How Long Is King Size Mattress

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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 mattresscan 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 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 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

These are the mattresses specifically designed for cribs. It can also serve as toddler beds in most cases once your baby outgrows the cot. Typical measurements are30” width and 75” length.

Twin Bed Dimensions

Atypical 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 isideal for childrenwho 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

There are subcategories of double beds to consider as well. The Twin XL istypically 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.

Full Bed Dimensions

Full-size mattress measures54’ 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 (Double) XL

A XL option is54” x 80”giving you anextra 6 inchesof leg space. If you do not require extra width but want some more room for your legs this is a perfect option.

Queen Bed Dimensions

Queen size mattresses are60” 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 andmeasure 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.

King Bed Dimensions

A standardKing 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

TheCalifornia King mattress is 72” W x 84” Lmaking 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’.

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.

Frequently Asked Questions

Which size is best for me?

Bigger isn’t always better, but in most cases it can’t hurt. More space could mean fewer sleep interruptions, but if you always prefer to cuddle up rather than spread out, that extra space might not be worth it, especially if you’re on a tight budget.

In many cases, couples will opt for a bigger version of a cheap bed, but if you don’t need the extra space, that money could be better spent on features like cooling or motion isolation. For a better understanding of getting your money’s worth, take a look at our mattress budget guide .


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’replanning 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 –
  2. Reasons Why Your Bed Height Actually Matters –
  3. Complete Mattress Size Guide – by
  4. Illustrated Bed Dimensions Guide – by

Author: Sleep Advisor

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There’s no one-size-fits-all when it comes to better health and better rest, but no one has time to sleep, let alone figure out how to upgrade the sleep they’re getting.

From figuring out how to buy a mattress, suggesting ones that are good for different needs and body types, or breaking down the newest science behind technology and wellness breakthroughs, Sleep Advisor has you covered.

How Long Do Mattresses Last?

Mattresses aren’t exactly cheap, most people replace them very infrequently and consider buying a new one either a chore or a burden. It’s easy to delay or prolong this process simply by taking proper care of whichever type you own. As a general rule, most should be replaced within ten years for best results in sleep and health, however, the average life of a mattress can last beyond ten years or more if taken care of properly. While it is true that how long one lasts depends on different factors, you can easily increase its life expectancy by undertaking a small number of simple steps. Here is a look at a few of the factors that can decide how long should a mattress last, and possible ways to increase its lifespan:

Table of Contents

1. The Type

What type do you have? For instance, is it air, innerspring, memory foam or latex? Each one has its own life expectancy; air and innerspring being the shortest, memory foam being mid length, while latex types are known to last the longest.

  • Air mattresses will over time either develop leaks or generally become less effective at retaining air pressure. If they have a built-in pump that becomes faulty, this too can lead to premature replacement. Overall, the average air mattress life expectancy is placed at five years.
  • Spring mattresses are good for sharing couples who like a springy and bouncy surface, but unfortunately, due to the inner core being thin metal wire, this type does tend to sag and lose its support even if flipped and rotated regularly. Even ones which have been well cared for will most likely need replacing within 7-8 years.
  • Memory foam mattresses are less prone to sagging but not invincible. They too require rotating, and foam does eventually lose its support but after a long while. This type should be good for at least ten years if kept ventilated, clean, and rotated.
  • Latex mattresses are the creme de la creme and tick all the boxes for quality and longevity. The naturally hypoallergenic and anti-microbial properties add to the durable nature of latex rubber foam to combine a core which can last up to 15 years.

2. Regular Cleaning

Another important factor which determines mattress life expectancy is to do with cleaning.Howdo you clean it? Do you clean itregularly? Do you give it to aprofessionalcleaner? It’s essential that you clean your mattress regularly to prolong the life. If you do not, it won’t last long at all. This is due to the invisible bacteria, mildew, and mattress mold that can slowly eat away at the materials involved. Moreover, it may be better if you could have it cleaned professionally from time to time, as mattresses are home to bacteria and germs in plenty, which might not get adequately cleansed with household cleaning products and methods.

3. Amount of Use

As you can imagine, anything that is used more will last less. However, there are two things that need to be kept in mind. Whichever type you own, it wouldn’t last as long in cases of extreme use, for example sharing couples who use for 10+ hours per day, and secondly on the other hand, if it has been left unused and uncleaned for prolong periods of time. Mattresses that are moderately used, where people sleep on it for around 7-8 hours a day, and then cleaned regularly are the ones that have the longest life.

