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The Ultimate Mattress Size Chart and Bed Dimensions Guide

The different sizes of beds seem easy enough to understand, right? The truth is that choosing the right size for your mattress can be more complex than you may think. Does it fit comfortably in my bedroom? Is there enough legroom? The list goes on.

To help you make a decision when selecting the best mattress for you, we’ve put together a summary of the most common measurements you will see online and in a store so you can have an idea if it’s a perfect bed for you and your bedroom.

Mattress Size Dimensions

Mattress Size Graphic from Sleep Advisor
TypeSize (Inches)Suitable For
Small Single or Cot30 x 75Babies and toddlers
Twin38 x 75Kids that have outgrown their cribs and single adults living in smaller apartments. It’s also great for a daybed or bunk bed.
Twin XL38 x 80Kids, taller adults, and those who want to use an adjustable bed frame
Full54 x 75Good for a single sleeper, someone with children or pets, and couples that do not require a lot of legroom.
Full XL54 x 80More than enough for a single sleeper. Also good for couples that need more legroom but can not accommodate queen size due to bedroom limitations.
Queen60 x 80Frequent choice and a perfect size for most couples that do not need a lot of sleeping space. If you plan to sleep alone this is more than enough.
Olympic Queen66 x 80Six Inches wider than a standard queen, it makes it nice for someone who doesn’t want to upgrade all the way to a King.
King76 x 80Great choice for couples who want maximum personal sleeping space. Check our room dimensions scale guide to ensure it will fit in your bedroom.
California King72 x 844 inches longer but 4 inches narrower than a standard king type. Good for taller individuals.

Sleep Advisor’s Lead Product Testers Explain Mattress Sizes

Small Single Bed (Cot) Dimensions

This is the size of crib mattresses. They can also serve as toddler beds in most cases once your baby outgrows the cot. Typical measurements are 30 inches wide by 75 inches long

.If this is what you’re looking for, check out our Best Crib Mattresses here.

Illustrated image of Small Single Cot Dimensions

Twin Bed Dimensions

A typical Single, Twin, or Bunk mattress is 38 inches wide by 75 inches long. You’d be hard-pressed to find a bed that is any smaller than this one, other than a toddler bed or crib.

Typically, a Twin mattress is ideal for children who have outgrown cribs and toddler beds, and who are now ready to graduate to a larger mattress.

Additionally, it works well for those who sleep in tight quarters, have small rooms, or share a room with a sibling or roommate. Twin beds are often used as day beds, bunk beds, dorm room beds, and guest room beds.

Illustrated image of Twin size bed dimensions in inches

Explore Now: Best Twin Mattress

Twin XL

There are subcategories of Double beds to consider as well. The Twin XL is typically 80 inches long while still maintaining the 38-inch width. If you’re an adult looking for a bed that saves space and still is a comfortable choice, a Twin XL mattress may be perfect for you.

Find Out More: Twin XL vs. Twin

Twin XL Bed Dimensions Illustration

Can I Use a Twin XL Mattress on a King Size Bed Frame?

Yes, you can use two Double/Twin XL beds on a King frame. If you are in a relationship where one partner requires a different firmness than the other, two separate mattresses could be a helpful solution.

Explore the best Twin XL beds and best bed frames.

Full Bed Dimensions

Full-size mattresses measure 54 inches wide by 75 inches long, and these are also sometimes referred to as “Standard Double.” The Full size is sufficient for adults who need more room than what a Twin can offer.

If you are in a relationship, this may not be the best choice for you, as the fit will be more snug. However, some couples that need to save money may prefer the price tag of a Full bed compared to the King and Queen models. Additionally, if you have a pet or child that sleeps next to you, you may want to consider a wider option.

Illustration of full size bed dimensions in inches

We suggest the Helix Kids for a great Full-size mattress. The Helix Kids is specifically designed for children, and getting this bed in Full size allows the parent to lie next to the child in the event of nightmares or difficulty sleeping.

We also suggest the WinkBeds Original for a great Full-size mattress. Some couples may opt for a Full-size mattress, and the WinkBed’s versatility for multiple sleep positions combined with solid edge support is ideal for partners.

Full (Double) XL

A Full XL option is 54 inches by 80 inches, giving you an extra 6 inches of leg space. If you do not require extra width but want some more room for your legs, this is a perfect option.

Want to read more? Check out our Double vs. Full mattress comparison.

Double Bed XL measures in inches

Queen Bed Dimensions

Queen mattresses are 60 inches wide by  80 inches long. They are typically long and wide enough to suit most sleepers. For those who sleep with their spouse, child, or pet, a Queen bed might be perfect. 

Check out some Queen mattresses options here.

When looking at these larger sizes, it becomes necessary to consider the living space. Queen sizes and up take up more room than the Twin or the Full, and your ability to freely move around the bedroom may become restricted. If you have a larger bedroom, then this won’t be a factor.

Image showing a queen size bed dimensions in inches

We suggest the DreamCloud Original for a great Queen-size mattress. Most shoppers who get a Queen bed are adults, and the DreamCloud offers a luxurious design that includes a cashmere blend cover, pillowtop surface, gel memory foam, and pocketed coils. 

