Biggest Bed Size: Family, Alberta, Wyoming, Texas, & More

The biggest bed size available is the family bed XL measuring 144 inches wide and 84 inches long. Other oversized mattresses include the Alaskan king, Alberta king, Texas king, Wyoming king, and California king.

While most assume the California king bed earns the title of biggest bed size, some manufacturers have developed even larger sizes to accommodate different sleepers’ needs.  

The biggest bed size available is the oversized family bed XL at 144 inches wide and 84 inches long. The most common mattress size in America is the queen-size mattress (60 inches wide by 80 inches long), and the second most popular is the king-size mattress (76 inches wide by 80 inches long). At Purple, the largest bed sizes we offer are the king and California king.

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If you’re a co-sleeping family with multiple children and pets, an oversized mattress may best match your needs. With seven sizes to choose from, you can find the size that best matches your sleep situation. Follow along as we highlight the biggest bed sizes available, how to choose the right one for you, and where to buy an oversized mattress.

What Is the Biggest Bed Size?

The biggest bed size on the market is the family bed XL amounting to 84 square feet in surface area. Family beds come in three sizes, with the largest (XL) measuring 144 inches wide by 84 inches long. 

The second largest is the Alaskan king bed, which is the longest bed available. It measures 108 inches wide by 108 inches long. 

For comparison, the family bed XL is the same length as a California king (72 inches wide by 84 inches long) but is twice as wide. The Alaskan king is over 30 inches wider and longer than the California king.

The family bed and other similar extra large mattresses are called oversized mattresses. An oversized mattress is any size that’s larger than a California king mattress. 

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

Because of their size, oversized mattresses are typically made to order and are not stocked in your average mattress store. Oversized beds require extra large bedrooms and often custom-made bed frames and bedding. All of these factors also increase the price of these custom beds.

Let’s take a look at the different oversized mattress types, their dimensions, and the minimum recommended room sizes for each in the biggest bed size chart below.

Family Bed

Dimensions: 

• XL family bed: 144 inches wide by 84 inches long
• Large family bed: 120 inches wide by 80 inches long
• Medium family bed: 108 inches wide by 80 inches long 

Family beds are some of the largest mattresses available, with the XL family bed taking the number one spot as the biggest bed size. While not the longest mattress available, the XL family bed is the widest mattress size. It is the same width as two California kings together — an impressive 12 feet wide. Its length matches a single California king bed — 7 feet long. 

The large and medium family beds also vary in width (120 and 108 inches, respectively), but both measure 80 inches long — the same length as a queen mattress. 

As the name suggests, family beds are wide enough to comfortably fit at least a family of four (and even the family dogs). They’re well suited to co-sleeping families or those who want the (many) extra feet of space. 

Such an oversized bed requires an oversized bedroom to accommodate it. The average U.S. bedroom is 132 square feet, but family beds need between 168 to 204 square feet of space. 

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

Alaskan King Mattress

Dimensions: 108 inches wide by 108 inches long

The Alaskan king bed was aptly named after the largest state in America. At 9 feet by 9 feet, it is the most well-known oversized mattress. As the longest bed size, it offers additional legroom, making it well suited for tall sleepers. This size mattress has the same width as the medium family bed, which is equivalent to two full-size beds. The extra width offers plenty of space for smaller families that prefer to co-sleep but also like their space.

Alberta King

Dimensions: 96 inches wide by 96 inches long

Another oversized mattress, the Alberta king measures 8 feet wide by 8 feet long, offering 64 square feet of room to sleep. It is 3 feet wider and 2 feet longer than a standard queen-size mattress.

This is a great option for couples and co-sleeping families who move around a lot while sleeping or for tall individuals to enjoy the extra legroom. Just make sure you have a larger bedroom (at least 13 feet by 13 feet) to accommodate it.

