What Is The Biggest Bed Size?

Written by
Purple Staff
Last Updated
February 2, 2023
min read

The biggest bed size in width is the family bed at 144 inches wide and 80 inches long. Wider than it is long. The biggest bed size in length is the Alaskan king at 108 inches wide by 108 inches long. 

The most common size of mattress in America is the queen-size mattress (60 inches wide by 80 inches long), and the second most popular is king-size mattresses (76 inches wide by 80 inches long). 

Oversized beds may seem unnecessary. But there are benefits you should know about. Some outliers prefer to have more bed space than standard sizes – in these cases, upgrading to an oversized bed just might be the answer. 

Keep reading to learn key things you should know about the largest bed sizes on the market.

What Is The Biggest Bed Size?

The biggest bed size on the market is the XL family bed.  The biggest bed size in length is the Alaskan king bedAlthough the XL family bed has a surface area of 84 square feet. Whereas the Alaskan king has a surface area of 81 square feet.

Family beds come in three sizes, the largest (XL) measuring 144 inches wide by 80 inches long. Meanwhile, the Alaskan king measures 108 inches wide by 108 inches long. 

For comparison, Alaskan king beds are over 30 inches wider and longer than the California king (72 inches wide by 84 inches long), the largest standard mattress size. On the other hand, the XL family bed is four inches shorter than a California king but twice as wide. 

The family bed, the Alaskan king, and other extra large mattresses like it are called oversized mattresses. The following are also classified as oversized mattresses:

  • Alberta king: 96 inches wide by 96 inches long
  • Texas king: 80 inches wide by 98 inches long
  • Wyoming king: 84 inches wide by 84 inches long

Oversized Mattress Sizes Explained

An oversized mattress is any that’s larger than a California king mattress. Because of how giant they are, oversized mattresses are typically made-to-order and aren’t stocked in your average mattress store. They require extra space in the bedroom as well, so you’ll want to have a large master bedroom (and a larger bed frame) to fit these giant beds.

Let’s take a look at the different oversized mattress types, their dimensions, and the minimum recommended room sizes for each. 


Measurements (Inches)

Minimum recommended room size (Inches)

Family bed (XL)

144” x 84”

17’ x 12’

Family bed (large)

120” x 80”

17’ x 12’

Family bed (medium)

108” x 80”

14’ x 12’

Alaskan king

108” x 108”

14’ x 14’

Alberta king

96” x 96”

13’ x 13’

Texas king

80” x 98”

12 x 14 

Wyoming king

84” x 84”

12’ x 12’


The Biggest Mattress Sizes Ranked

Big bed sizes are excellent for couples with different sleep schedules or preferences, families, and even single adults on the taller side. Let’s look at the biggest mattress sizes ranked from the largest to the smallest.

Family Beds

Family mattresses are the largest mattress size you can find on the market. They’re not quite as long as the Alaskan king, but they’re much wider – the width of a family bed is the same as two California kings together. 

As their name suggests, family beds are wide enough to fit at least a family of four (and even the family dog) quite comfortably. While these beds might not be long enough for taller people, they’re well suited to co-sleeping families or those who want the (many) extra feet of space.

As these mattresses are so large, some online mattress brands ship these beds in a box. They also require a custom bed frame and special bedding. 

How Big Is A Family Bed?

Family beds come in three sizes:

  • XL family bed: 144” x 80”
  • Large family bed: 120” x 80”
  • Medium family bed: 108” x 80”

Alaskan King

The Alaskan king-size mattress was aptly named after the largest state in America. An Alaskan king is the largest square mattress, making it well-suited to tall sleepers who enjoy having the additional legroom.

An Alaskan king-size mattress has the same width as medium family beds, so it offers plenty of space for smaller families that prefer to co-sleep.

How Big Is An Alaskan King?

Alaskan king mattresses measure 108” x 108”.

Alberta King

Another giant mattress that will give tall individuals a lot of wiggle room and ample sleeping space, the Alberta king is one square foot smaller than the Alaskan king as well as three feet wider and two feet longer than a standard queen-size mattress. 

