Mattress Sizes Chart and Bed Dimensions Guide

By McKenzie Hyde Certified Sleep Coach

Last Updated On May 15th, 2024
Mattress Sizes Chart and Bed Dimensions Guide

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Key Takeaways

  • Factors to Consider: 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: 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 of the Future: A mattress you buy should last years and years, so it’s important to carefully consider your options. Take your time to choose the right mattress size and type that suits your needs.

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 factors that contribute to a good night’s sleep.

When looking for a new mattress, navigating the mattress market is crucial to ensure you find the perfect fit for a good night’s sleep.

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Choosing the right size from a wide range of options can be difficult, especially when there are sub-categories like mattress thickness that add an extra layer of consideration. With very little difference in dimensions between certain sizes and variations in thickness, getting the right fit for yourself can be a daunting task.

The size of your bedroom and your budget are key factors in your decision-making process when looking for the ideal bed size. 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.

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”).

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Standard Mattress Sizes

Most mattress brands offer the following six sizes.

California King

California King Size Mattress Dimensions72 inches by 84 inches

Minimum recommended room size: 12 feet by 12 feet

The California king size is one of the longest standard mattress sizes available. While narrower than a standard king, the extra length of a California king 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 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; the split king is really two twin XL mattresses placed side-by-side.

The split king mattress 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 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 bed conveniently fits into almost any room and can readily accommodate more than one sleeper.

Others may prefer a king for themselves but have a queen in their guest bedroom, comfortably accommodating extra sleepers in the house for a few nights.

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 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.

However, 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

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 bed.

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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. You may also need to hunt for specialty bedding and frames that fit these sizes, too.

Alaskan King

108 inches by 108 inches

Minimum recommended room size: 16 feet by 16 feet

The Alaskan king mattress is one of the largest mattress sizes available, measuring 9 feet on all sides to form a giant square space. This massive mattress provides ample space for multiple sleepers, serving as the perfect family bed. It’s also excellent for those who enjoy a luxurious, spacious sleeping experience.

However, due to its size, it may be challenging to find bedding accessories and furniture to accommodate an Alaskan king mattress. This size is not widely available and often requires custom ordering from a manufacturer.

Texas King

Texas King Mattress Dimensions80 inches by 98 inches

Minimum recommended room size: 12 feet by 14 feet

The Texas king mattress, also known as the “grand king,” measures 80 inches wide by 98 inches long. This size is 4 inches wider and 18 inches longer than a standard king mattress, providing extra room for taller individuals or those who want additional sleeping space.

Like the Alaskan king, the Texas king may require custom bedding and furniture due to its non-standard dimensions. This size is not as widely available as standard mattress sizes and may come with a higher price tag.

Wyoming King

Wyoming King Mattress Dimensions84 inches by 84 inches

Minimum recommended room size: 12 feet by 12 feet

The Wyoming king mattress is another oversized option, measuring 7 feet on all sides.

This mattress size offers a square sleeping surface, which can be ideal for couples who want equal space on both sides of the bed. The extra foot room can also be great for taller sleepers or those who want space to fold an extra blanket at the foot of the bed.

Olympic Queen

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. It’s one potential in-between option for those debating between queen and king mattresses.

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. However, the Olympic queen size is meant for RVs and camper trailers and are more commonly seen inside mobile homes.

Full XL

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 That said, some hosts prefer to offer a standard queen to accommodate couples.

Small Single

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.


27.25 inches by 51 inches

A crib mattress is approximately 6 feet by 4 feet and only meant to fit inside a crib.

The standard crib size is regulated by the federal government for safety reasons. So it’s pretty easy to find crib sheets that fit your mattress, as long as the crib mattress you choose is up to the current standards.

A crib mattress should not be more than 6 inches thick. Ideally a crib mattress should also offer a firm feel to support an infant’s body.

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

Other 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 other comfortable furniture—for example, a dresser and a bed side table where you keep a few nightstand essentials. You also need empty space for moving around the room.

Remember, the bedroom is your space to relax and recharge at the end of the day. An overcrowded space may cause stress and make sleep more difficult. You have to balance any wants you may have, such as space to store books in the bedroom, with this practical consideration.

So shoving a huge bed in a tiny room is not something we would recommend. However, sometimes you also have to make do with the mattress that suits your needs in the small bedroom you have available.

See our guide How to Decorate a Small Bedroom with a Queen Bed for tips on preventing your bed from dominating a space.

Location of the Bedroom

Keep in mind that king and California king size mattresses can be difficult to maneuver, so consider this when buying a new bed.

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.

Some people will also find it difficult to move a mattress by themselves regardless of size. We recommend enlisting a friend a family member to help or to acquire a dolly cart.


