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Mattress Sizes
How to Choose the Right Mattress Size for You

Last updated on June 22, 2022


Beds come in a variety of different sizes to accommodate different needs and preferences. 

Each mattress size corresponds to standardized dimensions for the length and width, so that mattresses from different brands will all fit the same bed frames and headboards.  The most common mattress sizes are King, Queen, Full (Double), and Twin (Single).

The bestselling mattress size in the United States is queen size.

Standard Mattress Sizes

Below are the measurement dimensions (in inches) of the most popular mattress sizes in the United States and Canada. European mattresses sizes are different.

Mattress Size


King 76" wide x 80" long
• California King 72" wide x 84" long
• King Split (aka, Dual King)

78" wide x 80" long
(2 mattresses, each 39" wide x 80" long)

• Alaskan King 108" wide x 108" long (9' x 9')
Queen 60" wide x 80" long
California Queen 60" wide x 84" long
Olympic Queen
66" wide x 80" long
• Queen Split

60" wide x 80" long
(2 mattresses, each 30" wide x 80" long)

Full (aka, Double) 54" wide x 75" long
• Full Extra Long (Double Extra Long)
54" wide x 80" long
• Three-Quarter (3/4 Bed) 48" wide x 75" long
Twin (aka, Single) 39" wide x 75" long
• Super Single 48" wide x 84" long
• Twin XL (Single Extra Long)
39" wide x 80" long
Crib (or Toddler Bed) 28" wide x 52" long


Choosing the Right Mattress Size

In choosing a mattress size, make sure to choose a size that is big enough to comfortably fit those sleeping in the bed, but small enough to fit comfortably in the room where it will be placed (including enough room for each person to get in and out of bed!). Consider your future needs as well, since an investment in a quality mattress should last you 8-10 years.  Lastly, it doesn't hurt to take some measurements to make sure the size you choose will fit through the doorway, hallways, and stairwells of your home.

Mattress Size Trends

Not surprisingly, bed size preferences appear to be getting larger over time. Until as recently as the 1970's, the most popular bed size was Full (which is why full-size mattresses are sometimes referred to as "standard" size). However, the queen-size bed is now the most widely purchased mattress size in the United States, followed by king-size mattresses. The California king (also known as "Western King") is slightly longer and narrower than a standard king (sometimes referred to as an "Eastern King").

Unique Mattress Sizes

Though most mattress models are available across a wide variety of sizes, certain bed types are known for being more limited in their size selection. For instance, hard-sided waterbeds are generally not available in traditional bed sizes, but rather are found in the longer California king, California queen and super single sizes. Similarly, "king split" and "queen split" mattresses tend to be most commonly used with adjustable beds, since each partner will be able to adjust their own side independently. Likewise, "extra long" bed sizes are most often found in dormitories; 3/4 mattresses are used primarily with antique bed frames, and crib mattresses are naturally used only in baby beds and toddler beds.

When considering an unconventional mattress size, be aware that your selection of bedroom furniture (eg, bed frames, headboards, footboards, and the like) as well as sheets and other bedding will be much more limited -- and perhaps more expensive -- in these less popular sizes.

Find the Right Bed

Not sure which type of bed to buy? Answer a few questions to see good matches for you with GoodBed's unbiased, personalized results.

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This is awesome. Now I feel equipped to walk in somewhere and say with certainty, "This is exactly what I'm looking for."
— Sara in Phoenix, AZ

What size of bed are you looking for?

Not sure? Go to Mattress Size Guide