Twin vs Full Mattress Size: Which Mattress Is Right For You?

Grace Struth

Sleep Content Lead

Wondering whether a twin vs full mattress is the right fit for you? You’re not alone. Choosing between a full vs twin mattress is like picking between a cozy coupe and a spacious sedan—there are benefits to both, so it all comes down to your needs.

Understanding these mattress sizes is key, whether you’re sprucing up the kids’ rooms, decking out a guest space, or just aiming to upgrade your own snooze zone. Let’s dive into the details of full vs twin mattresses and find your perfect fit.

Looking for other mattress sizes? Check out our guide to mattress sizes in Canada.


FeatureTwin MattressFull Mattress


38″ wide x 75″ long

53″ wide x 75″ long

Surface Area

19.8 square feet

28.1 square feet

Ideal For

Solo sleepers
Small rooms

Solo sleepers who love extra space
Couples who like to cozy up
Larger rooms

Room Size

At least 7′ x 10′

At least 10′ x 10′


Fits in small spaces
Budget friendly
Great for kids

More room to stretch
Versatile for guest rooms
May fit more than one person


Might be too narrow for some adults

Takes up more room
Slightly higher price tag


What size is a twin mattress?

A twin mattress measures a neat 38 inches by 75 inches. This is the smallest standard mattress size, ideal for snug spaces, kids’ rooms, or that cozy guest nook. Perfect for bunk beds, daybeds, and those charming small bedrooms, a twin mattress is a go-to for anyone looking to save space without skimping on comfort. It’s ideal for both kids and adults flying solo.

READ MORE: Get our ranked list of the best twin mattresses in Canada


illustration showing a child lying on a twin mattress, with 75


What size is a full mattress?

A full mattress (or double bed) measures 53 inches by 75 inches. It offers that extra width for stretching out. Ideal if you love to starfish in your sleep or if you like your space but don’t mind a cuddle, a full mattress is a great choice for growing kids and teenagers. It’s also a common choice for guest rooms.

READ MORE: What’s the difference between a full mattress vs double mattress size?


illustration showing an adult and a child lying on a full mattress, with 75


What’s the difference between a full-size bed vs twin-size bed?

While both mattresses have the same length, a full mattress is 16 inches wider than a twin mattress. The full mattress provides a wider sleeping area, making it more versatile for different body types, sleeping situations, and room sizes. However, it requires more square footage, meaning a twin size is best for smaller sleepers and spaces.


What mattress size should I choose?

Not sure whether to get a twin or full bed? Think about your space, your sleep habits, and who will be sleeping on this mattress. Considerations like cost, room size, and future needs (like a kid’s growth spurt or a potential move) can all play into this decision, too. We have broken down some of the factors below to help you decide.


Cost and Availability

Generally, twin mattresses are more budget-friendly due to their smaller size. They’re a great option if you’re looking to furnish a child’s room or a small guest room without breaking the bank.

Twin mattresses are also widely available from several brands. If you’re shopping for kids, there’s a broader range of twin beds designed specifically for children, including themed beds and those with additional safety features. You can also easily find twin bedding in a broad range of styles featuring everything from superheroes to cartoon dogs.

Full mattresses come with a slightly higher price tag, reflecting their larger size. They’re an investment, especially if you’re looking for a mattress that can accommodate growth spurts or a move from a solo sleeper to a cozy duo.

Also readily available from many retailers, full mattresses offer a wider variety of options catering more to adult preferences, including firmness and support. Bedding choices also bridge the gap between smaller and larger mattress sizes, with designs that appeal to pre-teen, teenaged, and adult sleepers.

Douglas Original, our Top Pick 2024, is an accessibly priced foam mattress that comes in a wide range of sizes, including twin ($599) and full ($699). Or, if you’re on the hunt for an even more affordable foam mattress, you might prefer Juno, priced at $399 for a twin and $479 for a full mattress.


Sleeper’s Height and Sleep Position

Twin mattresses are ideal for a single child or adult up to about 5’9″ in height. The narrower width may limit movement if you are an active sleeper or tend to change positions frequently.

Full mattresses are still suitable for individuals up to 5’9″ tall, but they come with extra width that can accommodate different sleep positions more comfortably.

Whether you’re a back, side, or stomach sleeper—or you prefer more of a starfish pose—you should find a full-size mattress comfortable in any position. This mattress can also comfortably fit multiple people, such as two children or an adult and a child.

READ MORE: Twin vs twin XL: which is better for you?


Room Size and Space

The twin mattress measures a compact 38 inches wide by 75 inches long, making it perfect for smaller rooms. Placing a twin bed in the middle of a room at least 7 feet by 10 feet, you’d have about 2 to 2.5 feet of space on either side and at the foot of the bed. This allows enough space for essential furniture, like a nightstand or dresser, and easy movement throughout the room.

A full mattress is typically 53 inches wide and 75 inches long, providing more space for you to stretch out, compared to a twin mattress. Full beds are better suited for larger bedrooms where space isn’t as much of a concern. For a full mattress, a room size of at least 10 feet by 10 feet is recommended. This ensures that the bed does not take up too much space and there is enough room for other furniture.

If you place a full mattress in the centre of a room of this size, you should have approximately 2 feet of space on either side and 3 feet at the foot of the bed. This allows enough room for you to move comfortably around the room, as well as space for a dresser and a nightstand or two.

When evaluating your room space for a full-size bed vs a twin-size bed, consider the layout and placement of windows, doors, and closets. These can significantly impact usable space. In smaller rooms, strategic furniture placement and multifunctional pieces (like beds with built-in storage) can help maximize the available area.


Future Planning

If you have kids transitioning from cribs, twin beds are an excellent choice for them. This mattress size has plenty of room for them to change positions while sleeping. Depending on the child’s size, you may also have enough room for storytime and bedtime cuddles before they go to sleep independently.

Keep in mind that you might need to upgrade to a larger mattress size as kids grow. If you have kids closer to teenage years, or if your kids will be sharing a bed for a while, consider a more future-proof option like a full mattress instead.

Full mattresses can accommodate growth spurts and can transition from a child’s mattress to a guest bed. Your child can even bring the bed to their first apartment once they enter adulthood.

(Not sure what kind of mattress is right for you? Check out our guide to types of mattresses to help you decide on the right option.)



How much bigger is a full mattress vs a twin?

A full mattress is 16 inches wider than a twin mattress, at 53 inches wide by 75 inches long. In comparison, a twin measures 38 inches wide by 75 inches long. Both mattresses are the same length, but a full mattress is significantly wider to allow for greater movement and even multiple sleepers—for example, two children, or a child and one parent.

Do two twin beds make a full size?

No. Combining two twin beds (38 inches wide by 75 inches long) won’t align with a larger standard mattress size, and definitely not a full-size mattress. However, two twin XL mattresses combined are the same dimensions as a single king-size mattress (also known as a split king).

Is a full bed the same as a double?

Yes, a full bed is the same as a double bed. “Double” is the word most often used in Canada instead of “full.” Don’t worry—if you buy full-size sheets or a full frame, they will fit your double bed (and vice versa).

Can a full bed sleep 2 people?

A full bed can sleep two children, or a child and one parent. Two adults may be able to sleep on a full-size mattress for a night, but sleep quality can suffer due to the lack of extra space. Unless you and your partner are serious cuddlers, you likely won’t be comfortable sleeping on a full mattress long-term.


The decision between a full-size mattress vs twin depends on your current needs, future considerations, and the constraints of your living space. So, take a moment to consider not just the immediate appeal but also the long-term benefits of your choice.

Remember, the best option is the one that is right for your needs and will best ensure a good night’s sleep.