Mattress Size and Dimensions

A Buyer’s Guide to choosing the right mattress size for you and your bedroom

Twin, Twin XL, Full, Queen, King, and California King bed dimensions

US Bed Sizes and Dimensions

Every mattress is different when it comes to the materials used, how soft or firm they feel; even the process of construction can differ quite a bit from bed to bed. In a side by side comparison, the most popular beds may seem to have more differences than similarities. Generally, however, they all share one common but very important factor in choosing the right mattress and that is the bed size and dimension.

In This Article

Mattress Sizing Chart

Mattress sizes and dimensions can vary considerably around the world so if in doubt it’s always best to reach out to a company directly for exact sizing. In the U.S.A, there are voluntary dimensional guidelines that are set by the International Sleep Products Association (ISPA) which means that in most cases a mattress will keep the same dimensions no matter where you purchase from (unless otherwise stated).

Mattress Sizes and Dimensions

Choosing Your New Mattress

So why does it really matter so much and what mattress size should you be choosing for your household? In many cases, bed size is a factor when it comes to fitting a new mattress into your space. You don’t want to end up making a room feel smaller than it is, but you also want a mattress large enough to accommodate your sleep needs.

Even if space isn’t an issue, going larger may or may not be the right choice. So, let’s talk about the standard US bed sizes and their dimensions to see who benefits most from each size. Choosing a bed size will depend on the following:

  • Space inside of the room
  • Body size & shape
  • Sleeping position
  • Single or shared

And of course, personal preference. While some couples may wish to sleep like kings and queens in a King or California King size bed, others may prefer the intimacy of having a Queen size mattress. On the other hand, those who sleep alone may enjoy the luxury of space a King size mattress provides. Still, others may find a King size bed much too big. Let’s break it down!

Twin Size Bed Dimensions

Best For Limited Space and Budget.

This is the smallest adult size mattress available and measures 38” W X 75” L. Twin size beds are most commonly used by those with limited space, but could also be suitable for a child that has simply outgrown their toddler mattress. Due to the size, it also makes it an excellent choice for those purchasing a mattress on a tighter budget.

This bed size is ideal for siblings sharing a room, bunk beds, guest rooms, and dorm rooms. The recommended minimum room size for a Twin size bed is 7 feet by 10 feet.

Twin Size Bed Dimensions and Mattress Sizing Chart

Twin XL Size Bed Dimensions

Best For Limited Space and Budget, Taller Folks.

The Twin XL shares the same width as the Twin size mattress but is 5” longer, measuring 38” W X 80” L. This is a great choice for those who are taller but don’t have space or the budget to go up a size to a Full size mattress. With a Twin XL, you won’t have to worry about your feet dangling off the edge of the bed!

Having exactly half the dimensions of a King size bed, 2 Twin XL’s can be combined on the same base or foundation to create a King size mattress. This makes the Twin XL an excellent choice for couples that have different feel and firmness preferences. For those using an adjustable base this is also a popular option if a Split King size mattress is not available.

The minimum room size for a single Twin XL mattress should be 9 feet by 9 feet.

Twin XL Size Bed Dimensions and Mattress Sizing Chart

Full Size Bed Dimensions

Best For Couples With Limited Space and Budget.

Full size beds offer a nice compromise between Twin and Queen size mattresses. Measuring 54” W X 75″ L they make a good choice for couples that don’t have a lot of space to spare or a single sleeper who prefers to roll around a bit more on a larger surface area. For some couples, this may still be considered a tight squeeze but could also be a great choice for those that like to snuggle or cuddle up with their partner.

Couples that opt for a Full size mattress will want to look for a bed that offers great edge support, allowing sleepers to utilize the full surface of the mattress and creating a more spacious feel. Innerspring and hybrid mattresses tend to offer better edge support than memory foam. At the same time, these mattresses typically provide better cooling and breathability which may be especially important when sharing such an intimate space.

The recommended minimum room size for a Full size bed is 9 feet by 9.6 feet.

Full Size Bed DImensions and Mattress Sizing Chart

Queen Size Bed Dimensions

Best For Couples, Medium Surface Area.

I like to refer to this as the happy medium, with dimensions measuring 60” W X 80” L the queen size bed is a nice step up from the Full size mattress. With a larger surface area, it is an even more popular choice for couples or solo sleepers who share the bed with pets or children. Larger individuals and/or those who prefer more room to move will appreciate the extra 6” in width that this mattress size provides.