We also suggest the Nectar Original for a great Queen-size mattress. The Nectar excels at categories like pressure relief, support, and motion isolation for more comfortable rest.

Looking for more info? View our in-depth Queen vs. Full bed comparison.

Olympic Queen

Olympic Queen mattresses are slightly wider and measure 66 inches wide by 80 inches long. An Olympic Queen is perfect for those who don’t want to upgrade all the way to a King but could use more width.

Image showing the size of a Olympic Queen type

King Bed Dimensions

A standard King size mattress is 76 inches wide and 80 inches long. We recommend avoiding this size unless your room is at least 12 by 12 square feet. This is a perfect mattress for couples who sleep with their kids or pets and want more room for themselves.

If you want to compare this to other options, a King is the same as two Twin XL beds.

We suggest the Saatva Classic for a great King-size bed. The Saatva’s construction includes premium support thanks to the dual coil unit, so those sharing a bed or who carry more weight shouldn’t experience much sagging. 

King Bed Dimensions Illustration

We also suggest the Nolah Evolution for a great King-size mattress. The Evolution is equipped with multiple advanced cooling features, so couples are less likely to overheat during the night.

Looking for more details? Read our full King vs. Queen bed comparison.

California King Bed Dimensions

The California King mattress is 72 inches wide by 84 inches long, making it one of the biggest options on the market. This size is perfect for active sleepers, tall people, and couples with kids or pets. A California King is 4 inches longer but 4 inches narrower when compared to a standard King.

We recommend you have a large room of at least 12 by 12 square feet for a California King mattress.

View Our Full Comparison: California King vs. King mattress size

Illustrated image of California King measurements

How to Choose the Right Mattress Size

There are certain things to keep in mind when choosing your mattress size. Here, we’ll look more closely at these factors to help you decide which mattress size is right for you. 

Bedroom Size

If the bedroom you’re working with is small, it makes sense to buy a smaller mattress so you’ll have more floor space in the room. The smallest mattress is the Twin mattress, followed by the Twin XL, and then the Full. 

If you have a larger room, you won’t have to worry about using a small bed. Most people opt for a Queen-size bed, but if you have plenty of space, you can go for a King — especially if you want some space when sharing the bed. 

Just make sure you are carefully measuring the room with the bed’s dimensions in mind. You’ll need to have at least 2-3 feet on each side of the bed so you can comfortably move around the space. 


Generally speaking, the smaller the bed, the lower the price will be; the larger the bed, the higher the price will be. This will also be true of the sheets and bedding you’ll use on the bed since smaller bedding will be less expensive than larger bedding.

If you’re on a tight budget, you may want to opt for the smallest bed you’d feel comfortable sleeping on to save money on the bed itself, as well as the bedding. However, if budget is not a concern, we’d recommend getting whatever size bed works best for you and your bedroom.

If you’re being budget conscious with your next mattress purchase. Check out our expert tested picks in our Best Budget mattress list.

The Age of the Sleeper

Certain mattress sizes tend to work better for different ages. For example, a Small or Single mattress is designed for toddlers, and a Twin is often used for children or teens. A Twin XL can be a great choice for taller teenagers or single adults with limited bedroom space (these are often used in dorms), and a Full is a great choice for both children and adults who are sleeping solo. 

This is not only because children tend to have smaller bedrooms than their parents, but also because children will have smaller bodies as well. The general rule is that the bigger a person’s body, the bigger their mattress will need to be. 

More: Best Mattress for Kids and Beds for Teenagers

Couple or Solo Sleeper?

The mattress size you choose will depend heavily on whether you’re sharing the bed or sleeping alone. 

For those sleeping alone, anything from a Twin to a Queen should be comfortable. Keep in mind that if you’re on the taller side, you’ll need to choose a mattress that’s at least 80 inches in length. 

For those sharing the bed, either with a partner, a child, or perhaps your pets, you’ll want more space. Some people can comfortably share a Full bed, but it is a tight squeeze. We’d recommend going for at least a Queen if you’re sharing the bed; if you each want more space to spread out, a King would be even better. 

Mattress Setup

Unfortunately, setting up the mattress is something a lot of people don’t think about until the mattress arrives on their doorstep and they have to somehow get it into the room. 

If the journey to the bedroom is extremely narrow or awkward or the doorway is small or at an angle, this might impact the size of the mattress you can get. Additionally, the bigger the mattress is, the heavier and more cumbersome it will be to move. 

Luckily, several companies offer white glove delivery, either for an additional charge or with the cost of the mattress. If your mattress doesn’t come with this option, just be sure you have one or two people to help you move it into the room and set it up – especially if it is larger and heavier. When ordering your mattress you should not only look at the dimensions, but also its weight, to determine how much setup help you’ll need. 


Now that you know the important factors to consider in a mattress size, this can help make the ordering process smoother when you finally find that dream mattress. If you’re interested in viewing more beds, check out our list of the best mattresses, which includes a variety of options for all kinds of sleepers.

Jill Zwarensteyn

Jill Zwarensteyn


About Author

Jill Zwarensteyn is the Editor for Sleep Advisor and a Certified Sleep Science Coach. She is enthusiastic about providing helpful and engaging information on all things sleep and wellness.

Combination Sleeper