To Choose Mattress Sizes and Dimensions 2021
Comparing mattress sizes starts with looking at their dimensions in regards to length and width. Keep in mind that height/thickness varies depending on the manufacturer and model, so there is no universal thickness for each mattress size. Width and length measurements are standardized for each size and are listed in the table below.
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Answer 3 Easy Questions To Discover Your Perfect Mattress
What position do you sleep in?
· Side
You normally wake up sleeping on your side
· Back
You normally wake up sleeping on your back
· Stomach
You sleep lying flat on your stomach
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There are six different mattress sizes available from most manufacturers (in addition to crib/child size beds). For some, the choice can seem overwhelming. However, it’s easy to break the mattress sizes down into two categories: Beds suited for multiple people (couples, parents with children sharing the bed, etc.), and beds best fit for single sleepers. Here’s a more detailed breakdown of each mattress size:
How to Choose a Mattress Size
The tables in the mattress size guide above give you the basic differences between the various mattress sizes. Before choosing, however, there are a variety of factors that you should consider:
Sleeping Partners – Who do you share a bed with? This is the single largest consideration to keep in mind. Couples will likely want at least a queen, while couples sharing a bed with children will likely want a king. Even pets are a consideration; if you let your animals sleep at the foot of your bed, having a bed with ample legroom will greatly improve your comfort.
Your Height & Sleep Position – How tall are you and/or your partner? Typically those under 6 feet tall will have enough legroom on any mattress, while those over 6 feet tall will want to consider a bed with at least 80 inches of length (twin XL, queen, king, and California king). Your sleep position also factors into this consideration; back and stomach sleepers rest fully extended, and therefore need to consider legroom more than side sleepers.
Bedroom Dimensions – What room will you put your new mattress in, and how spacious is that room? To avoid a cramped feeling, we recommend leaving about 24 inches of space around each side of your bed. It’s best to measure out the approximate measurements of your new bed before purchasing it, to get an idea of how well it will fit in your bedroom.
Versatility – A new mattress can be a major purchase, so you’ll want to ensure that you get a versatile bed that will last a long time. This means thinking ahead about your mattress needs in the future. Buying a bed for a small child? Consider going one size up to future-proof the bed. Buying your first-ever bed as a single person? Consider going up a size to accommodate future partners and/or pets.
Cost & Value – A new, quality mattress can cost anywhere from $400 to over $3,000 – and the mattress size has a significant impact on the cost. While we don’t recommend cutting corners to save money on a new mattress, the overall expense of a new bed purchase is still a significant factor. Beyond the initial expense, it’s also wise to consider the cost of accessories. For less common sizes (California king and twin XL, mostly), accessories such as sheets, blankets, and bed frames will be more expensive than accessories for more popular sizes.
Mattress Sizes and Bed Dimensions Guide
Standard Mattress Sizes
Most mattress brands offer the following six sizes.
California King Size Bed Dimensions
72 inches by 84 inches
Minimum recommended room size: 12 feet by 12 feet
The California king size is the one of the longest bed sizes available (in terms of standard mattress sizes). It is 4 inches longer than the king size but is also 4 inches narrower. So technically what you gain in length, you lose in width in a California king bed— but the extra length makes it suitable for tall sleepers. California king beds can accommodate two sleepers comfortably and sometimes an extra sleeper as well, like parents co-sleeping with their child. This makes it a good choice for families.
The California king mattress may also come with the split option. In this style, the California king mattress is split into two equal parts, to provide for partners with different mattress preferences and work with adjustable beds.
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King Size Bed Dimensions
76 inches by 80 inches
Minimum recommended room size: 12 feet by 12 feet
Sleeping on a king size bed is sleeping in luxury. There is enough room for two sleepers to sprawl and sleep in their own space. It provides 4 inches of extra width than the California King, but it’s 4 inches smaller in length. King mattresses are the widest available standard size, making it a good choice for families— if parents want to co-sleep with their children, this size can accommodate them.
The king size also comes with a split option; this is really two Twin XL mattresses placed side-by-side. The split king option serves couples with different mattress preferences, so in one bed they can have two different mattresses to suit individual needs. This style is also a good fit for adjustable beds with split-side functionality.
