Twin XL vs. Full: Which Should You Choose?

October 7, 2021 | Casper Editorial Team

Once you’ve decided it’s time for a new mattress, the first step is to figure out what mattress size is right for you. Those who have large spaces and want room to sprawl may prefer a queen or California king. Meanwhile, sleepers with smaller bedrooms or tighter budgets may prefer the cozy price of a twin or full. When looking into smaller options, you may wonder what the difference is between twin XL vs. full beds.

From your price point to your height, there are a variety of factors that set the bed sizes apart. Keep reading for an in-depth comparison of the twin XL vs. full size.

Our innovative full size mattresses are made from multiple layers of cooling foam. They’re squeezed down into a tiny box, which magically appears on your doorstep within a few days.

Twin XL vs. Full Dimensions

  Twin XL Full
Dimensions 38” x 80” 53” x 75”
Surface Area 3,040 square inches 3,975 square inches
Best For
  • Tall sleepers
  • Tight budgets
  • Narrow rooms
  • Shared beds
  • Space to sprawl
  • Larger rooms
  • More leg room
  • Less pricey
  • Larger surface area
  • Easier to find accessories
  • Harder to find accessories
  • Less room to share the bed
  • More expensive
  • Less leg room

A twin XL mattress is 38 inches wide and 80 inches long with a surface area of 3,040 square inches (21.1 square feet). This size is best for tall sleepers, those with narrow bedrooms, or people on tighter budgets. 

Meanwhile, a full mattress is 53 inches wide and 75 inches long with a surface area of 3,975 square inches (27.6 square feet). The full is best for shorter sleepers with square-shaped bedrooms and shared sleeping arrangements.

To learn even more differences between a twin XL and full mattresses, take a look at the other factors setting them apart:

1. Price

In general, twin XL foam mattresses are easier on the wallet than full mattresses. For example, our most affordable twin XL mattress, the One, costs $875 USD, and it’s full size counterpart costs $1,125 USD.

Meanwhile, our luxurious twin XL Wave Hybrid mattress costs $2,395 USD ($2,995 CAD), and the full size costs $2,745 USD ($3,595 CAD). Although the price difference varies, a twin XL generally is best for single sleepers on a tighter budget.

2. Your Height

Due to the difference in length between a twin XL and full mattress, your height also factors into the decision. The length of a full bed is six feet three inches, so it may be long enough for most sleepers. However, single sleepers over six feet tall may prefer the extra five inches in length on a twin XL mattress. Since a twin XL comes in at six feet eight inches long, it offers enough length for cozy pillows and room to spare.

Still looking for more length? California King beds are seven feet long, making them an ideal fit for tall sleepers who want more spare space to share the bed with a partner.

3. Room Size

The size of your bedroom might also make a certain size the better choice for you. The general rule of thumb is that the width of your mattress shouldn’t be more than one-half the width of your bedroom. As a result, a twin XL mattress is better suited for bedrooms that are at least 8 feet by 10 feet. Since a twin XL has a smaller width than a full, it also fits comfortably in narrow bedrooms that are 7 feet wide or more. 

On the other hand, a full mattress works best in a bedroom that is 10 feet by 11 feet or larger. Single sleepers with smaller or more narrow bedrooms should opt for a twin XL bed, while those with bigger or wider bedrooms can easily fit a full size mattress.

4. Other Sleepers

Since the dimensions vary between a twin XL vs. full mattress, other sleepers sharing your bed may affect the size you choose. The added width of a full mattress makes it a comfortable choice for those who share the bed with a partner or children.

Meanwhile, single sleepers may not mind the narrower width on a twin XL. In fact, for those who share the mattress with a pet, the added length on a twin XL leaves more space for your pup to snooze at the foot of the bed. For extra room to sprawl, queen and king beds offer additional surface area.

5. Space to Sprawl 

The width and surface area of each bed size can also affect your choice. While twin XL beds are longer, full beds are 15 inches wider. Additionally, a twin XL mattress has a surface area of 3,040 square inches (21.1 square feet), while a full mattress has a surface area of 3,975 square inches (27.6 square feet). 

