as not every major sheet manufacturer produces all of their products in a Twin XL size. However, in the age of the internet and online shopping, it’s certainly simple enough to find a set of Twin XL sheets that meets your budget.

Using Two Twin XL’s on a King Frame

In addition to being perfectly usable as a mattress on their own, sometimes people choose to use two Twin XL mattresses to fill a king size frame. This is a popular solution for couples with dramatically different sleep preferences or needs.

Moreover, two Twin XL mattresses are a good option for couples who want to get an adjustable bed frame. The benefit of this setup is that the sleepers can be in different positions, one sitting up and one laying down. This offers tremendous flexibility for those that have different sleep preferences or habits than their partners.

Bed Size Dimensions

Full Bed Dimensions

A Full mattress, also known as a standard double, is probably the most common size of mattress. You encounter these mattresses in hotel rooms that have two beds in them, many guest bedrooms, and more. They’re a fantastic option for children of most ages, as we discuss in our guide to finding the best mattress for children.

A Full bed can fit two people, but it will be a tight fit. The dimensions of a standard double are 54” x 75” (W x L). A Full mattress is an excellent option for single sleepers especially those who like to spread out while they’re sleeping, or sleep diagonally across the mattress.

For individual sleepers, the bed offers 54” of space, but for two people there is only 27” of width for each person. You’ll notice that amount of room leaves you with about 1/3 of the space you’d get from a twin bed. 27” is just over two feet long, so couples really will be squeezed tightly on the bed.

The length of a full bed is also an important consideration. While most of the population will fit on to the mattress comfortably, those who are 6 feet tall will only have 3” of extra space at the end of the bed. This presumes that the tip of your head is on the very edge on the other end of the mattress. As a result, some sleepers may find that they are too tall to comfortably sleep on a full, especially with another person.

Queen Bed Dimensions

A Queen bed is a popular choice for couples, especially those on a budget or who have space limitations. It’s currently the most popular mattress size for individual mattress purchases. As a result, you can be confident that, no matter what kind of mattress you want, it will be available in a queen.

Queen beds are 60” by 80” (W x L). Therefore, it can comfortably sleep two people, two people and a small child, two people and a small pet, or one person and a large pet. It’s also the preferred size for single sleepers who are especially active.

The Queen mattress needs a bit more real estate than a full bed, and it’s advised that you only purchase a Queen mattress if the room it’s going in is at least 10 ft x 10 ft. It’s recommend for couples, active single sleepers, and those who share a bed with children or pets. Moreover, a 6’ tall sleeper will have 8” of space, so it might be more comfortable than they would be on a full bed.

King Bed Dimensions

A King bed is the second largest commercially available bed. A King mattress measures 76” by 80” (W x L). These measurements mean that each partner in a couple gets 30” of sleeping space, which is 8” less than you get from sleeping as an individual on a Twin mattress. However, it’s much more space than you get from either a Full or Queen mattress.

A King bed is ideal for couples, sleepers that really like to sprawl out on the bed, or those who share a bed with children or pets. In order to fit a King mattress in your room and leave enough space to get around and have the other items of furniture you’d want in a bedroom, your room should be at least 12’ x 12’.

Bed Size Dimensions

Split King Bed Dimensions

A Split King is an excellent option for couples who have dramatically different needs from a bed. It uses two Twin mattresses, so each sleeper gets 38” of width to enjoy. This is the best choice if your sleeping needs are radically different from your partner’s needs. The two Twin mattresses that make up a Split King can have incredibly different properties. For example, one side might be very firm and the other side might be extra soft. This arrangement means that everyone can get the mattress they want or need.

California King Bed Dimensions

The largest type of commonly available mattress is a California King. This bed measures 72” by 84” (W x L). These dimensions make this bed the best option for sleepers who are exceptionally tall, or those who want to have the maximum possible space to lay on.

It’s important to note that while the California King is longer than a standard King, it is also narrower than a Standard King by 4”. Therefore, it is not the best option for couples that are looking to have the most room to sleep individually, or those with exceptionally wide frames.

What Size Mattress Do You Need?

In order to figure out what size mattress you need, you must account for the size of the room, who will be sleeping on the mattress, and the individual’s sleep preferences. We’ve put together this handy chart to help you quickly determine the best mattress for you.

When you’re considering the bed you need, it’s important to keep in mind the other furniture that you’ll have in the room. While it may not seem like a few inches is a big deal, it’s really difficult to add more space to a room. Therefore, we recommend you use the measurements from our chart, combined with measurements you take of your room and the furniture, when you’re considering what size bed you need. Also, don’t forget to plan for the dimensions of your bedframe when you’re considering bed sizes to ensure that your bedroom has the exact look and feel you’re going for.

SizeDimensionOptimal For
Twin38″W x 75″LToddlers, Children, Single Adults
Twin XL38″W x 80″LChildren, Single Adults (tall), Sleepers who want to use an adjustable bed frame
Full (Double)54″W x 75″LChildren, Single Adults, Single Adults with Children or Pets, Couples (small)
Queen60″W x 80″LSingle Adults, Single Adults with Children or Pets, Couples
King76″W x 80″LCouples, Couples with Children or Pets
Split King(2) 38″W x 80″LCouples (with varying mattress preferences), Sleepers who want to use an adjustable bed frame