Updated 9/25/2025
A twin mattress measures 38" wide by 75" long, while a twin XL mattress is the same width (38") but 5 inches longer at 80".
Picking the perfect mattress for your room can be a challenge. In your search for the perfect mattress, you might be considering twin vs. twin XL mattresses—especially if you’re looking to use a small space efficiently.
What’s the difference between a twin XL vs twin? The main difference between these two mattresses is their length—a twin XL is 5 inches longer than a twin.
But mattress shoppers should consider more than just size in their search for the perfect night’s sleep. This guide to the twin vs twin XL mattress debate will also break down mattress cost, potential good candidates for each mattress size, frequently asked questions about twin XL mattresses, and a comparison between these two popular sizes and other common mattress dimensions.
Twin vs Twin XL Key Differences
Twin vs twin XL dimensions are one of the only discrepancies between these two mattress types:1
- AThe standard size of twin mattress measures 38 inches wide by 75 inches long—or 3 feet 2 inches by 6 feet 3 inches.
- A twin XL mattress is slightly longer but the same width: 38 inches wide by 80 inches long—or 3 feet 2 inches by 6 feet 8 inches.
While it might not seem like a massive difference in size, that additional five inches in length can make a world of difference, especially if you’re on the taller side. If you’re taller than 6 feet, you might be used to your feet dangling off a twin-size bed, but a twin XL bed could give significant extra room to stretch out.
However, another discrepancy between twin XL vs twin mattresses is cost. Because it’s a slightly larger mattress size, a twin XL will be slightly more expensive than a standard twin mattress. While some shoppers might not see the need to spend more on a mattress that’s only slightly larger, the extra cost may be worth it for some. That additional space can help you get a deeper, more restful sleep if you are a taller person, provide additional comfort if you typically share a bed with your pet, or offer other benefits (which we’ll break down in more detail below).
But that doesn’t mean a twin XL mattress is right for everyone. So who are these different twin beds ideally suited for?
What to Consider When Choosing a Twin XL vs Twin
When deciding between a twin XL vs twin mattress, there are several factors to consider that can help you choose the one that best fits your needs. Here’s a breakdown of key considerations before you buy.
Bedroom Size and Space
Both twin and twin XL mattresses are great for smaller spaces. However, if you have a particularly tight room or a studio apartment, the compact size of a twin mattress may help make the space feel less cramped. On the other hand, if you can afford a bit more room for length without sacrificing too much width, a twin XL could be a better option.
Cost
Typically, twin mattresses are less expensive than their twin XL counterparts, often by a $50 to $150 difference. Additionally, twin XL accessories, including sheets and bed frames, may cost more due to their relatively lower availability. If you're on a budget, a standard twin mattress may be the more affordable choice overall.
Height of the Sleeper
If you're taller than 6 feet, the extra 5 inches of length on a twin XL mattress can make a huge difference. Although a standard twin (75 inches long) may suffice for most, taller individuals may find themselves cramped, especially when using a thick pillow. If you're around or above 6 feet tall, a twin XL will offer the comfort you need.
Growing Children
For children or teenagers, a twin XL might be a smarter investment. Kids often experience growth spurts, and the additional length will help ensure that their mattress doesn’t become too short too soon. This can save money in the long run, as the mattress will last for several more years without outgrowing it quickly.
Sleeping Position and Comfort
Your sleeping position plays a big role in mattress choice. If you tend to sleep with your arms and legs sprawled out, the narrowness of both a twin and twin XL might be uncomfortable. However, if you’re someone who likes to sleep with fewer restrictions on your movements, the extra length of the twin XL could provide more comfort, especially when laying on your back or side.
Availability
While twin mattresses are much more commonly available, twin XL mattresses are still widely used, especially in college dorms. One potential downside is that twin XL bedding can be harder to find at local stores, and you may need to order online. If you’re looking for convenience and fast access to sheets, a twin mattress may be easier to shop for.
Who Should Choose a Twin Mattress?