Texas King

Dimensions: 80 inches wide by 98 inches long

Named after the second-largest state, the Texas king bed offers nearly 55 square feet of sleeping space. Compared to the California king, Texas king beds are 14 inches longer and 8 inches wider. In relation to the standard king, Texas kings are only 4 inches wider but a foot and a half longer. The extra legroom makes it a suitable choice for tall couples who like their personal space or enjoy sleeping with a furry friend.

Texas beds make a good fit for average-size primary bedrooms as their rectangular shape isn’t as wide as other oversized mattresses.

Wyoming King

Dimensions: 84 inches wide by 84 inches long

The Wyoming king is the “smallest” within the oversized mattress category, but it’s still a foot wider than a California king bed and the same length. It’s also 4 inches wider than a Texas king, but offers less surface area at 49 square feet. At 84 inches long, tall sleepers can sleep peacefully in a Wyoming king bed.

Its square shape fits comfortably in the average American primary bedroom.

California King

Dimensions: 72 inches wide by 84 inches long

The California king, though not considered oversized, is the longest standard bed size available on the market. In comparing king vs. California king mattresses, a California king is 4 inches longer than the standard king but also 4 inches narrower. This extra length makes it a great option for tall sleepers who don’t need as much personal space.

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How To Choose an Oversized Bed

Deciding which size bed is right for you can be challenging, especially when considering the biggest bed sizes. Here are some things to factor into your purchase, including:

• Occupancy: If you’re planning on sharing with loved ones, family, or pets, an oversized bed might be for you. A couple with one small child could opt for a California king bed, whereas a couple with multiple co-sleeping children and pets might consider a family bed. 
• 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. Any oversized mattress will likely work unless you’re over 6 and a half feet tall or share the bed with pets or kids. If so, consider an Alberta king mattress or larger.
• Room size: You don’t want to buy an oversized bed only to realize it won’t fit in your room after delivery. Measure your bedroom before buying a mattress to ensure you can arrange your bedroom furniture in a way that allows room to walk around.
• Transportation: 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. Keep in mind that a bigger bed means the mattress weighs more, too. 
• Availability: Most oversized mattresses are not readily available at standard mattress stores. They are sold online from specialty manufacturers and may even be made to order. 
• Bed frame: Unless the mattress is designed to lie on the floor, you’ll need a bed frame. Because they aren’t typically found in the average bed store, bed frame sizes this large either need to be custom-made or bought along with the mattress.
• Bedding: If not purchased bundled with the bed, bed sheets and duvets for oversized mattresses can be difficult to find. One thing to consider when buying a bed is bedding availability and how easy it will be to make the bed.
• Price: Oversized mattresses cost considerably more than standard sizes. On top of that, shipping, a custom bed frame, and accessories cost extra. Plan to spend at least a few thousand dollars on a bed of this size.

Where To Buy 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.

Start your hunt by browsing online for a manufacturer specializing in oversized or custom-sized mattresses. Be sure to read through reviews and frequently asked questions to understand the company’s:

• Quality standards
• Materials
• Benefits
• Ordering and shipping processes 
• Warranty and refund policies

An easier and potentially more affordable solution is to buy mattresses in standard sizes and combine them into the size of an oversized bed.

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 inches by 80 inches). Similarly, you could purchase a second queen mattress to add to your existing queen to make one large family bed (120 inches by 80 inches).

Or, if you already have a California king and you want to go even wider, you can make the biggest bed size by purchasing a second California king mattress. Two California king mattresses combined create an XL family bed (144 inches by 84 inches).

These hacks may make it easier to build an oversized mattress and find bedding, but you’ll still need the proper bed frame — likely custom-made.

Upgrade Your Sleep With Purple

If your bedroom won’t fit an oversized mattress but you want to upgrade to a bigger bed size, choose a mattress from Purple in a king or California king size. Our patented GelFlex® Grid technology provides adaptive support, softness, and comfort that can help you get rejuvenating sleep and start your day refreshed.