Mattress Size Chart & Dimensions Guide

Deciding to get a new mattress is a big decision. After all, you’ll spend about one-third of your life on it. Ensuring that you get an appropriately sized mattress is just as important as the material it’s made of and how firm you want it to be. The last thing you want is to bring home your new mattress and find that it doesn’t fit in your bedroom.
Unless you’re looking for a custom mattress size, like one to fit a particular space in your home or an RV, bed sizes are standard across the board. In other words, a twin mattress from Macy’s will be the same size as a twin mattress from Tuft & Needle or Casper. That means a bed size chart can help you pick out the right sized mattress no matter where you’re shopping.

mattress size chart guide

Below, we discuss the dimensions of twin, twin XL, full, queen, king, split king, and California king beds. If you do happen to be in the market for a custom size mattress, though, learn how to get your hands on one at the bottom of the page.

Feel free to use the links above to jump to your desired mattress size. We even mention the more obscure mattress sizes, such as the double and three quarters.

Twin Mattress Dimensions: Length & Width

Twin mattresses are best for the average child, starting from the time they outgrow their toddler bed to the time they’re pre-teens or even early teens if they’re short. Standard twin bed dimensions are 38 inches x 75 inches.

Mattress Sizes Twin Twin XL Dimensions Graphic
The difference between a twin mattress and a twin XL

Surface Area

Twin mattresses have a surface area of 2,850 inches. That area is roomy enough for small humans like children but probably too small for your average adult — even if they’re a lone person using the mattress.

Best for

Twin mattresses are best for younger children, pre-teens and kids in their early teen years. The twin mattress is excellent for those who have recently aged out of smaller beds or sharing the bed with their parents and are sleeping independently.


  • Don’t take up too much space, so they are great for a smaller bedroom. 
  • They are a good size for children in their adolescence who don’t need a full-size mattress.


  • Not big enough for most adults
  • Not an ideal solution for adults living in small spaces like an RV or a tiny home

Here’s our list of the best twin mattress options on the market today.

Twin XL Mattress Dimensions

Slightly longer than a twin mattress, a twin XL is made to accommodate taller individuals or single sleeping adults who have a smaller living space, like college students in dorm rooms or bunk beds in vacation homes. A Twin XL mattress is 38 inches x 80 inches.

Surface Area

The Twin XL Mattress has a surface area of 3,040 inches. The additional five inches of length expands the Twin XL surface area significantly, providing extra space for taller people.

Best for

Twin XL mattresses are typically best for kids, teenagers, and single adults. These mattresses fit well in dorm rooms or vacation homes and can also fit some bunk bed frames.


  • Provide additional space for taller people, like teens who have hit a growth spurt or young adults
  • They don’t take up much space, so they are great for small rooms


  • Only suited for people who sleep alone and are in more confined spaces like small houses or dorm rooms 
  • Don’t provide much space for company or people who move around when they sleep

Full Mattress Dimensions

As you can probably guess, a full-size mattress is larger than a twin XL but not yet as big as a queen mattress. It’s a mattress for adults, although it’s the same length as a regular twin mattress. The dimensions of a full mattress are 54 inches x 75 inches.

Mattress Sizes Full Mattress Dimensions Graphic
The dimensions of a full or double bed

Surface Area

The full mattress has a surface area of 4,050 inches. This mattress is considerably larger than either twin or twin XL mattresses because of the additional width, which provides more room. But it’s shorter than the twin XL mattress, which might be inconvenient for taller people.

Best for

Full-size mattresses are best for teenagers, single adults or people who live alone or with a pet or small child. It can work for multi-person households if you like to sleep close to one another and you’re not too tall.


  • Don’t take up too much space while providing ample room for one adult
  • Can accommodate two adults if they don’t mind being cozy
  • Affordable option compared to larger mattresses


  • Not ideal for sharing with multiple people
  • Don’t offer a ton of space if you like to move around in your sleep

Queen Size Mattress Dimensions

The Queen size mattress is the most popular in the United States. Queen size bed dimensions are 60 inches x 80 inches.

Mattress Sizes Queen Dimensions
The queen size mattress is big enough to fit two people

Surface Area

The queen size mattress has a surface area of 4,800 inches. That provides additional space, both in length and in width, that you do not get from a full-size mattress.

Best for

Queen size mattresses are perfect for couples, single adults who like to have some space to sprawl out and single adults who sleep with a pet or child.


  • Ample space for sprawling out or sharing depending on your living situation 
  • Most popular mattress size


  • More expensive than full-size mattresses
  • Take up more space and could make small rooms look cramped

King Mattress Dimensions

Unbeknownst to some folks, king beds are the same length as queen mattresses — they’re just wider. The king bed dimensions are 76 inches x 80 inches.

Mattress Sizes King Split King Dimensions Graphic
Split king mattresses are separated down the middle, and each side works independently from one another

Surface Area

The king-size mattress has a surface area of 6,080 inches. That provides additional space that a queen does not provide, offering considerably more surface area thanks to the wider mattress size.