A standard twin-size mattress is 38 inches wide and 75 inches in length. Twin mattresses are the most commonly used mattress when it comes to bunk bed mattress size—so if you recently bought a bunk bed frame, you’ll likely need two twin mattresses to complete the piece.
But kids and bunk bed sleepers aren’t the only good candidates for a traditional twin mattress. And while parents of young children typically purchase twin beds once their kids graduate from crib-size mattresses, twin beds certainly offer other valuable applications.2 You might also opt for a twin bed if:
- You’re shorter than 6 feet tall and typically sleep by yourself
- You’re trying to furnish a guest room with multiple beds
- You’re trying to make the best use of space in a:Studio apartment
- Small bedroom
- Assisted living or group home bedroom
Plus, it might be significantly easier to find sheets for a standard twin bed at a big box store. Since twin beds are more common than twin XL mattresses, it might be easier to find bedding for the former if you don’t have time to order linens online.
But who should consider steering clear of the standard twin mattress?
Technically, this mattress can fit someone 6 feet 2 inches or shorter. However, most people don’t sleep with their heads right at the top edge of the mattress—they need a little extra room to get comfy.
If you’re around 6’2”, you’ll probably be too big for a twin bed. And, as you might imagine, while you may be able to cuddle in a twin, they’re not the best bed size for couples to share. Although it is possible, it’ll certainly be a snug fit.
Who Should Choose a Twin XL Mattress?
About 80% of the mattresses provided in typical college dorm rooms are twin XLs.3 But twin XL mattresses are useful in a variety of scenarios—in some, they might even be preferable to a standard twin or a larger bed. Let’s explore who might be a good candidate for the twin XL.
A twin XL mattress has the same 38-inch width as a standard twin mattress. However, its extra 5 inches of length extend the bed to 80 inches in total, meaning it can technically accommodate someone significantly taller than six feet.
This extra length could make all the difference in comfort, especially for a taller sleeper. This is why twin XL-size mattresses are often considered the ideal single bed for college students or adults. Other potential candidates for a twin XL mattress might be people:
- Who like to snuggle up with their pets at night – A twin XL might provide the perfect spot for a snoozing cat or a small dog to curl up at the head or foot of the bed. That said, if you have large or even multiple pets, you’ll likely benefit from larger beds like a full or queen.
- Interested in adding footboard storage – Sleepers whose feet threaten to dangle off of a standard twin might want to avoid kicking anything they store at the foot of the bed.
- Looking for additional under-bed storage – Renters, for instance, might not have an opportunity to drill holes for shelving. The space under the bed might be one of the few options for efficient storage.
All of that said, a twin XL might not be ideal for everyone. It takes up slightly more space than a standard twin—shorter sleepers who don’t need the extra length for comfort might not want to waste valuable inches in a room with limited floor space.
A twin XL mattress also may not be suitable for couples to share—remember, a twin XL is only longer than a standard twin, not wider.
And while a twin XL is one of the longer standard mattresses available—it’s the same length as both queen and standard king mattresses—it might still not be long enough for someone much taller than average. Sleepers bordering on seven feet tall might have to invest in a larger bed (like a California king, which is 7 feet long) or sleep diagonally (in which case a wider bed would provide optimal room).
Comparing Twin and Twin XL to Other Mattress Sizes
To put the twin vs twin XL dimensions into perspective, it’s helpful to compare them to other bed sizes. In doing so, you can find the perfect mattress size for your sleep preferences and bedroom.
While there may be some variants, the vast majority of mattresses will come in one of six standard mattress sizes:
- Twin mattress – 38 inches x 75 inches (3 feet 2 inches x 6 feet 3 inches)
- Twin XL mattress – 38 inches x 80 inches (3 feet 2 inches x 6 feet 8 inches)
- Full or double mattress – 53 inches x 75 inches (4 feet 5 inches x 6 feet 3 inches)
- Queen mattress – 60 inches x 80 inches (5 feet x 6 feet 8 inches)
- King mattress – 76 inches x 80 inches (6 feet 4 inches x 6 feet 8 inches)
- California king mattress – 72 inches x 84 inches (6 feet x 7 feet)
If you are a couple or have a pet you like to sleep with, chances are you’ll want to consider a queen or full vs. twin mattress.
