The Ultimate Mattress Size Chart and Bed Dimensions Guide

Intuitively, the different sizes of beds seem easy enough to understand, right? The truth is, choosing the right size of your mattress can be more complicated than you may think. Does it fit nicely in my bedroom? Is there enough leg room? And many other.

To help you make the best decisions when selecting a mattress, 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.

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Common Bed Size Dimensions Comparison

TypeSize (Inches)Suitable For
Small Single or Cot 30 x 75Babies and toddlers
Twin38 x 75Kids that have outgrown their cribs and single adults living in smaller apartments. It's also great for daybed or bunk bed.
Twin XL38 x 80Kids and taller adults and those who want to use an adjustable bed frame
Full54 x 75Good for a single sleeper or someone with children or pets and couples that do not require a lot of leg room.
Full XL54 x 80More than enough for single sleeper and for couples that need more leg room 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 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.

Small Single Bed (Cot) Dimensions

Illustrated image of Small Single Cot Dimensions

Twin Bed Dimensions

Illustrated image of Twin size bed dimensions in inches

A typical single, twin or bunk mattresses are 38” width x 75” length. You’d be hard-pressed to find a bed that is any smaller than this one, other than that of a toddler bed or crib.

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

Additionally, for those who sleep in cramped quarters, who have small rooms or who share a room with a sibling or roommate, Twin beds are an ideal choice. Day beds, bunk beds, dorm room beds or those found in the guest room often use this type.

Recommended reading:

What is important to note about a Twin bed versus a larger toddler bed, is that comfort is taken more into account. It’s common that, once you reach the Twin size, more quality materials are used, and more engineering centered on comfort takes place. This is because, the older we get, the more we consider comfortable sleeping to be a necessity.

Twin XL Bed Dimensions Illustration

Twin XL

There are subcategories of double beds to consider as well. The Twin XL is typically 80” L while still maintaining the 38” W. If you’re an adult looking for a bed that saves space and still is a comfortable choice, an XL Twin may be perfect for you.

Can I use Twin XL mattress on a King Size Bed Frame?

Yes, you can use two double/twin XL beds in a king frame. If you are in a relationship where one partner requires a different firmness than the other, usually end up being big fans of this setup. This is because Two XL beds can fit snugly alongside each other within a King sized bed frame.

This is good to know for partners who are tired of the fluffiness or firmness of their spouse’s mattress.

Recommended Read: Our Top 5 Mattresses For Couples

Full Bed Dimensions

Illustration of full size bed dimensions in inches

Full-size mattress measures 54’ width x 75” in length, and these are also commonly referred to as “standard double.” Sufficient for adults that 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 exceedingly tight. Likewise, if you have a dog, cat, or you have a child that sleeps next to you, you may want to consider a wider option.

full xl dimensions illustration

Full (Double) XL

A XL option is 54” x 80” 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.

For more information, read our comparison between Full and Queen Bed.

Queen Bed Dimensions

Image showing a queen size bed dimensions in inches

Queen size mattresses are 60” width x 80” length. Ideal for almost anyone, in that it’s long enough and wide enough to suit most any sleeper. For those who sleep with their spouse, child or pet, it might be perfect for you.

When thinking about these larger types, it becomes necessary to consider the living space. These take up much more room than the Twin or the Full, and thus, the ability to freely move around the bedroom may become restricted.

If you have a larger bedroom, then this won’t be a factor for you.

Olympic Queen

These are slightly wider and measure at 66”W x 80” L.  Olympic queen is perfect for taller individuals, but you don’t want to upgrade all the way to King, but you could use some more width.

Read how Queen compares to King bed size.

King Bed Dimensions

King Bed Dimensions Illustration

A standard King size mattress is 76” in width and 80” in length. It’s recommended that you do not opt for this option unless your room is at least 12×12. This is a perfect option for couples who sleep with their kids or pets and want more sleeping room for themselves.

If you want to compare this to other options, King is same as 2x Twin XL.

A nice fact is that box springs are split for this type, and it makes it easier to carry around and maneuver.

California King Bed Dimensions

Illustrated image of California King measurements

The California King mattress is 72” W x 84” L making it one of the biggest options on the market. It’s perfect for active sleepers, tall people and couples with kids or pets. Cal King is 4” longer but 4” narrower when compared to a standard King.

It is recommended that you have a large room of at least 12’x12’.

Read the full King vs. Cali King mattress size comparison article.

Bedroom Size Requirements

Ok, so you have decided that you need a new bed. But, can you actually put it in your room and still be able to open the door and walk around it?

Let’s take a look at the following illustrations showing how certain mattress sizes will fit in your room.