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Queen Size Bed Dimensions
60 inches by 80 inches
Minimum recommended room size: 10 feet by 10 feet
A queen size mattress is popular for couples who don’t require too much space, or for a single adult preferring extra space to sprawl out while sleeping. The standard queen size is recommended for couples, so it can be a good bed for the master bedroom or guest room, comfortably accommodating extra sleepers in the house for a few nights. This is the most common standard size mattress which conveniently fits into almost any room and can accommodate more than one sleeper.
The queen size mattress also comes in a split queen option. In this style, the queen size is split into two equal halves to provide for couples who have different mattress preferences; so while sharing the bed, they can have a mattress suited to their personal preferences.
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Full Size Bed Dimensions
54 inches by 75 inches
Minimum recommended room size: 9 feet 6 inches by 10 feet 6 inches
A full-size mattress is best suited for a single sleeper. For couples, a full size mattress might not be a good choice for a comfortable sleep, but for an individual, this provides enough space to sleep comfortably and also fits into most rooms without making it look crowded. This size can also serve as a good option for a spare bed.
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Twin XL Size Bed Dimensions
38 inches by 80 inches
Minimum recommended room size: 9 feet 6 inches by 10 feet 6 inches
This size is 5 inches longer than the standard twin size, making it a preferred choice for taller individuals. The twin XL size is always a good option to accommodate extra guests on short notice. Since they don’t require much space and are less expensive than a queen or a full, it won’t be difficult to have one as a spare.
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Twin Size Bed Dimensions
38 inches by 75 inches
Minimum recommended room size: 7 feet by 10 feet
The smallest of all standard sizes, this is one of the most common beds available. The twin size mattress is good for children and teens alike, accommodating children in their growing stages.
However, a twin or single size mattress may not be a good fit for a full-grown adult. It is a good size to fit into smaller rooms, and ideal for bunk beds, too.
Please note: Our Amerisleep twin size mattresses measure 38 inches by 74 inches.
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Other Mattress Sizes
These sizes can be trickier to find, with many of them requiring you to order a custom mattress from a manufacturer.
Olympic Queen Mattress Dimensions
66 inches by 80 inches
Minimum recommended room size: 10 feet by 10 feet
The Olympic queen mattress is six inches wider than the standard queen size and provides enough room for a couple to sleep comfortably, but is not considered to be a “standard size.” Even when found, it’s an ordeal to find bedding accessories like sheets to match this size.
The benefit of an Olympic queen size is that it provides a little extra space than the queen size, while not being as big as a king. If your room is not big enough to accommodate a king, but you need more space for sleepers, then this Olympic queen size fits the bill. The Olympic queen size is meant for RVs and camper trailers and are more commonly seen inside mobile homes.
Full XL Size Bed Dimensions
54 inches by 80 inches
Minimum recommended room size: 9 feet 6 inches by 10 feet 6 inches
The full XL size has an extra 5 inches in length than a standard full. The extra legroom makes it a good fit for taller individuals sleeping by themselves. It can also be a good choice for a spare bed in your guest room, although some hosts prefer to offer a standard queen size mattress to accommodate couples.
Small Single Size Bed Dimensions
30 inches by 75 inches
Minimum recommended room size: 7 feet by 10 feet
Single mattresses and twin mattresses have the same dimensions, so these terms are often used interchangeably. However, the “twin” size is much more common nowadays, so if you have your eye on a single bed, a twin is just what you need.
Crib Size Bed Dimensions
27.25 inches by 51 inches
A crib size mattress is approximately 6 feet by 4 feet and only meant to fit inside a crib. The standard crib mattress size is regulated by the federal government for safety reasons, so it’s pretty easy to find crib size sheets that fit your mattress, as long as the one you choose is up to the current standards.
A crib size mattress should not be more than 6 inches thick. Ideally a crib size mattress should also offer a firm feel to support an infant’s body.