4. The Cleaning Products

The question of how long do mattresses last really is to do with many supporting factors, but quite often depends on the cleaning methods used to clean them. For instance, in case of blood stains, you might have to use hydrogen peroxide to get rid. Too much of this chemical (and other heavy duty stain removers) would lead to a reduction of mattress life as these are not made to withstand such chemical uses.

5. Proper Precautions

It is always nice to have kids around the house. However, if your kids want to use your bed as a trampoline, it seriously isn’t a good idea. You would rather have them play elsewhere since this can seriously damage your bed. Imagine you have an innerspring, the springs will become too soft and compressed in no time at all and will leave you with a creaky and sagging surface. Additionally, whether it’s latex or memory foam, soon there will be indentations which are beyond repair. To prolong its life, you can also rotate and flip it from time to time, but that’s only if it’s double-sided and permits you to do so. You could perform this every few months for the duration of its life, which will significantly improve how long a mattress can last.

When Do You Know You Cannot Use Your Mattress?

Usually, mattresses that are over seven years old do not provide the comfort and support you need on the bed. Once you see there are signs of the surface and support wearing out, or you’re feeling uncomfortable in the bed when you are sleeping on it, you would be better off changing it. Some of the common visible signs of wearing are sagging, holes and tearing. If you cannot get a full night’s sleep and feel that you’re having a better slumber elsewhere than your bed, you need to start looking for a replacement.

You might buy the most expensive mattress, but if you do not care for it properly, it might not even last ten years. On the other side, ones which are taken care of correctly are known to last more than 15 years.

King vs Twin XL Beds – Mattress Sizes

Fun fact: assembletwo Twin XL mattressesnext to one another and they have the identicaldimensions of a King bed. The Twin XL is thesame width as the Standard Twin, but the mattresses5″ of additional lengthmake it the length as a King. Read on for our complete comparison of Twin XL vs King mattress sizes.

The Basics

Standard (or Eastern) King:

Standard King
Width Per Person38"

Who is this bed size ideal for?

A King bed is typicallybest suited for couples. In fact, a King mattress is the equivalent of each individual sleeping in their own Twin XL bed (pushed together). The King bed offers each sleeper 8 additional inches of space compared to a Queen sized bed, which makes it ideal for Master Bedrooms, but potentially too large for some individuals.

Twin XL

Twin XL

Who is this bed size ideal for?

The Twin XL has the identical width as a Standard Twin, but it’s approximately5″ longer, making it the same length as a Queen or King. The Twin XL is a solid option forcollege dormitoriesor taller children who may have smaller rooms. Travelers will also see them in hostels where multiple beds are in one large room.

Other Size Options


The California (Western) Kingis decently popular because it’s narrower and longer than a traditional King size mattress, which can sometimes be a little too wide for a medium-sized bedroom.

CA King

The Split Kingis similar to a Standard King, but it’s 2” wider and split down the middle, allowing each individual sleeper to have their own designated section of the bed.

Split King
Width39" (each half)

A Standard Twinis also known as a Single bed, and Twin mattresses and beds are often the next steps for children who have outgrown their cribs. Twin mattresses are also a great option for smaller bedrooms like Guest Rooms, as well as bunk beds, which are traditionally manufactured in Twin size.


What Size Is Best?

Who will like the King mattress?

  • People upgrading their MasterBedroom,King sized bedstend to be the best fit for larger master bedrooms, where there is ample space not only for the new bed but for the additional pieces of furniture and accessories in the bedroom.
  • Individuals who like to stretch out,while it comes down to personal preference, manycouples opt for a King size bedover a Queen (or a Full for that matter). In a King-sized mattress, each person gets38″ of space on each side, which makes it comfortable forcouples to spread out, or for the youngest family member to hop in during the night.
  • Shoppers with a budget as massive as a King bed.Everything adds up when shopping for a new mattress.People who move from a Queen – or something smaller – to a new King bed, will probably need to purchase a sturdy, reliable bed and bed frame, as well as some comfortable King-sized sheets, and potentially some more pillows.

Who Will Like the Twin XL?