Best for

King size mattresses are ideal for couples who want to spread out or families who like to share the bed, but it’s also a good option for single adults who like to have even more space to call their own.


  • It provides more width than a queen mattress
  • Great for sharing the bed with a partner, children or pets


  • Only offer additional width; the length is the same as the queen mattress
  • It takes up a lot of space

Split King Mattress Dimensions

Split king mattresses offer flexibility on top of the considerable size by splitting the mattress into two equal sides. Split king beds are typically the size of two twin XL mattresses side by side, 38 inches x 80 inches each, for a total of 76 inches wide.

Surface Area

The split king size mattress has a surface area of 3,040 inches on each side. That’s a combined surface area of 6,080 inches, which is the same as the regular king mattress.

Best for

Split king mattresses are best for people sleeping together who have different preferences about their beds. So one partner might like the feeling of memory foam while the other sleeps hot and would rather have the firmness of an innerspring mattress. The split king works great with adjustable bed frames because each side can have separate settings.


  • Flexibility for each partner to choose the preferred level of mattress firmness and comfort
  •  Same spacious arrangement of a king mattress


  • A large bed may not be suitable for small spaces 
  • Hard to find bedding
  • You can feel the edge of the mattresses in the middle of the bed

California King Dimensions

A California king mattress is a super-sized bed. The exact California king dimensions are 72 inches x 84 inches, which is less space in width than a regular king-size bed, but it is four inches longer.

Mattress Sizes CA King Dimensions Graphic
The California king mattress is one big bed

Surface Area

The California king size mattress has a surface area of 6048 inches. While it’s not a lot more surface area than a standard king mattress, it does offer it differently, adding length while losing a little width.

Best for

The California king mattress is best for couples where one or both partners are taller than average people, couples who share their bed with other family members or pets or people who are very tall and need the extra legroom.


  • Additional length 
  • Enough legroom even for very tall people


  • It takes up a considerable amount of space and will fill up a bedroom quickly 
  • It is more of a specialty or luxury bed, which can be expensive

Other Mattress Sizes

Mattress SizeDimensionsSurface AreaBest ForProsCons
Crib Mattress27.25” x 51”1,389.75 inchesBabiesIdeal size to fit in a cribWon’t fit most adults
Three-Quarters Mattress48” x 74”3,552 inchesTiny homes, RVsGood for small spacesNot as long as a twin bed, hard to find bedding
Split Queen Mattress30” x 80”2,400 inches on each side, 4,800 totalCouplesCan get different mattresses to fit each person’s preferencesHard to find, can be expensive
Grand King Mattress80” x 98”7,840 inchesFamilies, super tall peopleTons of roomTakes up a lot of space
Round MattressVariesVariesA certain aestheticUniqueHard to find, may require custom linens

What Factors To Consider When Choosing Mattress Size

When choosing your mattress size, you’ll want to take into account the size of the room. A smaller room likely cannot fit a queen or king-size mattress unless you are okay with your bed taking up most of the space. 

You will also want to consider the size of your bed frame. If you aren’t purchasing a new bed frame, you will want to find a mattress size that fits your existing frame.

Take into account who will be using the mattress, as well. If you’re sharing it with a partner or have a family arrangement, you will likely want a larger mattress. If you are living alone, you may be fine with a smaller mattress. Sometimes, arrangements like a split king or queen beds are good options for people who sleep together but want a different mattress firmness.

You should also consider your price range. You can get cheaper or more expensive mattresses in any size, but generally, the larger the mattress, the more you’ll pay. Take your budget into consideration when picking a mattress size.

Some people may need to custom order a mattress to fit their particular space or needs. If you have an antique bed frame, you may have to custom order a mattress since beds before the 20th century didn’t come in standard sizes. So if you have an antique treasure on your hands or want a unique mattress, you’ll have to place a custom order. Just know that most brand names like TempurPedic and Casper don’t make custom beds, so you’ll have to try a specialty company. 

Overview Of Suitable Bed Sizes

Still trying to figure out which size mattress you’ll need? We’ll make it easy for you. Below, we map out the best mattress size options for everyday situations.

If you’re searching for a mattress for a child’s bed

  • Twin
  • Twin XL

If you’re searching for a mattress for a teen’s bed

  • Twin XL
  • Full
  • Queen

If you’re searching for a mattress for couples

  • Queen
  • King
  • California king
  • Split king

If you’re searching for a mattress sizeable for adults and pets/children

  • Queen
  • King
  • California king

If you’re looking for a mattress comfy enough for someone over 6’10”

  • California king
What is an Olympic queen mattress?

An Olympic queen mattress is 6” wider than a standard queen size mattress. It’s ideal for people who want more space but don’t want as much width as you get from a king size.

What is an Eastern king mattress?

An Eastern king mattress is just another name for a traditional king mattress.

What is the most popular bed size?

The most popular mattress size in the United States is a queen size mattress. It is an accommodating mattress because it’s suitable for couples and single sleepers who want a bit more space.