Mattress Sizes and Dimensions: Which Bed Size Is Right for You?

/ April 16, 2021

When shopping for a new mattress, the first thing to determine is which size is right for you. To help you nail down whether a twin, full, queen, or king—or a variation on one of these standard bed sizes—is ideal for you, we've put together this comprehensive guide to mattress dimensions.

Common mattress sizes

How big are the most popular mattress sizes? Check out this handy bed size chart to find out.

In the below mattress size chart, see how many people can fit in each of these standard mattress sizes and the minimum recommended room size for each one.

Mattress size

Dimensions in inches

Dimensions in cm

Comfortably fits

Min. recommended room size

Twin size mattress

38 x 75 in

96.5 x 190.5 cm

1 person

7 x 10 ft

Twin XL size mattress

38 x 80 in

96.5 x 203.5 cm

1 person

7 x 10 ft

Full size mattress

54 x 75 in

134.5 x 190.5 cm

1 person

10 x 10 ft

Queen size mattress

60 x 80 in

152 x 203.5 cm

2 people

10 x 10 ft

King size mattress

76 x 80 in

193 x 203.5 cm

2 people

10 x 12 ft

Crib mattress

A crib mattress is the smallest standard mattress size. A firm crib mattress is a must-have for a baby to ensure safe and healthy sleep. If you're looking for the right sleep surface for your little one, then read our comprehensive guide to crib mattress dimensions.

Learn about the key features to look for in a crib mattress, the different types of crib mattresses that exist, and what other accessories can help your baby get safe sleep.

Twin mattress

A twin size bed is the second smallest standard mattress size. It's ideal for children because it accommodates their growing bodies and fits nicely into kids' bedrooms. It's also suitable for adults who live in studio apartments since it doesn't take up much space.

child lying on twin size bed with stuffed animal

If you're considering a twin mattress for yourself or your child, then check out our detailed guide to twin bed dimensions. Learn about the pros and cons of twin size beds, the differences between twin mattresses and other popular mattress sizes, how to choose the right bedding for a twin mattress, and more.

Full mattress

A full mattress offers slightly more room than a twin but still fits well into smaller bedrooms. That means it's great for growing kids or small apartment dwellers who sleep solo.

person lying on full size bed with guitar next to them

Thinking about buying a full size mattress? Take a look at our in-depth guide to full bed dimensions. It highlights the key considerations you need to take into account when determining whether a full size bed is right for you. Learn about the benefits and drawbacks of full mattresses, the differences between full mattresses and other standard mattress sizes, and how to select the right bedding and accessories to go with a full size bed.

Queen mattress

A queen mattress is the most popular of all mattress sizes, and for good reason. It provides generous space for single sleepers yet it's still roomy enough for two people. Plus, it fits comfortably into most bedrooms.

couple lying on queen size bed

If you're thinking about purchasing a queen size mattress, then check out our guide to queen bed dimensions. In this guide, find detailed information about the pros and cons of queen size beds, learn how to determine whether a queen size mattress is right for you, and see how queen size beds compare to other common bed sizes.

King mattress

A king mattress is the largest of all bed sizes. It's an excellent choice for couples, especially if you have kids and pets that like to pile into your bed and cuddle. It'll also help fill up space in a large bedroom.

family lying in king size bed

Contemplating a king size mattress? Read our guide to king bed dimensions to learn about the pros and cons of king size beds and find tips for determining whether this mattress size is the right one for you. You'll also learn about specialty king mattress sizes and how king size beds compare to other standard bed sizes.

How to choose a mattress

Here's what to consider when contemplating all the different mattress sizes.

Your body size

If you’re over 6 feet tall, then a twin or full size mattress may not be long enough to allow you to sleep comfortably. Because these mattress sizes are both only 75 inches long (which translates to 6 feet 2 inches), your feet may dangle over the bed. If this is the case, consider a twin XL mattress, which is the same width as a standard twin but 5 inches longer.

Queen and king size beds also offer an additional 5 inches in length over twin and full sizes. They’re also wider, making them a better option for couples, anyone who wants extra space to spread out, or those with larger body sizes. (Learn about the best mattress for heavy people.)