Your budget is another important factor, as it determines which options are available to you. 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. Keep an eye out for sales, too!

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.

  • A twin is perfect for children and teens, space-efficient, and cost-effective.
  • A twin XL is great for a tall individual, fits well in shared spaces, and is easy to move.
  • A full is versatile for guest rooms and offers more space for single adults.
  • A queen can accommodate another person when needed and fits most bedrooms comfortably.

However, there are also drawbacks to each of these sizes:

  • A twin or twin XL mattress may not be comfortable for adults.
  • A full or queen mattress may limit space for activities.
  • A queen mattress also costs more than smaller 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.

Consider your budget, personal space preferences, and available room size to decide on a mattress size for couples:

  • 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.
  • The California king mattress is ideal for taller individuals and pet owners due to its generous length.
  • The split king mattress is customized to meet each partner’s preferences and offers greater ease of movement.

However, the queen bed is meant for couples only, not for co-sleeping with children. For that, you would need a king bed or even an oversized mattress.

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 Size Guides

And our mattress comparison size guides:


How do I know if I need a bigger mattress?

If you feel cramped or pushed to the edge, have difficulty sleeping, or frequently disturb your partner’s sleep due to lack of space, it may be time to consider a larger mattress. Couples who feel they are constantly bumping into each other or individuals who sleep with pets or children may also benefit from a bigger bed.

As a general rule, if you find yourself wishing for more space or often waking up due to discomfort related to the size of your mattress, it’s a sign that upgrading to a larger size could improve your sleep quality and overall comfort.

Can I use a mattress topper to make my current mattress feel bigger?

While a mattress topper can add comfort and support, it will not increase the actual size of your mattress. Mattress toppers are designed to provide an extra layer of cushioning or firmness and can help extend the life of your mattress.

However, they do not change the physical dimensions of the bed. A too big mattress topper may even make it easier to roll out of bed if it excessively drapes over the sides.

There’s no easy life hack for getting around the fact that if you need more sleeping space, it’s best to buy a larger mattress.

Does size affect a mattress’s lifespan?

Mattress size usually doesn’t greatly impact how long a bed lasts. You’re more likely to need to replace a mattress from poor maintenance, lackluster construction and materials, or simply from prolonged frequency of use.

However, larger mattresses may be more prone to sagging or indentations due to increased surface area and weight distribution, especially if the mattress is of lower quality or not properly supported. If you notice signs of wear and tear, such as sagging, indentations, or decreased comfort, it may be time to replace your mattress sooner.

How do I ensure my new mattress will fit in my bedroom when moving?

Measure your bedroom dimensions and compare them to the sizes you’re considering. Don’t forget to account for additional furniture, such as nightstands, dressers, and walking space, to ensure a comfortable fit.

To ensure your setup goes smoothly, consider the size of your doorways, hallways, and stairwells, especially if you’re moving into an older home or apartment with narrow passages. If you’re moving into a smaller space, consider downsizing your mattress or exploring space-saving options like a Murphy bed or a loft bed to maximize your available space.

Can I buy a mattress online or do I need to visit a store to determine the right size?

Choosing the right mattress size is one of the easiest things to do from home, as you can measure out a rough space and imagine how the mattress would accommodate you. Plus, many online mattress retailers offer detailed size guides, room planners, and customer support to help you buy the right mattress without trying it out.

Trustworthy online retailers also offer risk-free trial periods, allowing you to test the mattress in your home for a specified number of nights before committing to your purchase. This trial period ensures that you have chosen the right size and comfort level for your needs.

How do I dispose of my old mattress when upgrading to a new size?

When purchasing a new mattress, many retailers offer removal and disposal services for your old mattress as part of their delivery process. This is often the most convenient option, as the retailer will take care of the heavy lifting and ensure that your old mattress is disposed of properly.

Alternatively, if you prefer to take care of things yourself, you can donate your old mattress as long as it is still in good condition and meets an organization’s donation guidelines. If your mattress is not suitable for donation, check with your local waste management company for recycling and junk pickup options. Some areas require special handling or pickup arrangements for large items like mattresses.

Can I order a custom sized mattress?

Yes, if you have a unique bed frame or require a specific mattress size, you can reach out to mattress manufacturers or specialty bedding stores to inquire about custom sizing options. Be sure to measure your bed frame carefully, including the interior dimensions and any unique features, such as built-in headboards or footboards, to ensure a proper fit.

Keep in mind that custom mattresses may come with a higher price tag and longer lead times compared to standard sizes.


Just as the firmness and type of mattress and even mattress thickness you choose play a role in your overall comfort, finding the right size mattress is equally important.

To sleep comfortably, you need enough space on your mattress and 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.

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