Other Mattress Size Factors that Influence Your Decision
Buying a mattress is a long-term investment in your health, and there are a number of things to think about during your search for the best mattress. Almost all mattress types (memory foam, latex, innerspring, and hybrids) are available in all standard sizes, but factors like the size of your bedroom also have to be considered while deciding on the size of your mattress.
Who’s Using the Mattress
This is one of the most critical factors to be considered while choosing the perfect mattress size. If you are an individual sleeper who does not share a bed with anyone, you can eliminate king and California king mattresses from your list— queen, full, or full XL beds would likely be the most fitting. We recommend queen and full XL mattresses to those who prefer some space to sprawl, and full and twin XL options to sleepers who need to save space.
However, if you plan on sharing your mattress with a partner or child, you’ll want to choose a queen, king, or California king. If you and your partner like to co-sleep with your children, a king or California king would be better accommodating.
Size of the Room
Keep in mind that your bedroom does not comprise just your bed. You need to leave space for movement and other comfortable furniture. The bedroom is your relaxing space, where you crawl into at the end of the day to rest and rejuvenate yourself. An overcrowded space may cause stress and make sleep more difficult. So a huge bed in a tiny room is not an ideal recommendation.
Location of the Bedroom
Maneuvering a king or California king size mattress may be difficult for some, so when buying a new bed be mindful of the size. If your bedroom is not on the first floor, consider the width of the stairways and how challenging it might be to get the mattress from one floor to another. Bed in a box mattresses are a solution to this once-common problem, but some beds can still be difficult to maneuver.
Budget
Budget is another important criterion because it determines available options. Once you have gone through all the other factors, it is time to step back and set a realistic budget for yourself. Look at materials, mattress brands, and read mattress reviews to determine the best choice.
Mattress Sizes FAQs
Is the California king bigger than the king?
They’re similar in size, but the California king is 4 inches longer than the standard king while the king is 4 inches wider than the California king.
Are there any more sizes of mattresses?
There are some oversized beds like the Alaskan king, Texas king, and Wyoming king, but they are way larger than the standard king and California king and are not easily found on the market.
What is the difference between a twin and a single mattress?
The dimensions; a single mattress is slightly smaller than a twin and best suited for toddlers. A twin size mattress will work with a toddler or a child transitioning out of a crib, but it will also grow with them as they get older. Twin size beds are even suitable for teenagers.
Is a full size mattress big enough for 2 people?
It depends on the size of the couple and their sleeping preferences. If you need more room to spread out or if you move around a lot while you sleep, a full size bed may be too small. If one or both of you are taller or wider than average, a full size mattress probably won’t offer enough space.
Are full size mattresses the same as double beds?
Yes, full size and double mattresses are the same. Both mattresses are 54 by 75 inches. The name “double” comes from the idea that a full size mattress is twice the size of a twin, but it’s actually 16 inches wider and 1 inch longer.
What size mattress do two side-by-side twin beds make?
Contrary to popular belief, two twin size mattresses side-by-side do not equal a king. However, two twin XL mattresses are equal to a king size bed. Two twin size mattresses are just as wide as a king, but not as long (they are 5 inches shorter).
What’s the largest mattress size?
The largest mattress size is an Alaskan king, which is 9 feet by 9 feet. To put that into perspective, a standard king size bed is closer to 6 feet by 7 feet.
What’s the most popular mattress size?
The most popular mattress size today is the queen. It’s large enough for most couples but fits into an average-sized bedroom. It’s also a nice option for single folks who need more surface area than a twin size mattress can provide.
Mattress Sizes and Bed Dimensions Guide
Mattress Sizes and Dimensions:
Which Bed Size Is Right
For You?Mattress Sizes and Dimensions:
Which Bed Size Is Right
For You?Mattress Dimensions:
Which Bed Size Is Right
For You?
Twin: 38” x 75” | 96.5 X 190.5cm
Twin XL: 38” x 80” | 96.5 X 203cm
Full: 53” x 75” | 134.5 X 190.5cm
Queen: 60” x 80” | 152.5 X 203cm
King: 76” x 80” | 193 X 203cm
California King: 72” x 84” | 183 X 213cm
Beyond personal preference, there are a number of factors to consider before picking a mattress size. You’ll want to think about the size of your bedroom, who you’ll be sharing your bed with, and available space.