  • A young adult or childwill be well-suited for a Twin XL mattress. As mentioned earlier, Twin-sized beds are essentially thenext step up from a crib mattress. A Twin XL’s dimensions are 38″ x 80″ and could be a good fit for a child’s room, or even a teenager who could use the additional length.
  • People trying to save moneymight have room for a Full/Double bed but can’t afford the frame, mattress, and sheets. Shoppers who need a new mattress can consider a Twin XL. The bedwill definitely be more affordablesince it’s a smaller mattress. Saving on space also gives sleepers an extra 5″ in length, and many Back-To-School sales offer bedding bundles in Twin XL size.
  • For people who need a bed for a smallerroom,one Twin XL bed will lookvery small in a Master Bedroom(unless it’s a smaller bedroom). Instead, the the Twin XL is probably a good fit as a replacement for a crib in a nursery or a smaller room that maybe two people share – like a kid’s room.

Koksharov Dmitry/Shutterstock

Things To Consider

Here are some tips and things to think about before making a purchase.

  • Measure the space and leave room for movement.Shoppers who are thinking about making the jump from a crib to a Twin XL – or are ready to live large and get a King bed – make sureit fits it in your bedroom.Just know that it’s easy to get caught up in an impulsive shopping moment and end up with a bed that doesn’t exactly fit. An article from Th!ngz Contemporary Living says thatmost designers will recommend 30″ of space around your bedfor movement. That means that a King size will be best for a large Master bedroom.
  • Consider how you’ll get your bed into the room.While Twin XL beds and mattresses won’t be too difficult to get through doorways or upstairs, a King mattress may take some maneuvering (and another set of hands) to get into a bedroom.
  • Shop seasonally whenever possible.There are specific times during the year that mattresses andbeds will go on sale.For shoppers who are on a budget but want to upgrade to a bigger bed, it might be worth waiting to make a purchase during that time. Back-To-School is an excellent time to shop for Twin XL beds as they’re very common in college dorm rooms. For mattresses, Labor Day weekend is often a good time for sales.


There are a variety of reasons to go with either a Twin XL bed or a King bed. It’lldepend on sleep needs, room size and – of course – budget!One hack that might be worth investigating is seeing ifthe cost of two Twin XL beds is cheaper than a King bed.Sleepers can put two Twin XL mattresses on a King frame for a Split King mattress (always check dimensions first as some brands may change theirs).

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Bed Sizes and Mattress Dimensions

King, Queen, Double & Single Bed Size

Australian Bed and Mattress sizes

Bed TypeMetric Measurements (cm)Imperial Measurements
Single Bed size92 cm x 187 cm3’0" x 6’2" (36" x 74")
Single Extra Long size92 cm x 203 cm3’0" x 6’8" (36" x 80")
King Single size106 cm x 203 cm3’6" x 6’8" (42" x 80")
Double Size137 cm x 187 cm4’6" x 6’2" (54"x 74")
Queen Size153 cm x 203 cm5’0" x 6’8" (60"x 80")
King Size183 cm x 203 cm6’0" x 6’8" (72" x 80")
Super King Size203 cm x 203 cm6’8" x 6’8" (80" x 80")

US (North America) Bed & Mattress sizes

Bed TypeMetric Measurements (cm)Imperial Measurements
Single/Twin Bed size99 cm x 191 cm39" x 75"
Twin XL size99 cm x 203 cm39" x 80"
Double size137 cm x 191 cm54" x 75"
Queen Size152 cm x 203 cm60"x 80"
King Size198 cm x 203 cm76"x 80"
Super King Size183 cm x 213 cm72" x 84"

UK Bed & Mattress Sizes

Bed TypeMetric Measurements (cm)Imperial Measurements
Small Single Bed size75 cm x 180 cm30" x 70"
Single Bed size90 cm x 190 cm36" x 75"
Small Double size120 cm x 190 cm48" x 75"
Double Size135 cm x 190 cm54"x 75"
King Size150 cm x 200 cm60"x 80"
Super King Size180 cm x 200 cm72" x 80"

European Bed & Mattress sizes

Bed TypeMetric Measurements (cm)Imperial Measurements
Small/Twin Bed size90 cm x 200 cm35" x 79"
Single Large Bed size100 cm x 200 cm39" x 79"
Small Double size122 cm x 198 cm48" x 78"
Double Size137 cm x 191 cm54"x 75"
King Size152 cm x 198 cm60"x 78"
Super King Size183 cm x 198 cm72" x 78"

International Mattress Sizes / Bed Sizes

This chart lists international mattress size measurements, including theUSA, UK, Europe & Asia.

