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twin vs full mattress dimensions infographic

Twin vs. Full: What’s the Difference?

Is your child ready for their first “big-kid bed?” Twin and full size mattresses are both ideal choices for growing children. Beyond kids, they can also both be good picks for solo sleepers who want to save on space. How are you supposed to choose between the two, though? While twin and full mattresses have a lot in common, they have a few key differences you’ll want to consider before making your decision.

Is a twin bed or a full size mattress right for you? Our twin vs. full size bed guide will help you determine just that.

twin vs full - twin dimensions illustration

What are the benefits and drawbacks of a twin bed?

Before you decide whether a twin or full size bed is right for you, consider the pros and cons of a twin mattress.

Pros of a twin

  • A twin mattress is great for growing children. It’s an ideal size between toddler beds and the full size mattress they may use as teenagers. It also fits nicely into kids’ rooms. “Twin beds are so fantastic for kids’ rooms because you don’t need much space for them,” says Prudence Bailey, founder and principal designer of Prudence Home + Design in Connecticut. “They can function as a bed or even a day bed.”
  • Bailey adds that having two twin mattresses in a room is perfect for kids who love throwing sleepovers—or siblings who share a bedroom.
  • A twin mattress size is versatile—it can be used in bunk beds, day beds, and for solo sleepers in studio apartments. (Keep in mind, your bedroom should be 7 feet by 10 feet at minimum to fit a twin size mattress.)
  • Since a twin mattress is the smallest mattress size, it naturally comes with the smallest price tag, and it’s a piece of cake to move.

Cons of a twin

  • It’s too small for two. Given that a twin mattress is only 38 inches in width total, it doesn’t afford much space for two people. A queen size bed, which measures 60 x 80 inches, is the ideal mattress size for couples because each sleeper gets about 30 inches of space to themselves.
  • Because it’s only 75 inches long (which translates to 6 feet 2 inches), a twin size mattress may not be long enough for taller teens or adults. If your teen is tall, consider a twin XL mattress, which is the same width as a standard twin but 5 inches longer.
twin vs full - full dimensions illustration

What are the benefits and drawbacks of a full bed?

Just as a twin size mattress has its pros and cons, so does the full bed.

Pros of a full

  • Full size beds offer an ideal situation for solo sleepers. If you live by yourself, a full size bed will provide ample room.
  • This mattress size is a natural fit in downsized spaces. Those who live in apartments or who have small bedrooms will find that a full size bed is a good option. A full size bed can fit comfortably into a bedroom that’s at minimum 10 feet by 10 feet.
  • Full size beds are a great option for children. They’re the same length as standard twins but roomier.
  • They’re also usually less expensive than their larger counterparts and easier to transport than bigger mattresses.

Cons of a full

  • They don’t provide adequate space for most couples. In a full size bed, each person will only have 27 inches of space for themselves. Queen and king size beds are much roomier, offering 30 inches and 38 inches per person, respectively.
  • Since they’re not especially long, full size beds aren’t a great option for tall folks. A full size bed is just barely over 6 feet in length, so you’re looking at feet hanging over the edge of the bed if you’re a few inches over 6 feet tall. Taller teens will be better suited to a twin XL mattress—and taller adults who have the space should opt for a queen size bed. Both of those mattress sizes are 5 inches longer than a full.
  • Full size mattresses are more expensive than standard twins. If you’re buying your child their first bed, you’ll have to spend a little more to get a full size mattress over a standard twin.

Our Best Mattress for Children, Available in Twin and Full





Saatva Youth


This dual-sided innerspring mattress provides optimal support and comfort to children of all ages. Simply flip it over from the 3+ side to the 8+ side when your child is ready.


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What’s the difference between twin and full size beds?

From dimensions to minimum recommended bedroom size, here are the biggest differences between these two mattress sizes.

Twin vs. full dimensions

A twin size mattress measures 38 inches wide by 75 inches long. A full size mattress measures 54 inches wide by 75 inches long. With a full size mattress, you get an additional 16 inches in width.

Additional Saatva Mattresses Available in Twin and Full




Saatva Classic


Our flagship luxury mattress is expertly engineered with coil-on-coil construction for durability, a layer of memory foam for enhanced back support, and a cushiony Euro pillow top for extra comfort.


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Loom & Leaf Memory Foam


Premium memory foam, handcrafted in the U.S. with eco-friendly materials. Breathable organic cotton, cooling spinal gel, and layers of high-density support foam assure a cool, comfortable night’s sleep.


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Zenhaven Latex Mattress


100% Talalay latex responds to every curve for pressure-free support and responsive comfort. Talalay latex is supple, resilient, and durable, for the ultimate in elevated sleep. (It’s naturally hypoallergenic too.)


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Twin vs. full comparison chart

We’ve put together this handy comparison chart to help make your choice between a twin and full easier.

ComparisonTwinFull
Width38″54″
Length75″75″
Min. recommended room size7′ x 10′10′ x 10′
Who it’s best forYoung children

Solo sleepers with very small bedrooms
Children and teens

Solo sleepers who want a little more room to move around
DrawbacksNot enough room for couples

Not long enough for anyone over 6 feet tall
Not very roomy for couples

Not long enough for anyone over 6 feet tall

More expensive than a twin

Still not sure which mattress size is right for you? Check out our mattress dimensions guide for helpful advice.