An illustration showing a King type bed inside a 12x12 feet bedroom
King type bed inside a 12x12 feet bedroom
An illustration showing a 12x12 feet room with a queen type mattress
How a Queen type bed looks in a 12x12 feet room.
10x10 foot room with a queen bed inside it - scaled model
How a queen bed fits in a 10x10 foot bedroom
How a King sized bed fits in 10x10 foot bedroom
How a King sized bed fits in a 10x10 foot bedroom

Conclusion


When trying to find the right mattress size to fit the needs of you or your family, these are a few things to have in mind.

  • First, if you’re planning on upgrading, make sure you know the dimensions of your current bed. You wouldn’t want to shop for a larger option and accidentally choose the same type.
  • Second, if you’re moving, don’t forget to measure the room that you’ll be sleeping in. It is awful to have a mattress that is too big for space. You’ll have issues getting around the room, and your space won’t be as aesthetically pleasing.
  • Third, who will be sleeping in it? If it's just you, you are good to go with a Double. But, if you have a spouse, kids or pets you might want to opt for a larger option such as Queen. King is the ultimate comfort size if your room can accommodate it.

Now that you know more about the sizes you can check out our other guides, researched for specific needs and types.

Hope this guide was helpful and that it cleared any doubts.

Please let us know if you have any questions in the comment section. 


More from The Sleep Advisor:

More Reading:

  1. Bed size may affect good night's sleep – netdoctor.co.uk
  2. Reasons Why Your Bed Height Actually Matters – dreams.co.uk
  3. Complete Mattress Size Guide – by Nectarsleep.com
  4. Illustrated Bed Dimensions Guide – by Dreamcloudsleep.com

Author: Mark Reddick

When I’m not learning about sleep, you can find me hanging out with my wife and close friends.

I absolutely love entrepreneurship and learning how to improve yourself daily. We only get one life, and I want to make it the best one possible.

I hope that everyone that finds our site takes a new approach to sleep. The world needs to stop thinking about it as something “we just do,” but rather something that allows us “to do every day.”

12 Comments
  1. Reply
    geodepe September 24, 2018 at 5:04 pm

    Is there a standard thickness for a mattress?

    • Reply
      Sarah Cummings September 24, 2018 at 9:11 pm

      Hey! Thanks for the note. The short answer is no. Mattresses come in all kinds of thicknesses in a range between 6 inches to as many as 17-18 and perhaps beyond. The most popular measurement tends to be 10 inches thick, but this is changing all the time. I hope this helps!

  2. Reply
    SAM October 2, 2018 at 6:18 am

    THANK YOU VERY MUCH FOR YOUR GREAT INFORMATION

  3. Reply
    Jamy November 20, 2018 at 10:24 am

    Hi Mark!

    What size would you recommend for someone who’s 6 feet tall with a partner of 5 feet 4?

    Thanks!
    jamy

    • Reply
      Sarah Cummings November 26, 2018 at 5:38 pm

      Hi Jamy, Lots depends on your home and the space you have. More space may be better than not enough, but it all depends on how large your bedroom is. Thanks for reaching out!

  4. Reply
    Just a Helpful Person November 24, 2018 at 2:29 am

    I love the information including the pictures. Just a note we have a Cal King and husband and I are on the larger size. It fits both of us one Mancoon cat, a small dog and another cat. We never felt crowded. Just keep in mind that it is hard to find nice bed sets for those thinking about this bed option

  5. Reply
    Marla Hoffman January 1, 2019 at 1:29 pm

    What size mattress is used for a daybed? I have a twin om mine and it appears to be too narrow. Thank you.

    • Reply
      Sarah Cummings January 3, 2019 at 12:17 am

      Marla, it really depends on the daybed. Check with your manufacturer.

  6. Reply
    Susan January 2, 2019 at 7:05 pm

    What are the measurements of a twin sheet? Thanks.

    • Reply
      Sarah Cummings January 3, 2019 at 12:19 am

      standard twin size should be 38 x 75, but some can vary slightly.

  7. Reply
    Antonio Maynegra February 17, 2019 at 7:28 am

    I am looking to buy a 4″ thick 30″x75″ small single hard foam mattress .Where can I buy it
    from either in person if location is in the Miami area or via internet.Also maybe get a phone
    number to call and find out if they have covers for the mattress with zipper so it can be washed
    It is for a sofa that also has 2 boulters for the back when used for sitting.Waiting for your answer.

    • Reply
      Sarah Cummings February 19, 2019 at 3:13 pm

      Sorry, we do not have a lot of information on mattresses that are that thin. Have you tried Amazon?

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