The largest size mattress you can buy is an Alaskan king, which measures 108 inches wide and 108 inches long, or 9 feet by 9 feet. The aptly named mattress (Alaska is the largest state in the U.S.), is massive compared to more standard sizes like a king or even California king. For comparison, the standard king mattress measures 76 inches wide and 80 inches long.
You’ve heard of a California king or even a Split king mattress. If you’re looking for an even bigger mattress and a unique sleep experience, try one of the lesser-known gigantic mattresses: Wyoming, Texas, or Alaskan king.
Not sure why you’d need or want a massive mattress? This guide compares each size, lists some pros and cons, and explains situations where you might want a 9 foot mattress!
The table below outlines the dimensions of oversized mattresses and lays out the recommended room size for each. Want to learn more? Keep reading for more info.
Like its state namesake, the Texas King is the second largest oversized mattress. Measuring 80 inches by 98 inches, or 6.6 feet by 8.1 feet, the Texas king has four inches of width on the standard king. This size is an impressive 8 inches wider than the California king, so it would be ideal for a couple who wants extra room or for a family who wants to co-sleep with children or pets.
The main draw of the Texas king mattress is the long length — 18 inches longer than a standard king.
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Average cost: $2000 – $3500
The largest oversized mattress you can buy, the Alaskan king, is a mattress worthy of a king at 108 inches by 108 inches. With a mattress this large, there will be no more arguing about your partner being a bed hog. The Alaskan king mattress is two feet longer than a California king. This extra length is ideal for tall individuals and anyone with the room for a nine-foot mattress in their home.
Alaskan king mattresses are ideal for families with more than two children who share a bed, since they are so spacious. Mattresses this large are perfect for couples who want to share a bed and have different sleep schedules as the large surface area limits motion transfer.
A bed this large must be supported by a three-piece box spring. When purchasing an Alaskan king, make sure to purchase an adequate three-piece box spring and frame.
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Average cost: $2500-$5000
A Wyoming king bed measures 84 inches wide by 84 inches long, or 7 feet x 7 feet. While not as large as an Alaskan king, this massive mattress is still 4 inches larger per side than a standard king size mattress. A Wyoming king is the same length as a California king—the largest size available at a standard mattress store.
Even though the California king is a large bed compared to regular king size beds, it still might be too narrow for some couples, especially if they ten to sleep with their children or pets. A Wyoming king is 12 inches wider than a Cal king, so each sleeper has plenty of space to stretch out. If you’re considering a Wyoming king bed, make sure your bedroom measures at least 14 by 16-feet for the best fit.
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Average cost: $1500- $3000
An oversized mattress is a luxury for most. For single adults, couples, and your average sized person, an oversized mattress is not necessary. If you want to make the investment and have the space, an oversized mattress can take your sleep to the next level. Mattresses this large aren't worth it for many consumers because they're pricey, difficult to find, and difficult to carry.
In some situations, oversized mattresses are ideal. Not sure if you need one? Read on to find out!
If you co-sleep with your baby, spouse, and pets, an oversized mattress is a great way for the whole family to co-sleep with plenty of space. While oversized mattresses are costly and can be hard to find, if you plan on, or are co-sleeping, buying one large bed might be cheaper than buying individual beds for each family member. If this is the case, co-sleeping with your baby is proven to have many benefits.
If you’re taller or plus-sized, you’re going to take up more room than someone smaller. If you’re over six feet tall, any of these oversized mattresses would be long enough for you to sleep comfortably without your feet hanging over the edge.
For single sleepers, a king or California king mattress might be sufficient, but a mattress that size would be too small for couples. Purchasing an oversized mattress is a good idea if you and/or your partner are taller or plus-sized. A larger mattress will let you both be comfortable with plenty of room.
Do you and your partner have different sleep schedules due to work, school, etc., and often disturb each other when waking up or going to bed? An oversized mattress might be the best solution. A mattress as large as the ones on this list will prevent motion transfer when getting into or out of bed, preventing you from disturbing your partner (especially if they are a light sleeper).
An oversized mattress can be difficult to find—you’re not most likely not going to be able to visit your local mattress store and purchase an Alaskan king mattress. To purchase an oversized mattress, you’ll have to go to a specialty store or boutique retailer. Companies that make these mattresses often make them to order, so you’ll have to put in a special request. These companies also keep sheets, bed frames, foundations, and comforters in stock to fit whichever mattress size you choose.
Depending on where you special order these mattresses, you might be able to decide what type of mattress you want, like hybrid, innerspring, or memory foam. Before purchasing an oversized mattress, make sure it will fit in your bedroom. Walking space and other furniture should be taken into consideration.
Besides your standard and oversized mattresses, there are a few other sizes you might come across. Here’s a rundown of some more uncommon mattress sizes.
An Olympic queen mattress measures 66 inches by 80-inch, making it 6 inches wider than a standard queen mattress. This size mattress is ideal for couples who don’t want a bed that is too large but want some extra space. A mattress this size is recommended for those who have smaller rooms and still want a larger size mattress than the standard sizes available at most mattress stores.
A split California king mattress is built with two sides that are adjustable. Split mattresses, usually available in king size, are recommended for couples who have different firmness preferences. The split design helps establish a boundary between sides of the bed—no more fighting over one partner being a bed hog or stealing the covers from your side of the bed! This size mattress is 72 inches by 80 inches. It's 4 inches narrower than a standard king mattress, yet 5 inches longer to accommodate those over 6 feet tall.
The Emperor mattress is another name for the Wyoming king mattress. This mattress measures 84 inches by 84 inches. Sometimes, Emperor king mattresses will measure 78 inches by 78 inches, depending on the manufacturer and where you purchase them, beds this size are often referred to as mini emperor mattresses.
There is no right or wrong way to choose your right mattress size. Whatever you decide on is ultimately up to you and what you want. However, there are some things to consider when selecting a mattress size.
Still have more questions about oversized mattresses? Here are some FAQs that will help you decide if an oversized mattress is right for you.
The Alaskan king mattress is the largest mattress available. It measures 108 inches by 108 inches (9 feet by 9 feet).
Twin, twin XL, full, queen, king, and California king are the standard mattress sizes available at both online and brick and mortar mattress stores. Queen size mattresses are the most popular, as they are large enough for couples and for single sleepers to have plenty of space.
If you want to purchase a Texas, Wyoming, or Alaskan king mattress, you won’t be able to find them at traditional mattress stores. To purchase an oversized mattress, you’ll need to contact a specialty retailer and have one made to order.
If you're taller, shopping for a mattress can be a challenge. Whatever mattress you purchase should be long enough to stretch your legs out without them hanging over the bed and provide plenty of headroom.
This table breaks down mattress size based on height.
Oversized mattresses aren’t for everyone due to budgetary constraints, lack of space, or simply not wanting a massive mattress. For some, an oversized mattress makes sense depending on your living situation and budget. Sometimes, standard-size mattresses just won’t work. If you do decide to buy an oversized mattress, make sure you do your research, measure your room, and have the budget for it.
While you won’t find an oversized mattress at SleePare, you will find the best mattresses usually available online only in our showrooms, a mattress comparison tool on our website, and our helpful sleep blog!
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Meet The Author:
Shanir Kol
Shanir Kol, founder and CEO of SleePare, pioneered the “Try and Buy” model in eCommerce, enhancing mattress shopping by combining in-store trials with online purchases. Launching in 1999, his company focuses on customer satisfaction and eco-friendly practices, aiming to minimize mattress waste and expand sustainably.