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Bedroom Design

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

    Last Updated
    February 1, 2024
    min read

    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.

    Purple Mattresses

    Purple has the bed for you. Our exclusive GelFlex® Grid dissipates heat and cradles your body exactly where you need it.

    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. 

    graphic comparing the dimensions of the five biggest bed sizes.

    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 (XL)

    Family bed (large)

    Family bed (medium)

    Alaskan king

    Alberta king

    Texas king

    Wyoming king

    California king

    Dimensions (in)

    144 x 84

    120 x 80

    108 x 80

    108 x 108

    96 x 96

    80 x 98

    84 x 84

    72 x 84

    Dimensions (cm)

    365.76 x 213.36

    203.2 x 203.2

    274.32 x 203.2

    274.32 x 274.32

    243.84 x 243.84

    203.2 x 248.92

    213.36 x 213.36

    182.88 x 213.36

    Surface Area

    12,096 sq in

    9,600 sq in

    8,640 sq in

    11,664 sq in

    9,216 sq in

    7,840 sq in

    7,056 sq in

    6,048 sq in

    Minimum Room Size (ft)

    17 x 12

    15 x 12

    14 x 12

    14 x 14

    13 x 13

    12 x 14

    12 x 12

    12 x 14










    Family Bed


    • 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. 



    Comfortably fits co-sleeping families with several children and pets

    Doesn’t fit in an average-size bedroom

    Comfortably fits adults with larger body types

    Difficult to find mattresses and accessories of this size

    Fills oversized bedrooms

    Hard to transport

    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.



    Great for tall sleepers and adults with larger body types

    Requires an oversized bedroom

    Allows small co-sleeping families room to move without disrupting each other

    Hard to find 

    Luxurious look

    Often requires custom-made accessories 

    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.



    Perfect for tall individuals and adults with larger body types

    Least common oversized bed, making it difficult to find

    Comfortably fits co-sleeping families with one or two children

    Requires made-to-order bedding accessories

    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.



    Suitable for very tall sleepers (6.5 to 7 feet tall) with room at the foot of the bed for pets

    Narrowest oversized mattress

    May fit into average-size or rectangular bedrooms

    Better for sleeping with pets than co-sleeping with more than one child

    A big bed in a room with neutral accents, including a velvet headboard, knit throw blanket, and a wood and cane nightstand.

    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.



    Great for tall sleepers and couples looking for extra space 

    Co-sleeping with more than one child or an older child may feel cramped

    Fits into average-size primary bedrooms

    Doesn’t work for guest rooms or small bedrooms

    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.



    Room for two adults and one small child

    Co-sleeping with more than one child or an older child may feel cramped

    Commonly sold and readily available

    Commonly considered bigger than a king but actually offers a smaller surface area

    Fits into average-size primary bedrooms


    Sleep Like Royalty with Purple

    Purple offers mattresses fit for a queen or king. Try our GelFlex® Grid for unmatched cooling and pressure relief.

    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.
    10 considerations for buying an oversized mattress paired with a photo of a white family of four sitting on a bed smiling.

    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 mattresses 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.


    Biggest Bed Size FAQ

    The family bed XL is the widest mattress at 144 inches. This specialty size requires custom manufacturing. The widest mattress sold by most mattress retailers is the king mattress at 76 inches wide.

    The longest mattress is the oversized Alaskan king at 108 inches. The California king is the longest mattress commonly available to consumers at 84 inches.

    King beds are not the biggest bed size. A California king is bigger than a king in length by 4 inches. Other beds larger than a standard king include:

    • Wyoming king
    • Texas king
    • Alaskan king
    • Alberta king
    • Family bed (XL, large, and medium)

    No, queen mattress and bed frame dimensions are not the largest available. There are nine mattress sizes larger than a queen, including:

    • King
    • California king
    • Wyoming king
    • Texas king
    • Alaskan king
    • Alberta king
    • Family bed (XL, large, and medium)

    The biggest bed size is the family bed XL. The family bed XL measures 144 by 84 inches and is bigger than an Alaskan king.

    About the authors

    April Seifert

    April has nearly a decade of writing experience, with 3+ years specializing in sleep content. Her work has been covered by sites like BuzzFeed, Entrepreneur, and Money Under 30. She has an M.A. in Magazine, Newspaper, and Online Journalism from Syracuse University and a B.A. in Communication Studies. As a self-proclaimed expert in all things cozy, she sleeps better at night, knowing her writing helps others sleep in comfort, too.

    Kristen Olson-Turner
    Senior Director of Merchandising, Mattress and Bases

    Kristen Olson-Turner is the Senior Director of mattresses, where she has spent 10+ years understanding customer needs and integrating solutions into Purple products for better sleep and comfort.