At times we are compensated for the links you click at no cost to you. Learn more about why you should trust our reviews and view our disclosure page.
Are you very tall and need more space? Do you need a custom mattress for your antique bed frame? Or maybe you need a custom bed for your RV? Whatever your reason may be, we’re here to provide you with everything you need to know about custom mattress sizes.
Most popular custom mattress sizes
Basically, a custom size mattress is a mattress that’s built to fit a particular space or meet the specific needs of a customer. Nowadays, there are a lot of mattress companies that can manufacture a custom-sized mattress upon your request. Although many non-standard mattress sizes are already available, you can also provide the manufacturer with custom dimensions for your mattress.
Here are some of the most popular custom sizes on the market. These include oversized mattresses and other non-conventional bed sizes (like some custom dorm mattress sizes).
Family Bed
The Family Bed is one of the biggest mattress sizes available today. In fact, it’s the widest mattress in the market. The Family Bed is divided into three variations: Family Bed Medium, Family Bed Large, and Family Bed XL.
The Family Bed XL is the largest version and it measures 144″ x 84″. This mattress size is a whopping 12 feet wide and it can accommodate multiple sleepers. It’s also a great custom mattress option for parents who co-sleep with their children.
Alaskan King
The Alaskan King mattress is the most well-known out of all oversized beds. At 108″ x 108″ or 9 feet by 9 feet, an Alaskan King mattress can accommodate families with two or more children. It’s also the longest mattress around so it’s an excellent choice for very tall people.
Texas King
Unlike the Alaskan King which is a square-shaped mattress, the Texas King is a rectangular mattress that measures 80″ x 98″. It’s slightly wider than a standard King-size mattress but it’s much longer. This bed size is suitable for taller couples who need some extra legroom.
Wyoming King
The Wyoming King is the smallest of the square-shaped oversized mattresses. Nevertheless, at 84″ x 84″, it’s still 8 inches wider than a regular King-size bed. This mattress can accommodate couples that co-sleep with one or two children.
Olympic Queen
At 66″ x 80″, Olympic Queen mattresses are slightly wider than standard Queen-size beds. This custom size mattress is great for couples who want some extra space for themselves at night. One drawback is that it’s pretty hard to find this mattress size as well as the bedding needed for it.
Super Single
A Super Single mattress is both wider and longer than a standard single aka twin-size mattress. It measures 48″ x 84″ and it’s great for single sleepers who are tall and want to be able to spread out on the mattress.
Split mattresses
Split mattresses are split down the middle to form two separate mattresses. The most popular split mattress is the Split king bed (76″ x 80″) which is basically two Twin XL (38″ x 80″) mattresses combined. This custom mattress is best for couples who have different preferences with regards to mattress firmness.
Reasons to get a customized mattress
These are a few situations where a standard-sized mattress might not be able to meet your needs. We recommend getting a custom mattress if:
You need a mattress for your RV
Since standard mattress sizes rarely fit in RVs and campers, you might be looking for mattresses that are made specifically for RVs. Although there are many RV mattresses on the market, there are times when the sizes still won’t fit your RV. This is where a custom mattress comes in handy because you get to choose the specific dimensions of the mattress so it would perfectly fit in your RV.
You need a mattress for your truck
For trucks on the other hand, a custom mattress is almost always going to be your best bet. Fortunately, truck mattresses have been getting more popular and more comfortable as well thanks to reliable mattress manufacturers. It’s very easy to get a custom-made mattress for your truck as long as you provide the correct dimensions for it.
You need a mattress for your boat
Depending on its size, some boats do allow for a standard-sized mattress. But, many smaller models will require custom-sized boat mattresses to get a perfect fit. Before purchasing a custom mattress for your boat, make sure to examine the sleeping area for awkward angles or other complications.
You have a large family
If you have a large family with several kids, your best option is going to be an oversized mattress. You can get standardized sizes like Alaskan king or Texas king, or you can also have a mattress custom-made for your bedroom space.
You have an odd-shaped bedroom
Getting a customized mattress is a good option if you want to sleep comfortably in an unconventional bedroom. Measure your sleeping space precisely and take note of curves and angles in your bedroom. Then, order your custom mattress from a reliable mattress company such as Custom Mattress Makers or Mattress Insider.
Do I need custom-size bedding?
In most cases, you will be needing custom bedding for your custom-size mattress. Remember to confirm the dimensions of your custom-sized mattress from the manufacturer before ordering custom sheets and duvets.
Another option is to use bedding that’s made for standard or oversized mattresses. Although your bed won’t look as sleek and polished as it would be with perfectly tailored bedding. You would also need to look into getting custom made bed frames.
FAQs
While it is possible to customize the size of a mattress yourself, we do not recommend it as it can damage the integrity of the mattress and void your warranty.
Yes, a foam mattress can be resized. However, doing this in your home can void your warranty leaving you with no way of replacing your mattress in the case of manufacturing defects.
Custom mattresses are more expensive than standard models because it’s a bit more labor-intensive. But custom foam mattresses will still be cheaper than those made with gel memory foam or natural latex.
Conclusion
All things considered, we would recommend custom mattresses for individuals and families who need more sleeping space. Custom size mattresses are also great for those who have RVs, trucks, boats, and odd-shaped bedrooms. We hope this article helped you learn more about the different custom mattress sizes and their features.
Next step: If you want to try out a custom-sized mattress that we didn’t mention in this article, we recommend looking at the Full XL size. It’s right in-between Full and Queen, making it the perfect fit for small bedrooms. Read our review of the best Full XL mattresses and find out which is best for you.
Sleepline is the #1 mattress review and sleep information resource on the web.
We personally test every product we review to make sure it meets our strict performance criteria. If we don't like it, we don't recommend it.
- Why is it illegal to remove a mattress tag? (what the penalty is) - July 7, 2025
- Best mattresses for kids (top 5 picks) - January 14, 2025
- Best 12-inch mattress – data-backed performance tests on 11+ brands - January 24, 2024
Psst… the sleep review industry is full of liars, sharks, and thieves. It’s a modern-day version of getting ripped off at your local mattress store. So, why should you trust us?