US/CanadaUKEuropeAsia (Thailand)
Twin/Single size39" x 75"90cm(W) x 190cm(L) – 3′ x 6′ 3"36" x 75"42" x 78" x 22"
Double size54" × 75"135cm(W) x 190cm(L) – 4′ 6" x 6′ 3"54" x 75"48" x 78" x 22"
Queen size60" x 80"NANA60" x 78" x 22"
Olympic Queen size66" x 80"NANANA
California Queen size60" x 84"NANANA
King size76" x 80"150cm(W) x 200cm(L) – 5′ x 6′ 6"60" x 78"72" × 78" × 22"
California King size72" x 84"NANANA
Super King sizeNA180cm(W) x 200cm(L) – 6′ x 6′ 6"72" x 78"NA
Twin XL size39" x 80"NA39" x 79"NA
Twin XXL size39" x 85"NANANA
Twin XL size39" x 80"NANANA
Three Quarter size39" x 85"120cm(W) x 190cm(L) – 4′ x 6′ 3"NANA
Small Single size39" x 80"75cm(W) x 190cm(L) – 2′ 6" x 6′ 3"NANA

Australia has seven commonly available mattress sizes. Single bed, Long Single, King Single, Double size, Queen size, King size and Super King size.

Single: Ideal for children and teens.

Single XL:Ideal for one person when space is at a premium. Also known as Long Single and Single Extra Long.

King Single:Ideal for growing children, teens and mature single sleepers.

Double:Cosy for two sleepers, roomy for one.

Queen:Ideal for couples and the bed size most commonly sold.King: Becoming more and more popular because of its generous sleep area.

Super King:Not very common as a mattress size, but more popular for bed linen. Created because people often buy a doona and doona cover one size bigger that their bed size. (For example – Super King linen on a King size bed).

Mattress Sizes Tips

Read these 7 Mattress Sizes Tips tips to make your life smarter, better, faster and wiser. Each tip is approved by our Editors and created by expert writers so great we call them Gurus. LifeTips is the place to go when you need to know about Mattress tips and hundreds of other topics.

King size mattresses

How big is a king size mattress? Well, there are several sub-varieties. An ordinary King mattress is 76" wide x 80" long. There is also the "California King", which is slightly narrower and longer at 72" x 84". Finally, you also have the "King Split", which is 78" x 80", and happens to be the same as if you place two Twin Extra Long mattresses together side by side.

How big is a king size mattress?

King size mattresses are not all the same dimensions. Like other kinds of mattress sizes, a “king” will vary. The standard king size measures 76” x 80”, but a king size mattress in the UK is roughly the same size as an American queen size mattress. Then there is the California King mattress which is 72” x 84”. In the UK there is also a “super king size” mattress, which measures about 72” x 78”.

Getting the mattress size right

When you are looking for particular mattress sizes, don’t forget the vertical measurements! Mattress thickness can vary dramatically from as little as six inches to 22 inches. If you decide to use a box spring or foundation, that will increase it still further. If you are buying a mattress for an existing bed frame, don’t forget to measure the distance from where the bottom of the place where the mattress will rest up to the bottom of the headboard. Otherwise your headboard will either be a nuisance or invisible.

Get the right mattress size

If you need to buy a mattress to fit in a particular bed frame or to go in a part of a room where space is limited, don’t be satisfied that by knowing the type, i.e., “queen size mattress”, “full size mattress”, king mattress”, etc. you know the mattress size. Take your tape measure and get the size in inches and make sure it will fit.

What is a full size mattress?

If you’ve ever heard someone refer to a double mattress size or a full size mattress, they are talking about the same mattress size. You may also have heard that a double mattress is equivalent to putting two twin size mattresses side by side. The length is about the same, but the width of two twins together is about three inches wider than a standard full size mattress.

How mattress sizes add up

If you are buying a mattress in a specific size, don’t assume that if you know it’s a “twin” that you know the mattress size. Mattress sizes can differ even for a particular class of mattress. This is especially true for mattresses from other parts of the world. A “twin” size mattress from Europe will be about three inches narrower than a US twin, and an Asian twin will be about three inches wider and longer.

How big is a queen size mattress?

“Queen size mattress” actually includes at least three different sub-types of mattress sizes. An “ordinary” queen measures 68” x 80”. An olympic queen is longer at 66” x 80”. Finally the California queen is even longer at 60” x 84”. Ironically, this queen size is actually longer than a king size mattress, or even a “super king” mattress.

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