It could be a good option for couples who move around a lot while sleeping or enjoy the extra legroom. Just make sure you have a larger bedroom (at least 13’ x 13’) to accommodate it. 

How Big Is An Alberta King?

An Alberta king mattress measures 96” x 96”.

Texas King

Named after the second largest state, the Texas king is another excellent option for couples who want a little more personal space or enjoy sleeping with a furry friend. It’s a good fit for average-size bedrooms as it’s not as long as other oversized mattresses.

How Big Is A Texas King?

A Texas king measures 80” x 98”. 

Wyoming King

The Wyoming king is the “smallest” square oversized mattress, but it’s still nearly a foot wider and longer than a standard king-size bed. The Wyoming king will fit comfortably in the average American master bedroom

How Big Is A Wyoming King?

A Wyoming king measures 84” x 84”. 

California King

The California king, though not considered oversized, is the largest standard bed size available on the market. A standard king-size bed is four inches wider than the California king but also four inches shorter. This provides extra length, so it’s a great option for tall sleepers who don’t need as much personal space.

How Big Is A California King?

A California king measures 72” x 84”. 


Learn more about king vs California king mattresses.

How To Choose An Oversized Mattress Size

Deciding which oversized mattress is right for you can be challenging, but there are some things you can consider before choosing one, including: 

  • Room size: You don’t want to buy an oversized bed only for it to not fit in your room! Take Measurements of your bedroom before buying a mattress.
  • Maneuverability: Even if it would theoretically fit, consider how you’ll get the mattress to your bedroom. If the mattress comes in one piece, make sure you’re able to maneuver it through your doors and hallways. 
  • Bed frame: Unless the mattress is designed to lie on the floor, you’ll need a bed frame for it. Because they aren’t typically found in the average bed store, oversized bed frames either need to be custom-made or bought along with the mattress.
  • Bedding: If not bought along with the bed, bed sheets and duvets for these giant mattresses can be difficult to find. One thing to consider when buying a bed is how available bedding is and how easy it will be to make the bed.
  • The number of people: If you’re planning on sharing it with loved ones, family, or pets, an oversized bed might be for you. However, if you’re a single sleeper, a smaller bed size might be just fine. 
  • Height: If you’re a tall individual (or share a bed with one), an oversized bed gives you the room to fully stretch out – with room to spare. 
  • Price: Oversized mattresses cost considerably more than standard sizes. On top of that, shipping, a custom bed frame, and accessories cost extra.

Still not sure what mattress to choose? Read our guide on how to choose a mattress.

Purchasing An Oversized Mattress

When you’ve gone through your options and are certain that an oversized bed is what you want, you’ll need to find a supplier. Oversized mattresses are far larger than standard mattresses, so you won’t find them at your typical mattress supplier. 

Where Can I Buy An Oversized Mattress?

You can buy an oversized mattress online or in a brick-and-mortar store

if you’re lucky enough to have one near you. An easier and more affordable option is to buy standard mattress sizes and combine them into one giant, oversized mattress. 

For example, let’s say you already have a queen mattress but you’d like to upgrade to a bigger bed. Instead of getting rid of your queen bed, you could get a twin XL and combine them to get one giant Texas king (98” x 80”). Or, if you want to go even wider, combine two queen mattresses to make one large family bed (120” x 80”).

Upgrade Your Sleep with Purple

Our patented GelFlex Grid technology provides adaptive support, softness, and comfort that can help you get rejuvenating sleep and start your day refreshed. 


Biggest Bed Size FAQs

Is there a larger bed than a king?

Yes, a California king is larger than a king in length by four inches. Other beds larger than a standard king include: 

  • Wyoming king
  • Texas king
  • Alberta king
  • Alaskan king
  • XL, large, and medium family beds 

What is bigger than a super king?

A standard king is four inches wider and two inches longer than a super king, which measures 72” x 78”.

Read more on super king-size beds.

What size bed is the biggest?

The biggest bed sizes are the XL family bed and the Alaskan king bed. The family bed measures 144” x 80”, while the Alaskan king bed measures 108” x 108”.