The Queen is one of the most popular bed size purchases. Slightly larger than a Full size bed, the recommended minimum room size for a Queen size mattress is 10 feet by 10 feet.

Queen Size Bed Dimensions and Mattress Sizing Chart

King Size Mattress Dimensions

Best For Couples, Large Surface Area, Luxury.

The dimensions of a King size mattress are 76” W X 80” L making it one of the largest surfaces available for sleepers. A popular choice for couples who prefer a bit more room to spread out, a King size mattress is also an ideal choice for families, providing plenty of space for kids and/or pets to come and snuggle. Ultimately, whether you sleep solo or share your bed with someone else, a King size bed is sure to provide a luxurious sleep experience.

To comfortably fit a King size mattress the minimum recommended room size is 12 feet by 12 feet. This allows enough space for nightstands on either side and for easy movement around the bed.

King Size Bed Dimensions and Mattress Sizing Chart

Split King Bed Dimensions

Best For Couples With Different Sleep Preferences or For Those Using An Adjustable Base.

In many cases, a Split King is actually one bed with only the top half of the mattress split. This is an especially popular choice for couples that are using an adjustable base but who share the same feel and firmness preferences. The Split King allows sleepers to make independent adjustments to each side of the base. Having this adjustability, for example, can allow for one sleeper to sit upright for reading while their partner may prefer enjoying a zero-gravity setting.

The Split King can also be created by placing 2 Twin XL’s together to form a King size mattress. As we mentioned earlier, each Twin XL bed is equal to exactly half the dimensions of an Eastern King bed. This is a popular choice for couples who have very different sleep preferences and struggle to find one mattress to suit both sleeper’s needs. With a Split King, each sleeper can choose the bed that is best for them but still enjoy the experience of sleeping together. Ultimately, the Split King is all about customization and independence for each sleeper.

*If you don’t like the idea of a split down the middle of the bed, but still want a high level of customization, we recommend an adjustable air mattress. Also available in Split King options, adjustable air beds allow sleepers to independently adjust the firmness level of their side of the bed.

California King Size Dimensions

Best For Couples and Taller Folks, Large Surface Area.

A California King mattress, like the King size bed, has a large surface area with dimensions measuring 72” W X 84” L. Slightly narrower than an Eastern King bed by 4 inches, the California King mattress gains 4” in length, making it a wonderful option for taller sleepers or those of you with pets that like to sleep at the base of the bed. Sheets for a California King mattress can be more difficult to find and often more expensive than standard King size sheets so keep this in mind before deciding.

The slightly longer dimensions of the California King size bed are best suited to a minimum room size of 12 feet by 12 feet.

California King Size Bed Dimensions and Mattress Sizing Chart

Which mattress is right for me?

As you can see there are many deciding factors when choosing a mattress size for your space. Once you have an understanding of the space required and how much space the mattress will take up, those looking for a mattress for children or young adults may want to look towards a Twin, Twin XL, or even a Full size mattress.

While single adults may be most comfortable with a Twin XL, Full, Queen, or even a King size mattress for the most amount of surface space. Couples will find Queen, King or California King size beds are most comfortable, but if budget and space are a factor you could opt for a Full size bed. Just make sure you enjoy cuddling with your partner as it will be a tight fit for some taller or larger couples. After all, Full size mattresses were the norm for couples once upon a time.

Mattress Sizing Chart and Infograph

Choosing a King, California King or Split King Size Mattress

If budget and space are not a deciding factor, both the King and California King size mattresses provide plenty of space and luxury. While both these styles are great if you share your bed with children and/or pets, the California King size bed is the clear winner for taller individuals. For those under 6 feet tall, you may prefer the additional 4” in width that the standard King size mattress provides.

Lastly, for couples who have very different sleep preferences, we recommend purchasing two Twin XL size mattresses. Together, these beds can be placed on a frame or adjustable base to create the same surface dimensions of an Eastern King size bed. Like the Split King option, 2 Twin XL size beds can be used with an adjustable base allowing each sleeper to independently adjust their side of the bed. This is truly the best option for couples who like a lot of customization.


There is no real right or wrong answer when it comes to choosing a mattress size. Room-scale, body type, and preference are just a few of the deciding factors in choosing what best suits you and your family. Once you understand the pros and cons of each choice given to you, you can be confident in making a decision on your next mattress purchase without the worry of whether it will fit into your bedroom.

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