Your room size

Smaller mattress sizes, like twins and fulls, fit better into smaller bedrooms. That's why they're a good option for kids' rooms as well as studio apartments. Twin and twin XL mattresses can fit into bedrooms as small as 7 x 10 feet. Full mattresses can fit into bedrooms as small as 10 x 10 feet.

illustration with full size bed in it showing room dimensions of 10 feet by 10 feet

Queens and kings, on the other hand, fit nicely into larger bedrooms. Queen size beds can fit into bedrooms as small as 10 x 10 feet, while king size beds can fit into bedrooms as small as 10 x 12 feet. Cal kings, which are 4 inches longer and 4 inches narrower than standard kings, can fit into bedrooms as small as 12 x 12 feet.

Your sleep position

If you’re a combination sleeper—someone who switches positions throughout the night—a full size bed will give you ample room to move around as a solo sleeper. If you sleep with a partner and either or both of you move around while you sleep, then a queen or king will ensure you won’t disturb each other.

Number of sleepers

Do you sleep alone or with a partner? Solo sleepers can do well on a full size bed, while twins and twin XLs are great options for kids and teens.

Queen and king size beds are your best bet if you sleep with a partner. With a queen size bed, you get 30 inches of space per person, and with a king size bed, each of you gets 38 inches of space to yourselves.

If you and your partner have different sleep preferences, then think about getting a split king. This setup consists of two twin XLs side by side. With a split king, each of you can choose your preferred mattress firmness.

Your budget

Smaller mattress sizes cost less money than larger ones. For example, a full size mattress is typically 10-15% less expensive than a queen size bed, while a queen size bed is usually around 25% less expensive than a king size bed.

Keep in mind that in general, an innerspring mattress costs less than a memory foam mattress or latex mattress, but each mattress type has its advantages. Choose the size that best fits your sleep needs—and your financial needs.

Which mattress size is right for me?

Here’s a quick primer on who each mattress size is best for so you can choose the right one for you.

Type of person

Mattress size

Kids and teens

Twin or full

Teens or solo sleepers over 6’

Twin XL

Solo sleepers of short or average height


Couples with average size bedrooms


Couples with kids and/or pets or larger bedrooms


Taller couples

California king

Couples with different sleep preferences

Split king

Kids and teens

A twin mattress is the typical choice for a child's first "grown-up" bed. For siblings in small bedrooms, twin beds can be stacked as bunk beds.

bunk beds with twin size mattresses with children lying on the beds

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. In that case, a twin XL, which is 5 inches longer than a standard twin, might be a better option. In fact, the twin XL mattress is a popular choice in dorm rooms due to its added length and ability to fit into a tight space.

illustration showing the differences between twin vs twin xl bed sizes

A full size bed (also known as a double bed) is also great for kids and teens. It's 16 inches wider than a twin mattress, making it a bed a child won't outgrow until they leave home. That said, it's the same length as a twin bed, so if you have a child or teen on the taller side, then it may not offer them enough sleep surface.

Solo sleepers

At 54 x 75 inches, a full size bed offers plenty of room for single adults to sleep comfortably. If your bedroom is particularly small, then consider a twin, which fits nicely into small spaces at 38 x 75 inches.

full size mattress with single person lying in it

On the taller side? A twin XL, which is 5 inches longer than a twin and full, might be good in this instance.


A queen size mattress is the most popular choice for couples. In a queen size bed, each sleeper gets 30 inches of space to themselves. If you’re a combination sleeper, you should have enough room in a queen size bed so you won’t disturb your partner.

queen size mattress with couple lying in it

At 16 inches wider than a queen, a king size mattress is ideal for couples who want a generous amount of space. In a king size bed, each sleeper gets 38 inches of space to themselves. Because it's so large, a king mattress also offers plenty of room for kids and/or pets to pile onto the bed.

Unique mattress considerations

Not everyone will get their best sleep on one of the standard bed sizes. In certain circumstances, a non-standard mattress size will be a better option for you. Here's a rundown of some of the special mattress sizes that exist.

Twin XL

Does your teenager seem to be heading for the NBA? Get them a twin XL mattress. A twin XL is the same width as a standard twin mattress (38 inches) but 5 inches longer, coming in at 80 inches long.

