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What Are Mattress Sizes?

Updated November 22, 2021

What Size is My Mattress?

Mattresses come in different sizes. Each mattress size is designed to fit a specific need. Factors like room size, how active of a sleeper you are, and whether or not you share a bed influence which size best suits your needs. Our mattress size information guide is here to help make your choice easier. So, what are the different mattress sizes, and what is the right mattress size for you? Check out our chart of mattress dimensions and read through this article to find out.

See our Best Mattresses of 2021 article to see the top choice for any size.

See our list of the best mattresses in a box for more options.

Mattress Size Chart

show cm‚û¶show inches‚û¶
Size Dimensions Dimensions
King 76" x 80" 183cm x 203.5cm
Cal King 72" x 84" 183cm x 213.5cm
Queen 60" x 80" 152.5cm x 203.5cm
Full XL 54" x 80" 134.5cm x 203.5cm
Full 53" x 75" 134.5cm x 190.5cm
Twin XL 38" x 80" 96.5cm x 203.5cm
Twin 38" x 75" 96.5cm x 190.5cm

King Size Bed (76" x 80")

The best King mattresses are designed for couples who need a larger mattress and love extra space while they sleep. Great for sharing a bed with an active or very light sleeper, king-size beds provide plenty of space for one person to move without disturbing their sleep partner. Be sure to measure how much floor space a king will take up before buying one.

Read related article: What is a King Size Mattress?

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King Size
  • Designed for couples
  • Good for extra shoulder room
California King Size
  • Works for individuals or couples
  • Best for tall people over 6"2"

California King Bed (72" x 84")

The California king size is 4 inches narrower than the standard king size, but it is also 4 inches longer than the king and queen size. Made for taller individuals and couples, this bed ensures that your feet won't hang over the edge of the bed. California King mattresses are a luxurious option, great for master bedrooms.

Read related article: What is a Cal King Size Mattress?

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Queen Size Mattress (60" x 80")

As the most popular size, queen size beds have a suitable width for sharing and the length for most individuals. The queen size provides adequate space for most couples without taking up too much space in the room. If you're looking for a cost-effective and space-efficient bed, the queen size is the one you're looking for.

Read related article: What is a Queen Size Mattress?

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Queen Size
  • Designed for couples
  • Most affordable size for couples
Full Size
  • Designed for single sleepers
  • Wider than the Twin

Full Size Bed (53" x 75")

Also known as a double bed, a full-size bed is big enough for a single sleeper who wants something more spacious than a twin. Full mattresses work well for active sleepers and children/teens during their transition years.

Read related article: What is a Full-Size Mattress?

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Full XL Mattress (53" x 80")

Full XL mattresses are 5 inches longer than the full with the same width. This size works well for tall, active sleepers who want the largest size intended for single-person use. Full XL models cost the same as the couple-oriented queen size model.

Read related article: What is a Full XL Size Mattress?

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Full XL
  • Designed for single sleepers
  • Most spacious standard mattress size for single sleepers
Twin Size
  • Designed for single sleepers
  • Most affordable standard mattress size

Twin Size Mattress (38" x 75")

Standard twin-size mattresses are the smallest and least expensive of the standard mattress sizes. The twin size works well for kids and adults who don't need a spacious sleeping surface and want extra room in the bedroom.

Read related article: What is a Twin Mattress?

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Twin XL Mattress (38" x 80")

Twin XL mattresses are 5 inches longer than the twin size with the same width. Popular in dorm rooms, twin XL mattresses are intended for tall individuals who are not active sleepers and want a mattress that won"t take up a lot of space in their bedroom. This size is recommended for growing teens or tall adults looking to save space and money.

Read related article: What is a Twin XL Size Mattress?

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Twin XL
  • Designed for single sleepers
  • Most affordable size for tall individuals
Custom Size
  • Custom width and length
  • Made to order

Custom Size Mattresses

There are mattresses that exist outside of these seven standard mattress sizes. Custom mattresses are made to fit antique bed frames, RVs, and more. US-Mattress allows you to custom order mattresses to fit your sleeping needs.

Shop Custom Sizes

Mattress Size Comparisons

Stuck between two sizes? Read more about the differences between these bed sizes to help you determine what mattress dimensions would work best for you. Remember to keep in mind your room size as well as your needs and preferences.

Check out our Cal King vs King Size article.

Queen vs King Size

While many couples comfortably share a queen bed, some may feel that it's not enough space, and would prefer a king-size. A king bed is the same length as a queen but is typically 16 inches wider. This gives more room if you're finding yourself sleeping right at the edge of your queen mattress. If you have a partner (or maybe kids or a pet!) who moves around a lot, the extra width on a king can be really helpful for getting restful sleep. 

A queen size is better when you need to save some floor space in your bedroom. If you have a small space, a King might feel clunky and oversized. Take measurements of your room, keeping in mind that you need to leave space for walkways.

Full vs Queen Size

A full mattress (double bed) is 5 inches shorter than a queen and 7 inches narrower. While some couples may sleep successfully on a full bed, it can feel a bit crowded. Full mattresses are best for single sleepers who want something bigger than a twin size. Also, many people like to buy a full for their guest room since they're a bit smaller and cheaper.

If you sleep with a partner, your best bet is to go with a queen-size or larger. Your sleep quality will be much better if you have room for some movement.

Full vs Full XL

A full xl mattress is an inch wider than a full and 5 inches longer. It's a great option for tall sleepers who do not share a bed. A bit narrower than a queen (same length), a Full XL mattress is great for saving some floor space, but without being too narrow for an adult. If you like the full size but want to make sure your feet don't hang off the end, the Full XL size is the way to go.

Twin XL vs Full

Twin XL mattresses are commonly found in college dorm rooms because they're long enough for adults to sleep on but can be used on bunk beds to save space. They are longer than a full mattress by 5 inches and narrower than a full by 15 inches. Full beds are great for small bedrooms because they feel more luxurious than a twin or twin xl but don't take up as much space as larger sizes.

Twin vs Full Mattress

Twin mattresses and full mattresses are the same lengths at 75 inches but a full is 15 inches wider. This provides more space for single adults, while twin mattresses are great for kids.

Twin vs Twin XL

A twin XL mattress is the same width as a twin but 5 inches of extra length. This makes it more sleepable for tall kids or adults, which is why dorm rooms usually go with a twin xl rather than a twin.

FAQs and Resources

  1. Should you upgrade to a king? Read here.

  2. What size is a futon mattress?
    Usually, a futon mattress comes in full-size (54" x 75"). However, you can order them in other sizes as well, although they may be more difficult to find.

  3. What size is a crib mattress?
    A standard size crib mattress is 27 and ¼ inches wide by 51 and ¼ inches long, with a maximum thickness of six inches. This is recommended by federal safety guidelines. There are also mini-cribs and cribs with different shapes that have different dimensions.

  4. What is the biggest mattress size?
    The largest standard size is the Alaskan King bed, which measures 108 inches by 108 inches. You can order custom sizes larger than this. The Alaskan King isn't very common, so the next largest are Cal King and King beds. Kings are wider than California King beds but not as long.

  5. What size bed do most couples sleep on?
    The most popular mattress sizes for couples are queens and kings. 

Please note: all mattress manufacturers work on a 1-inch tolerance (except Corsicana, they have a 2-inch tolerance). Bed dimensions listed above could be up to 1-inch shorter and/or narrower than specified.


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