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Mattress Sizes and Dimensions

A guide to the dimensions of each mattress size and how to pick the best for you

Logan Foley

Written by

Logan Foley, Certified Sleep Coach

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We regularly assess how the content in this article aligns with current scientific literature and expert recommendations in order to provide the most up-to-date research.

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.

Mattress Size Dimensions (Width x Length)
California King 72″ x 84″
King 76″ x 80″
Queen 60″ x 80″
Full 54″ x 75″
Twin XL 38″ x 80″
Twin 38″ x 75″
Scroll L – R for more details

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:

Are You Trying to Decide on a Mattress Size? Take Our Quiz to Find a Bed That’s Best For You!

If you’re in the market for a new bed, it’s important to consider the right size as well as many other factors. Our mattress quiz looks at sleep position, body weight, and more to help you find the perfect mattress.

Find Your Mattress

Answer 5 Easy Questions To Discover Your Perfect Mattress

What position do you sleep in?

  • side sleeper icon


    You normally wake up sleeping on your side

  • side sleeper icon


    You normally wake up sleeping on your back

  • side sleeper icon


    You sleep lying flat on your stomach

Do you experience any pain while sleeping?

  • side sleeper icon

    Back and / or Side Pain

    I often have back and/or side pain after waking up and into the day

  • side sleeper icon

    Neck and / or Shoulder Pain

    I often have neck and/or shoulder pain after waking up and into the day

  • side sleeper icon

    Little to No Pain

    I rarely experience any pain from sleep

Do you have any material preferences?

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    I prefer a more traditional coil-based mattress

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    I prefer a coil-less design made of memory foam, latex, and fabric.

  • side sleeper icon

    No preference/ Other

    I don't mind any material as long as I feel good sleeping

Do you sleep hot?

  • side sleeper icon


    You tend to heat up at night and wake up sweaty often

  • side sleeper icon


    You never have issues being too hot during the night

Do you sleep with a partner?

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    We'll recommend beds that have superior motion isolation to account for partner movement during the night

  • side sleeper icon


    Motion isolation is less of a factor in our mattress recommendations

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Mattresses for Couples & Families

The sizes queen, king, and California king are all large enough to comfortably sleep multiple people. The big consideration with these three sizes is how much extra space you want, as well as how well the larger sizes will fit into your bedroom.

California King King Queen
Dimensions 72” wide, 84” long 76” wide, 80” long 60” wide, 80” long
Surface Area 6,048 square inches 6,080 square inches 4,800 square inches
Best For Taller couples; couples sharing a bed with a pet Couples who prefer maximum space; couples sharing a bed with a child Couples without children or pets sharing the bed
  • Extra length is ideal for tall people
  • Well suited for those who share the foot of their bed with pets
  • Maximum width is beneficial for couples and families with small children
  • Accessories are widely available
  • The most common mattress size, making accessories widely available & affordable
  • Easier to move than larger King beds
  • It can be difficult to find accessories
  • The most expensive mattress size
  • Difficult to move
  • More expensive than the popular Queen size
  • Can make smaller rooms feel cramped
  • Difficult to move
  • Significantly less spacious than King/King XL
  • Will feel cramped for couples sharing the bed with small children
Scroll L – R for more details

Beds for Single Sleepers

The sizes full, twin XL, and twin are better suited for single sleepers. A full mattress could potentially accommodate a couple in a pinch, but twin XL and twin are definitely only for single people. There are a few other considerations to keep in mind with these sizes:

Full (Double) Twin XL Twin
Dimensions 54” wide, 75” long 38” wide, 80” long 38” wide, 75” long
Surface Area 4,050 square inches 3,040 square inches 2,850 square inches
Best For Single adults under 6′ tall Single adults over 6’ tall; teens Single adults under 6’ tall; children & teens
  • Relatively spacious for single adults
  • Affordable
  • Versatile; could potentially be used for a couple or a guest bedroom
  • Ample legroom for taller people
  • Room for single sleepers to share their bed with pets
  • Same length as a Queen or King mattress
  • Very affordable
  • Accessories & bed frames widely available
  • Nearing the price of a Queen, with much less space
  • Cramped for those over 6’ tall
  • Accessories can be harder to find/more expensive
  • Not suited for couples
  • Not suited for couples
  • Can be outgrown
Scroll L – R for more details

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 mattress. 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, shoppers should keep in mind that price is not the only indicator of quality and it is possible to find a cheap mattress that will meet your needs. 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.

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About Our Editorial Team

Logan Foley

Certified Sleep Coach

Logan has extensive experience testing sleep products and producing sleep content. She is also a Certified Sleep Science Coach.