What is the Size of a Twin Mattress

What is the Size of a Twin Mattress?

A Guide to Twin Mattress Dimensions and Finding the Perfect Fit for Your Needs

Intro - The Basics of Twin Mattress Sizes

Are you looking to outfit a new bedroom with a twin mattress? Or maybe you need a twin size bed for your child's first "big kid" mattress after graduating from the crib. A twin is one of the most popular mattress sizes on the market, especially for kids' rooms and guest bedrooms. But what exactly is a standard twin mattress size?

At Mattress To Door, we want to ensure you get the right twin mattress for your needs. In this guide, we'll cover everything you need to know about twin size mattress dimensions and how to choose the perfect twin for your space and sleep preferences.

Twin mattresses are on the smaller side, so they're a smart choice if you're working with a compact bedroom or need affordable guest beds. However, a twin bed may not be ideal for some adults long-term. That's where the twin XL mattress comes in - it offers a few extra inches in length while maintaining a slim twin size width.

Whether you're looking for your child's first "big kid" mattress or outfitting the guest room, read on for a complete guide to standard twin mattress sizes and tips for picking the ideal twin for quality sleep.

Twin Mattress Dimensions

Twin Mattress Dimensions

So what are the actual dimensions of a standard size twin mattress? Here's a breakdown of twin mattress measurements:

  • A twin mattress is 38 inches wide and 75 inches long. This makes a twin about 3 feet wide and 6.5 feet long.
  • The twin size is the smallest standard mattress size available.
  • It provides just enough room for one average-sized adult or child to sleep comfortably.

Some key details about standard twin mattress dimensions:

  • The width of a twin mattress is 38 inches. This slim width is perfect for saving space.
  • The length of most twin size mattresses is 75 inches, which is equal to 6 feet 3 inches long.
  • The total sleeping area of a twin is 38 inches wide x 75 inches long, which equals 2850 square inches or 19.6 square feet.

Twin size mattress dimensions compared:

Mattress Size

Width (inches)

Length (inches)




Twin XL












As you can see, a twin mattress is quite a bit narrower than other standard mattress sizes like queen and king. The twin XL mattress is the same width as a standard twin but 5 inches longer.

Measuring the dimensions of your mattress and bed frame is key to getting the right fit. So always bust out the measuring tape before purchasing your twin bed!

Matching Your Twin to a Bed Frame

Since twin mattresses are only 38 inches wide, you'll need a corresponding twin size bed frame. Here are some tips for matching your twin mattress to a frame:

  • Look for a twin or single bed frame with interior dimensions of approximately 38 inches wide x 75 inches long. This will match up with a standard twin mattress size.
  • Metal twin size bed frames often have adjustable side rails to accommodate both twin and twin XL mattresses.
  • For twin XL mattresses that are 80 inches long, look for a bed frame specifically labeled as "twin XL".
  • Measure the length, width, and height of your mattress to find a twin bed frame with a close match.
  • Allow for a few inches of mattress overhang for bedskirts or an aesthetic appeal.
  • Measure the inner dimensions of the frame to confirm the twin mattress will fit snugly.

Tips for measuring:

  • Use a soft measuring tape for accurate flexible measurements.
  • Measure width and length in multiple spots to account for any inconsistencies.
  • Measure height at the thickest point of the mattress.
  • Refer to the mattress specs for dimensions to compare.

Taking careful mattress and frame measurements ensures your twin or twin XL mattress will fit properly in your bed frame. This prevents the mattress from sliding around or having uncomfortable gaps.

Accurately measuring before buying gives you the confidence that your new mattress and existing or new bed frame will work together perfectly. Sweet dreams!

Who is a Twin Mattress Good For?

A twin size mattress can be a great fit for a variety of situations. Here is an overview of some of the most common uses for a twin mattress:

Bedroom Situations Where a Twin Mattress Works Well

Use Case


Toddler and Kids

Perfect transition from crib to first "big kid" bed. Fits well in kids rooms.

Guest Bedrooms

Takes up less space than larger mattresses. Allows for two separate beds. More affordable.

Compact Bedrooms

Makes the most of limited floor space compared to larger mattresses.


Fits nicely in the tight quarters of a recreational vehicle or camper.

Type of Sleeper Who May Prefer a Twin Mattress



Younger Child

Accommodates growing kids through tween and early teen years.


Twin XL provides extra length for taller teens.

Shorter Adult

Fits average height adults nicely.

Solo Adult

Enough room for one sleeper to spread out.


Great for temporary use such as overnight house guests.

While some couples share a twin bed, many prefer to upgrade to a queen or king mattress to have more room to stretch out. If you're taller than 6 feet, a twin XL mattress provides valuable extra length so your feet don't hang off the end.

Finding the Perfect Twin Mattress

When shopping for a twin mattress, here are some key factors to keep in mind:

Twin Mattress Price Range

Price Range



Entry-level coil and basic foam designs.


Thicker foam layers, gel infusion, and better coils.


Premium materials like latex, microcoils, etc.

Different Twin Mattress Designs




Traditional coil system provides bounce.


Contouring foam without springs for pressure relief.


Resilient, responsive, and breathable.


Combines coils and foam.

Memory foam

Slow-response foam adapts to your shape.

Common Twin Mattress Height Range




Lightweight and easy to rotate.


Balances affordability and comfort.


Maximum cushioning from thicker foam.

Don't forget to consider any special needs like adjustable base compatibility, temperature regulation, or edge support when selecting your ideal twin mattress.

Top-Rated Twins from Mattress To Door

Mattress To Door offers an outstanding selection of twin and twin XL mattresses at affordable prices. Here are a few of our top-rated picks:

Alice Plus Extra Firm Twin - $349

Alice Plus Extra Firm Twin - $349

  • Flippable design with firm and extra firm sides
  • Dual-sided use extends mattress life
  • 9-10" thickness

Back Support Perfect Orthopedic Reversible Twin XL - $699

Back Support Perfect Orthopedic Reversible Twin XL - $699

  • 14-15" thickness
  • Premium pressure relief smart foam
  • Anti-bacterial and anti-fungal
  • Dual-sided with firm and medium firm

Spring Free Silver Bamboo Twin - $359

Spring Free Silver Bamboo Twin - $359

  • Organic orthopedic support
  • Silver bamboo cover fabric
  • Designed for back support
  • 9-10" thickness

We offer convenient shipping, 90-night sleep trials, and 10-year warranties on all twin and twin XL mattresses. See our full collection online to find your perfect match!

Contact Mattress To Door to Find Your Ideal Twin

Have questions or need guidance choosing your twin size mattress? Get in touch with the sleep experts at Mattress To Door!

Give us a call or visit our website to:

  • Browse our full selection of twin and twin XL mattresses
  • Take our Mattress Finder Quiz for recommendations based on your needs
  • Speak with our Customer Sleep Advisors to get personalized advice
  • Take advantage of our 90-night trial period and free shipping

Finding your dream twin mattress is easy with Mattress To Door. Contact us and sleep better tonight!

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