Twin XLs provide enough legroom for anyone up to 6 feet 7 inches tall, so your teen won’t have to worry about their feet hanging off the bed.

California king

For tall couples (or couples where one partner is really tall), a California king mattress could be the right choice. Unlike a regular king mattress (76 x 80 inches), a California king measures 72 x 84 inches.

So if you don’t mind sacrificing a little width in exchange for an extra 4 inches in length, you’ll find it a much more comfortable setup.

Split king

If you and your significant other have divergent opinions on what mattress comfort level feels best, then think about a split king mattress. A split king is two individual twin XL mattresses placed side by side. Together, they make up the dimensions of a standard king mattress (76 x 80 inches).

Getting a split king means you can choose two different firmnesses, so you each end up with what you want.

Split top

A variation on the split king mattress is a split top mattress. Designed to be used with an adjustable base, a split top allows each partner to set their head position. If one of you snores, for instance, or one likes to stay up late reading in bed, a split top can help keep the peace.

Another benefit of a split top is that it allows for some individual customization without a full separation down the middle. (If you opt for a split top, keep in mind you’ll need to purchase special sheets to fit it.)


If you’re a young professional moving into a studio or loft, then you might not have room for a mattress and a couch. You don’t have to sacrifice one for the other, though—consider getting a daybed instead. Daybeds—couches that can be used as beds—are an extremely versatile piece of furniture and a great option for solo sleepers (especially if you don’t want to have to open and close a convertible sofa every day).

Daybeds come in a variety of styles and designs, can have arms or railings on both sides, and typically have a twin mattress. Dress them up in sheets and your favorite duvet and you’re ready to doze off. Remove all that and they become a couch again. Some daybeds even feature storage options—an invaluable feature for small living spaces.

Choosing the right mattress for your room

When assessing mattress dimensions to determine which bed size is right for you, it's important to check how well it'll fit into your bedroom.

How to measure your bedroom for buying a mattress

Start by using a tape measure to get the dimensions of your entire bedroom (the width, length, and doorframe measurements).

Once you've determined that a particular bed size will fit inside your bedroom, focus specifically on the dimensions of the wall you plan to set your bed against. Take windows, doorframes, furniture, and any other bedroom features into account to ensure your chosen mattress size will fit comfortably. If you're going to be using a headboard, you should take that into account too.

To figure out what kind of space you’ll have to walk around your bed, use painter's tape to mark where the bed will go. Ideally, you'll want at least 3 feet of space to walk around either side of the bed as well as the foot of the bed. You'll also want to make sure you can fully open closet doors, wardrobe doors, and dresser drawers and that nightstands fit comfortably.

Able to move around freely? You're good to go. Room feel too cramped? Consider sizing down to the next size.

Questions about mattress sizes

Which mattress size is best for a small apartment bedroom? Are there different pillow sizes to go with the various mattress sizes? We're answering the most common questions about mattress dimensions to help you find your perfect match.

What's the largest mattress size?

The largest mattress size is the Alaskan king mattress. It measures 108 x 108 inches (that's 9 x 9 feet). The Alaskan king is 36 inches wider and 28 inches longer than a standard king mattress. If you're over 6 feet 6 inches tall, you'll appreciate the extra legroom provided by an Alaskan king. To accommodate this mattress size, your bedroom should be at least 16 x 16 feet.

What's the most popular mattress size?

The queen mattress is the most popular mattress size. That's because it's the ideal choice for many people. Measuring 60 x 80 inches, a queen size bed offers generous space for solo sleepers yet is still roomy enough for two people. It's also spacious enough for taller sleepers and suitable for bedrooms of many different shapes and sizes.

What mattress should I get for a small apartment bedroom? What about a studio apartment?

Twin and full mattresses are both suitable mattress sizes for a small apartment bedroom or studio apartment. A twin mattress measures 38 x 75 inches and can fit comfortably in rooms as small as 7 x 10 feet.

A full mattress is slightly wider, measuring 54 x 75 inches, and can fit comfortably in rooms as small as 10 x 10 feet. Thanks to the added width over a twin, it's roomier for solo sleepers.

