Mattress Sizes Chart and Bed Dimensions Guide

By McKenzie Hyde Certified Sleep Coach

Last Updated On October 4th, 2023
Mattress Sizes Chart and Bed Dimensions Guide

Shop Amerisleep by Mattress Size

Mattress Sizes and Dimensions Chart

Mattress SizeDimensions in InchesDimensions in Centimeters
California King72" X 84"183 X 213.5cm
King76" X 80"193 X 203.5cm
Olympic Queen66" X 80"167 X 203.5cm
Queen60" X 80"152 X 203.5cm
Full XL54" X 80"137 X 203.5cm
Full54" X 75"134.5 X 190.5cm
Twin XL38" X 80"96.5 X 203.5cm
Twin38" X 75"96.5 X 188.0cm
Small Single30" X 75"76.2 X 190.5cm
Crib27.25" X 51"69.2 X 129.5cm

Apart from the texture and feel, there is another very important facet of your mattress which influences your choice—the size. Getting the right size mattress is one of the crucial determinants leading towards the ultimate goal of a good night’s sleep.

When looking for a new mattress, choosing the right size from a plethora of options can be difficult, especially when there are sub-categories in certain segments. With very little difference in dimensions between certain sizes, getting the right fit for yourself can be a daunting task.

Save $450 On Any Mattress

Plus free shipping

Get $450 OFF Mattresses

Want to discover the best mattress of 2023? Read here.

The size of your bedroom and your budget are key factors in your decision-making process when looking for the ideal bed size. In this mattress sizes and dimensions guide, we will discuss the different mattress sizes available and the recommended room size for each of them to help you choose the most-fitting mattress size. For most homes though, a Queen size mattress (60” x 80”) is the most popular option but plenty of people opt to go smaller with Full size mattresses (54” x 75”) or larger Kings (76” x 80”).

Find the best mattress for your unique needs!

Claim deal now

Standard Mattress Sizes

Most mattress brands offer the following six sizes.

California King Size Bed Dimensions

California King Size Mattress Dimensions72 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.

Shop California King

King Size Bed Dimensions

King Size Mattress 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.

Shop King

Queen Size Bed Dimensions

Queen Size Mattress 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.

Shop Queen

Full Size Bed Dimensions

Full Size Mattress 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.

Shop Full

Twin XL Size Bed Dimensions

Twin XL Size Mattress Dimensions38 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.

Shop Twin XL

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. 

Shop Twin

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

Olympic Queen Size 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

Full XL Size Mattress 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 crib mattress 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.

Key Takeaways

  • Standard and Non-Standard Mattress Sizes: There are six common standard mattress sizes available, ranging from the largest California King to the smallest Crib size.  There are also less-common, nonstandard variations and oversized mattresses. The choice of size should depend on your space, sleeping preferences, and the number of sleepers.
  • California King vs. King Size: California King beds are longer but narrower than King size beds, making them suitable for tall individuals. Both sizes can accommodate couples comfortably, and they also come with a split option for partners with different mattress preferences.
  • Queen, Full, Twin XL, and Twin Sizes: Queen size mattresses are popular for couples, while Full size is suitable for a single sleeper. Twin XL is a longer option preferred by taller individuals, and Twin size is common for children and teens. Each of these sizes has its own advantages and can fit various room sizes and sleeping needs.

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.

Bed frames are also an essential component when purchasing a mattress, as they provide crucial support and stability. 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 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.

Key Takeaways

  • Factors to Consider for Mattress Size: When selecting the perfect mattress size, consider factors such as the number of individuals using the mattress, the size of your bedroom, the location of the bedroom (including stairways and maneuverability), and your budget. These factors will help you make an informed decision about the mattress size that best fits your requirements.
  • Choosing the Right Size for Sleeping Arrangements: If you’re an individual sleeper, focus on queen, full, or full XL mattress options for comfortable sleeping or twin beds if you’re on a tight budget. Couples or families who co-sleep with children may find queen, king, or California king sizes more accommodating. Consider your specific sleeping arrangements and needs.
  • Think Long-Term Investment: Buying a mattress is a long-term investment in your health and well-being, so it’s important to carefully consider your options. Take your time to choose the right mattress size and type that suits your needs.

Best Mattress Sizes for Single Sleepers

Twin, twin XL, full, and queen sizes are more suitable for individuals who sleep alone. While a full mattress could temporarily accommodate a couple, twin XL and twin sizes are strictly designed for single sleepers. Although queen mattresses are commonly chosen by couples, they are also a popular choice among those who sleep solo.