In this guide, we illustrate the dimensions of all six standard mattress sizes to help you choose the best one for your needs. We also answer some commonly asked questions when it comes to bed sizes and choosing a mattress.
Twin
Twin bed dimensions: 38” x 75”
Best for: kids, bunk beds or single sleepers.
Room size: The minimum room size for a twin bed to fit naturally is 7 x 9 feet. An 8 x 10 square foot room may be required for the bed to fit with other furniture, such as a desk or dresser.
A twin mattress is the smallest bed on the market at 38 inches wide and 75 inches long. Its compact footprint makes it ideal for single sleepers — either children or adults with small spaces like a studio apartment.
Twin XL
Twin XL bed dimensions: 38” x 80”
Best for: taller teenagers, single adults or anyone with limited space.
Room size: The minimum room size for a twin XL bed to fit naturally is 8 x 10 feet. Twin XL beds can also work well in narrow rooms that are at least 7 feet wide.
The twin’s slightly longer cousin, the twin XL mattress, is the most popular size for college dorm rooms. It measures five inches longer than a twin, at 38 inches wide and 80 inches long. In addition to students, a twin XL mattress is a good solution for taller teenagers and individual adults with limited space. These beds can also be put together if you’re choosing a split king adjustable base for full body adjustability!
Full
Full size bed dimensions: 53” x 75”
Best for: young adults, couples who like to cuddle or guest rooms.
Room size: The minimum room size for a full bed to fit comfortably is 10 x 11 feet.
The full mattress is a good starter mattress for young adults or recent grads living on their own for the first time. Sometimes called a double, the full is 16 inches wider than a twin at 53 inches wide and 75 inches long. A full is not recommended for couples who like to share the bed with pets or their children, but it’s a smart choice for guest rooms.
Queen
Queen size mattress dimensions: 60” x 80”
Best for: couples or adults who like to sprawl out.
Room size: The queen mattress fits best in a master bedroom that is at least 10 x 10 feet.
The most popular mattress size on the market is the queen mattress, which is traditionally used in a master bedroom. At 60 inches wide and 80 inches long, the queen offers plenty of space for couples or individuals who like having extra room to move around in bed.
King
King size bed dimensions: 76” x 80”
Best for: couples who enjoy their space or share a bed with children.
Room size: A king mattress fits best in a spacious master bedroom, preferably at least 12 x 12 feet.
At 76 inches wide and 80 inches long, the king mattressis large enough to accommodate couples who share the bed with their children or a sizable pet (think: a Great Dane). A king bed can be made of two twin beds pushed together, which is referred to as a split king. King beds are large enough that both sleepers can sprawl out with room to spare.
California King
California king bed dimensions: 72” x 84”
Best for: couples with kids or pets who want a luxurious amount of space.
Room size: A California king mattress fits best in a large master bedroom of at least 12 x 12 feet.
The longest mattress on the market, the California king mattress is a whopping 72 inches wide and 84 inches long. Its generous length makes it ideal for taller individuals, especially people more than six feet tall. Of course, people of average height might also benefit from a California king depending on how many people and pets are sharing the bed.
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Which Bed Size Is The Best For Me?
If it’s time for a new mattress, you may be wondering which size is right for you. There are many things to consider, like who will be sleeping in the bed, how much space you will need, how much room is in your bedroom, and any specific health or sleep issues you might face.
Buying a new mattress is not a one-size-fits-all situation, so it’s essential to evaluate your individual needs. If you have a history of back pain or sleep problems, you may want a free trial period to help you make sure you’re comfortable with your new mattress.
Here are some other major factors you will want to consider when choosing a mattress.
Who Will Sleep In the Bed
Will you be sharing the bed with a partner? Do your children or dogs typically sleep with you? These are questions to ask yourself before deciding on mattress size. Typically twin, twin XL, and full mattresses are meant for one person. The queen, king, and California king beds are big enough for two sleepers.
