What Is The Difference Between A Twin And Twin XL Mattress?

February 18, 2021 | Casper Editorial Team

Picking the perfect mattress for your room can be a challenge. If you’re looking to economize on space, you might be looking at a twin or twin XL.

But what’s the difference between a twin and twin XL? The main difference between a twin and twin XL is the length – a twin XL is 5 inches longer.

Read on as we compare these two mattress sizes more in depth below.

Twin vs Twin XL 

There’s very little that separates these two types of twin beds. In fact, it boils down to two important factors1

  • Length – The major difference between a twin and twin XL is the length. At 80 inches in length, a twin XL is five inches longer than the standard 75 inches of a twin. That additional five inches in length can make a world of difference, especially if you’re on the taller side and used to your feet dangling off a twin size bed. 
  • Cost – Because it’s a slightly larger mattress size, a twin XL will be slightly more expensive than a standard twin mattress. For some, the extra cost may be worth it. That additional space can help you get a deeper, more restful sleep if you are on the taller side. 

As the name suggests, a twin XL mattress brings a bit more size and cost to the mattress conversation. But that doesn’t mean a twin XL is right for everyone.

So who are these different twin beds ideally suited for?


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. Technically, this mattress can fit someone 6’2 or shorter, seeing as 75 inches is equivalent to 6’3. However, most people don’t sleep with their head 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. Realistically, a twin is better suited for:

  • An adult who is 6’ tall or less
  • Children and teenagers

As you might imagine, while you may be able to cuddle in a twin, they’re not ideal for couples to share for sleeping. Although it is possible, it’ll certainly be a snug fit. 

Twin XL  

A twin XL mattress has the same 38 inch-wide dimensions as a standard twin mattress. However, its extra 5 inches of length extends the bed to 80 inches in total, meaning it can technically fit someone who is 6’7. 

This extra length can make all the difference in comfort, especially for a taller sleeper who is around 6’ tall. This is why twin XL size mattresses are considered the ideal single bed for a college student or adult. 

Again, it may not be suitable for couples to share — remember, we’re talking length, not width — but it would still be roomier than a twin. 

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.

Comparing Twin and Twin XL to All Mattress Sizes

To put the twin vs twin XL size difference into perspective, it’s helpful to compare their mattress dimensions to other beds’ sizes. In doing so, you can find the perfect bed 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
  • Twin XL mattress – 38 inches x 80 inches
  • Full or double mattress – 53 inches x 75 inches
  • Queen mattress – 60 inches x 80 inches
  • King mattress – 76 inches x 80 inches
  • California king mattress – 72 inches x 84 inches

If you are a couple or have a pet you like to sleep with, chances you’ll want to consider a full vs. twin mattress. But what if there was a way to upgrade your sleeping situation with just two twins?

Two Twins Make a King 

Do you and your partner have different preferences for the type of mattress you enjoy? 

If one person likes a stiff mattress and the other prefers a soft one, you may feel like you have to compromise on a middle ground solution, or just go with either the firm or the soft. But there’s a better way to make both parties happy — one that doesn’t involve an uncomfortable compromise for both of you. 

So, what’s the solution? 

Instead of buying a king bed, you buy two twin XLs — each with the individual’s preferred mattress type. Then, you just push them together to accommodate both parties. As one, the dimensions of two twin XLs are 76 inches by 80 inches, which makes your ultra bed the same length as a standard king size.   

Or, if both partners are under 6’ (and you’re looking to save a little money or space), you could also just push two standard twins together to make a large bed. Wondering what two twin beds make when pushed together? 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. Whether you want the Wave Hybrid or the Original Hybrid twin, Casper twins are perfect for a kid’s room, a daybed, a college dorm, 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.


  1. Sleep Foundation. Twin vs Twin XL. https://www.sleepfoundation.org/mattress-sizes/twin-vs-twin-xl