 TwinTwin XLFullQueen
Mattress Dimensions38 inches wide and 74 inches long38 inches wide and 80 inches long54 inches wide and 75 inches long60 inches wide and 80 inches long
Surface Area2,812 square inches3,040 square inches4,050 square inches4,800 square inches
AdvantagesIdeal for children:Perfectly sized for children and teens, providing adequate space for their needs.
Space-efficient: Fits well in small bedrooms, allowing for additional furniture or play areas.
Cost-effective: Typically the most affordable option, making it budget-friendly.
Ideal for tall single adults: Provides extra legroom for individuals over 6 feet tall, enhancing comfort during sleep.
Good for shared spaces: Fits well in dorm rooms or small apartments where space is limited.
Easier to move: Due to its smaller size and lighter weight compared to larger mattresses, a twin XL is easier to transport and maneuver.
Versatile for guest rooms: Full-size mattresses can accommodate couples when needed in guest rooms, providing flexibility.
Comfortable for single adults: Offers more space for single sleepers to stretch out comfortably compared to a twin.
Can accommodate another : If you want to make sure you have space for overnight guests while sleeping alone, a queen is an excellent option.
Not too expansive: A queen mattress can fit in most bedrooms quite comfortably.
DisadvantagesNot suited for adults: It can be too short and narrow for most adults, leading to discomfort during sleep.
Limited guest use: Not ideal for accommodating guests, as it's usually too small for most adults or couples.
Outgrown quickly: Children and teens may outgrow a twin mattress as they get older, requiring an upgrade.
Only for solo sleepers: Too narrow for couples to sleep comfortably.
Bedding costs: Bedding for twin XL mattresses may be slightly more expensive and less widely available.
Limited space for couples: While it can work for couples occasionally, it's still smaller than a queen or king, leading to less sleeping space.
Not highest value: Prices are comparable to a queen without the same space.
Less room for activities: If used in a child or teen's room, there's limited floor space for play and activities.
More expensive: While still a budget-friendly choice for many, a queen mattress costs more than smaller sizes.
Best ForYounger children or teenagers, and single adults under 6 feet tallOlder teens and single adults over 6 feet tallSingle adults under 6 feet tall who like to sprawl and stretch outSingle adults who want to be able to accommodate future partners

Key Takeaways

  • Ideal Mattress Sizes: For single sleepers, mattress options like Twin, Twin XL, Full, and Queen are suitable choices, depending on your specific needs and room size.
  • Advantages of Each Size: Twins are perfect for children and teens, space-efficient, and cost-effective. Twin XL beds are great for tall individuals, fit well in shared spaces, and are easier to move. A full is versatile for guest rooms and offers more space for single adults. Lastly, a queen can accommodate another person when needed, fits most bedrooms comfortably.
  • Considerations: Twin and twin XL mattresses may not be comfortable for most adults. A full mattress may limit space for activities in a child or teen’s room. A queen mattress is a versatile choice but costs more than smaller sizes.

Best Mattress Sizes for Couples

Queen and king mattresses are the beds of choice to accommodate two partners. However, the exact best fit will depend on you and your partner’s needs. Overall, consider your budget, personal space preferences, and available room size.

 QueenKingCalifornia KingSplit King
Mattress Dimensions60 inches wide and 80 inches long76 inches wide and 80 inches long72 inches wide and 84 inches longEach side is 38 inches wide and 80 inches long, 76 inches wide and 80 inches long total
Surface Area4,800 square inches6,080 square inches6,048 square inches3,040 square inches per each side, 6,080 square inches total
AdvantagesWidely available: The most common couple size, with accessories easy to match
Easy to move: Good for couples who may relocate
Plenty of room: Two people can spread out or a small child can squeeze in
Spacious length: Long enough for most tall people
Pet-friendly: Pets can sleep at the foot of the bed
Custom comfort: Each side can be tailored to a partner's wants
Easy to move: Split mattresses are easier to shift than a king.
DisadvantagesPartners only: Not meant for parents who intend on co-sleeping
Costly: Pricier than a queen mattress
Takes up space: Can make a smaller bedroom feel cramped
Narrower: Noticeably less spacious than a king bed.
Harder to find: The size is less common than a king, as are its accessories
Specialty setup: Requires two separate mattresses and fitted sheets
Mattress gap: The split can create a gap in the middle, which some couples may not like
Best ForCouples who want an affordable mattressCouples who want their personal sleeping spaceCouples where one or both partners are tallCouples who are particular about their preferences

Key Takeaways

  • Ideal Mattress Sizes: Queen and king mattresses are the best choices for accommodating couples, with factors like budget, personal space preferences, and room size influencing the decision.
  • Advantages of Each Size: The queen mattress is widely available, easy to move, and typically suitable for most couples. The king mattress provides ample room for two people to spread out comfortably while the California king mattress is ideal for taller individuals and pet owners due to its generous length. Meanwhile, a split king mattress is customized to meet each partner’s preferences and offers greater ease of movement.
  • Considerations: The queen bed is meant for couples only, not for co-sleeping with children. The California king may be pricier and harder to find accessories for compared to a standard king. And the split king requires separate mattresses and may create a gap in the middle.

Other Mattress and Bedding Size Guides

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.


Just as the firmness and type of mattress you choose play a role in your overall comfort, finding the right size mattress is equally important. To optimize your comfort level during your sleep, space is crucial, not just the space of the bed, but also the aesthetics of space in your bedroom. You have to walk the balance between your needs, your room size, and your budget to get the most out of your mattress.

About the author

McKenzie Hyde is a Certified Sleep Science Coach and a full-time writer specializing in sleep health and the mattress industry. With a Master of Arts degree in literature and writing from Utah State University, McKenzie combines her passion for writing with her in-depth knowledge of sleep science. Her articles cover a wide range of topics, including best sleep practices for students, the consequences of sleep deprivation, and choosing the right mattress for back pain relief. McKenzie's dedication to delivering accurate and informative content makes her a valuable contributor to the field of sleep health.

View all posts

Discover the ultimate sleep system

Choose your mattress

Shop top-rated mattresses with proven sleep-boosting materials.

Get a pillow

We have the perfect pillow to pair with your mattress.

Browse Pillows

Pick out bedding

Bring out the best in your mattress with our soft and breathable bedding.

Browse Bedding