If you are going to sleep with another person, consider how close you like to sleep and your usual sleeping positions. If you both like to stretch out when sleeping, the extra room afforded by a king or California king will be appreciated.
Your Room Size
The amount of space available to you should also be considered. A larger mattress will take up more space in your bedroom, so you will need to plan accordingly.
Here are the mattress sizes in square inches and square feet. Ensure there is plenty of space for the mattress in your room.
Twin: 2,925 sq. in./20.3 sq. ft.
Twin XL: 3,120 sq. in./21.7 sq. ft.
Full: 4,050 sq. in./28.1 sq. ft.
Queen: 4,800 sq. in./33.3 sq. ft.
King: 6,080 sq. in./42.2 sq. ft.
California King: 6,048 sq. in./42 sq. ft.
Your Body Size
You should take your height and width into consideration when choosing a mattress. A typical twin mattress is 75 inches long, while a twin XL is 80 inches long. If an individual is taller than six feet two inches, a twin mattress is probably not for them. Instead, it’s best to go with the XL, full, queen, or king bed, all of which can accommodate someone who is up to 6 feet 7 inches.
Those that are taller than 7 feet should opt for a California king bed. For those who want more space on either side of their body, a full, queen, or king bed will be the most comfortable.
Your Budget
The amount of money you are willing to spend on a mattress can also help you choose the right size. A king will cost more than a queen, and a queen more than a full, etc. Buying a mattress that meets both your size needs and your financial needs is key.
To learn more about in-depth comparisons between mattress sizes, take a look at our following articles:
Frequently Asked Questions
Assessing your options when it comes to choosing a mattress can be confusing, especially for those who don’t know the lingo. To help you with your search, here are some questions we hear frequently from our customers.
Mattress Dimensions
FAQs
A single mattress and a twin mattress are one and the same — both have the dimensions of 38 inches by 75 inches. These, along with the twin XL (which is a little longer), are designed to fit one person.
The term “twin” came about because these mattresses were often placed two to a room, either in children’s rooms, hotels, or other rooms that are meant to be shared by more than one person.
A twin, also known as a single mattress, is the smallest size available on the market today. Casper twin mattresses are 38 inches by 75 inches and are the perfect size for a child or short single sleeper. Single sleepers that need a longer bed can try a twin XL, which is 80 inches long.
Although a twin XL is 15 inches narrower than a full, it’s 5 inches longer. Twin XL beds usually can’t comfortably accommodate more than one person, but they are an ideal choice for a single sleeper that’s too tall for a traditional size bed. Twin XL beds are great for small, narrow bedrooms where there’s not a lot of floor space, and are often the bed of choice for college dorm rooms and apartments.
The dimensions for a Casper double size mattress and a full mattress are 53 inches by 75 inches. In this case, both names represent the same kind of mattress. This bed is on the smaller side, but still able to fit two people if needed.
The full-sized bed (also known as a double) can fit two people. In fact, full mattresses were the most common size used by couples in the 1960s. They are advantageous because they are able to fit into smaller rooms. However, many adults these days prefer a larger bed.
The full bed is 53 inches by 75 inches, leaving only 26.5 inches across for each person’s personal sleeping area. The slightly larger queen bed offers 30 inches of space per person, while a king offers 38 inches per person. Depending on you and your bed mate’s sizes and sleeping styles, you may consider a queen or a king rather than a full.
Full vs. queen size beds are some of the most common choices for adult bedrooms. While a full measures 53 inches by 75 inches, a queen measures 60 inches by 80 inches. Full beds are good for young adults, couples who cuddle in their sleep, and guest rooms, while queen beds are an ideal bed for people who like to sprawl out at night.
If you’re deciding between a king or California king, it all comes down to four inches. A king mattress is actually four inches wider than a California king, while a California king is four inches longer than a king at 72 inches by 84 inches.
The king-sized bed is the widest bed that Casper sells, measuring at 76 inches by 80 inches. Those looking for a longer bed can purchase the California king, which is slightly longer and narrower, measuring 72 inches by 84 inches. Both beds should be large enough to fit two adults, although those who are taller may prefer a California king.