What to Look for When Shopping for a Twin or Twin XL
If you’re ready to start mattress shopping, pay close attention to:
- Quality – Well-made mattresses feature resilient springs, premium foams that resist compression, and excellent spinal support. Before committing to a mattress, read up on its materials and construction to make sure it’ll last.
- Price – When it comes to mattresses, you certainly get what you pay for. If you can, we recommend saving up for a mattress that will last instead of purchasing a cheaper product with a shorter lifespan.
- Special sleep needs – Are you a sweaty sleeper? You might need a mattress with cooling features. Highly sensitive to dust mites? Consider a mattress (or a mattress protector) made from hypoallergenic materials. Your specific sleep needs might help you rule out some options.
Frequently Asked Questions About Twin XL Mattresses
If the added height of the twin XL mattress is appealing to you, you might have some questions about committing to a new bed size. Let’s break down a few twin XL FAQs.
Will Regular Twin Sheets Fit a Twin XL?
While some twin flat sheets may fit a twin XL mattress with no noticeable difference, you may need to purchase fitted sheets specifically for a twin XL mattress. In many cases, a regular twin-size sheet is likely to slip off a twin XL bed. Casper’s twin sheets are available in twin and twin XL sizes so you can be sure of the right fit.
Will a Twin XL Mattress Fit in a Regular Twin Bed Frame?
Generally speaking, there are two types of bed frames available on today’s market:
- Stationary bed frames with static dimensions
- Modular or extendable bed frames with a range of available dimensions
The latter are usually rack-style or made with an adjustable metal frame. As long as your modular twin bed frame can extend to the length of a twin XL, it should be able to accommodate one.
If your static twin bed frame can’t be extended, however, you’ll likely have to buy a new one if you choose to size up to a twin XL.
Can Two People Sleep in a Twin XL?
If you and your partner feel too crammed in a standard twin bed, you probably won’t be any more comfortable in a twin XL. As we mentioned above, these two mattresses are the same width.
But if you both like to cuddle and don’t fidget much during sleep, you could make a twin XL work for partner sleeping. Most couples would likely be more comfortable on a full mattress or larger.
Do Two Twins Make a King?
Two standard twin beds do not make a king, but two twin XL mattresses side by side equal the dimensions of a standard king (76" wide x 80" long). Wondering what size bed two twins make? While the final product may not be as long as a king-size bed, it will have the same width.
Casper—For a Twin Mattress Made for You
Typically, twin and twin XL mattresses aren’t built to last. They’re often treated as an in-between bed meant for a child, a teenager, or a college student. Additionally, when it comes to bunk bed mattress size, twin and twin XLs are the most common. As a result, many twins are cheaply made and uncomfortable.
But they don’t have to be.
This is where Casper makes all the difference. Casper twin and twin XLs can deliver unbelievably nourishing sleep. The contouring memory foam gives you the perfect blend of comfort and support, ensuring a deep night’s rest. No matter which of our quality, durable models you choose, Casper twins are perfect for a kid’s room, a daybed, a college dorm room, or a studio.
Want to see for yourself? We offer an unbeatable 100-night free trial. If you don’t love your new twin-size mattress, just let us know within 100 days, and you’ll receive a full refund. We’re that confident you’ll love it.
Sources:
- Sleep Foundation. Twin vs Twin XL. https://www.sleepfoundation.org/mattress-sizes/twin-vs-twin-xl
- Consumer Affairs. Best Mattress for Kids. https://www.consumeraffairs.com/furniture/best-mattress-for-kids.html
- College Supply List. College Dorm Bed Sizing – How Big Should You Expect?. https://collegesupplylist.com/college-dorm-bed-sizing/