For those who like to sprawl out or move around in their sleep, a full bed provides more space. Other sleepers who prefer a snug fit won’t be bothered by the smaller surface area on a twin XL. 

6. Accessories

The cost and availability of twin XL vs. full bed accessories will vary as well. Just as with the mattress prices, twin XL accessories are a little less expensive than full accessories. For example, our twin XL Hyperlite™ sheet set costs $109 USD ($139 CAD), while our full sheet set costs $139 USD ($179 CAD).

Although the sheet sizes and costs differ, both twin XL and full mattresses need the same standard pillow size.

In addition, since twin XL accessories aren’t as common, you may have a harder time finding them in stores. Luckily, Casper offers a variety of premium sheets in every size.

Twin XL vs. Full: Pros and Cons

Now that you know the various differences between twin XL vs. full beds, it’s time to compare the options head-to-head. Check out the pros and cons of each bed size below:

Twin XL

Twin XL beds are most commonly found in college dorm rooms. That’s because they’re long enough to fit most heights and cost-effective enough to fall within most budgets.


  • More leg room for tall sleepers
  • Fits in small or narrow bedrooms
  • More affordable than other mattress types


  • Less surface area than a full
  • Makes finding accessories more difficult
  • Only suitable for single sleepers 

If you don’t mind the smaller surface area, those who opt for a twin XL mattress can save money without sacrificing bedroom space or leg room.


Full beds come with a larger surface area, making them an excellent fit for bigger rooms or shared sleeping arrangements. Since full beds are more common than twin XL beds, you won’t have to hunt around for sheet sets.


  • Fits multiple sleepers
  • Works well in larger bedrooms
  • Makes finding accessories easier


  • Costs more than a twin XL
  • Offers tall sleepers less leg room

Although full mattresses have a higher price tag than twin XL mattresses, they’re ideal for sleepers who want more space.

Twin XL vs. Full FAQs

Still unsure where you stand in the twin XL vs. full debate? Read through these answers to commonly asked questions to finally put the topic to bed.

How Much Bigger Is a Twin XL Than a Full?

A twin XL mattress is 38 inches wide and 80 inches long, while a full mattress is 53 inches wide and 75 inches long. A twin XL is five inches longer than a full, and a full is 15 inches wider. In total, the surface area of a twin XL is 3,040 square inches and a full is 3,975 square inches, meaning full beds have 935 square inches more space.

What’s the Difference Between a Twin XL and a Full?

The difference between a twin XL and a full is in the dimensions. Twin XL beds are longer than full beds, but full beds are wider. Due to their larger surface area, full beds cost more than twin XL beds. While the twin XL is best for tall solo sleepers, a full is best for shorter sleepers or those who share the bed.

Will Twin XL Sheets Fit a Full Bed?

Twin XL sheets will not fit a full bed. Since twin XL mattresses are five inches longer and full beds are 15 inches wider, the two mattress sizes need their own sheet sets.

Can Twin Sheets Fit a Twin XL Bed?

Many twin flat sheets may be able to fit a twin XL bed, but it’s a good idea to purchase twin XL fitted sheets so they don’t slip off overnight. Casper has a variety of twin and twin XL sheet sets that are sure to stay put while you sleep.

After considering the benefits and drawbacks of a twin XL vs. full bed, one option might just be the clear winner. From there, you’ll need to choose the type of mattress — including spring, memory foam, or hybrid — that’s right for you.

Whether you prefer a budget-friendly mattress that doesn’t sacrifice comfort or a luxurious bed that feels like you’re sleeping on a cloud, you can find your best bed at Casper. The Casper provides a seriously comfortable sleep at our lowest price, and our Wave Hybrid gives you the ultimate support for less aching and more sleeping — plus springs for added lift and airflow. 

Regardless of the size and type you pick, you can find the best bed for better sleep by scrolling through Casper’s top-rated mattresses.