A twin XL, a variation on the standard twin, is commonly used in dorm rooms. As it's only 38 inches wide, it easily fits in small spaces. But since it's 5 inches longer than twin and full beds, it's ideal for taller people.

What mattress size should I get for a guest bedroom?

A queen size mattress, which measures 60 x 80 inches, is a solid choice for a guest bedroom. It can accommodate two adults and also leaves enough space in the room for additional furniture, like a bench or chair.

Do mattress lengths and widths have anything to do with thickness?

Mattress length and width aren't the same as thickness. Mattress thickness refers to the height of a mattress. The average mattress height, or thickness, is 8 to 12 inches. These days, you can also find plenty of 14-, 16-, and even 18-inch mattresses.

A thicker mattress might be right for you if you have a larger body, want to get on and off the bed with ease, or your bed frame or headboard demands it.

Do I need sheets and a comforter that are the same size as my bed?

You should always choose sheets and a comforter designed for your specific mattress size. That way you won't have to deal with too-small bedding that hangs short or too-large bedding that drapes onto the ground.

You can find sheet sets in every standard mattress size, from twin to California king. Sheet sets include one flat sheet, one fitted sheet, and one or two pillowcases. Sheets will typically be the same dimensions as your mattress size.

When it comes to the fitted sheet specifically, check the depth to make sure you'll be able to fit it securely around the corners of your mattress. If you have a thick mattress, look for a deep pocket fitted sheet that will accommodate the thickness of your mattress.

Comforters are usually slightly larger than their corresponding mattress sizes. Comforter sizes are generally in the following range:

  • Twin: anywhere from 66 x 86 inches to 68 x 88 inches
  • Twin XL: 68 x 90 inches
  • Full: anywhere from 81 x 86 inches to 84 x 88 inches
  • Queen: anywhere from 86 x 96 inches to 88 x 100 inches
  • King: anywhere from 102 x 86 inches to 102 x 88 inches
  • Cal king: anywhere from 107 x 96 inches to 110 x 98 inches

Are there different sized pillows as well?

Pillows come in different sizes. Standard pillows measure 20 x 26 inches and are suitable for most mattress sizes. Standard pillows fit well inside queen size pillowcases. Super-standard pillows are another common option and measure 20 x 28 inches. They also fit into queen size pillowcases. King size pillows are the largest pillows. They measure 20 x 36 inches and make the most sense for king size bed. King size pillows fit nicely inside king size pillowcases.

What are the standard U.S. mattress sizes?

The standard U.S. mattress sizes are as following:

  • Twin mattress: 38 x 75 inches
  • Twin XL mattress: 38 x 80 inches
  • Full mattress: 54 x 75 inches
  • Queen mattress: 60 x 80 inches
  • King mattress: 76 x 80 inches
  • California king mattress: 72 x 84 inches

Are bed frame sizes standardized?

Mattress sizes and bed frame sizes are usually the same. However, keep in mind that some bed frames are 2-5 inches larger than the mattress to accommodate a headboard and/or footboard.

Sleigh beds and wide floating platform beds, for example, need more space than standard bed frames. Because of this, it's always a good idea to measure your bedroom first and double-check the dimensions of the bed frame before buying.

How do you know what size mattress to get?

The right mattress size for you depends on a variety of factors. You'll want to consider your body size, room size, how many people will be sleeping in the bed, and your budget.

Smaller bed sizes, like twins and fulls, take up less space, which can be great if your bedroom is small. They're also less pricey than larger mattress sizes. But they don't fit more than one person—and if you're on the larger size or you move around while you sleep, you may not be so comfortable even if you sleep alone.

Larger bed sizes, like queens and kings, take up more space and cost more money, but they also offer much more room. If you have a larger bedroom, switch positions while you sleep, sleep with a partner, or have kids and/or pets that like to get into bed with you, then one of these larger mattress sizes may be ideal for you.

christina heiser

Christina Heiser

Christina Heiser is the senior content manager at Saatva. She has held previous positions at Everyday Health, Women's Health, and L'Oréal. When she's not working, you can find Christina checking out the latest boutique fitness classes in New York City, cheering on her college basketball team (go Red Storm!), and trying new beauty and wellness trends.

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