Bed sizes and mattress dimensions: a complete guide + chart

Is it time to replace your mattress? This mattress dimensions guide covers all six standard bed sizes to help you select the mattress that best suits your needs.

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Bed sizes chart

While mattress sizes vary from brand to brand, the chart below shows the typical dimensions of each bed, along with sleeper profiles and the recommended minimum room size. 

Bed size
Full
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Queen
Shop Queen mattress
Twin
Shop Twin mattress
Twin XL
King
Shop King mattress
California King
Dimensions
54" x 75"
60" x 80"
38" x 75"
38" x 80"
76" x 80"
72" x 84"
Minimum room size
9' x 9.5'
10' x 10'
7' x 9.5'
8' x 10'
12' x 12'
11' x 13'
Number of sleepers
1-2
1-2
1
1
2+
2
Maximum sleeper height
<6'
6' to 6'4"
<6'
6" to 6'4"
6' to 6'4"
6'5" or taller

Full

Recommended room size: at least 9’ x 9.5’
Best for: Single sleepers, like teens, or cuddly couples

Otherwise known as a double bed, a full mattress is a spacious choice for young adults who toss and turn in their sleep. It’s affordable and versatile, making it a popular choice for individuals furnishing their first solo apartment or for use in guest rooms.

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Queen

Recommended room size: at least 10’ x 10’
Best for: Single sleepers, couples, or even pets

The most popular bed size on the market, queen mattresses offer suitable space for two sleepers. You’ll typically find them in primary bedrooms, though queens are also great for guest rooms that see frequent visitors. Their popularity makes it easy to find bedding, accessories, and bed frames.

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Twin

Recommended room size: at least 7’ x 9.5’
Best for: Single sleepers, typically children 

The twin mattress sizeis the smallest of all standard bed sizes. Also known as a single bed, the twin’s narrow width accommodates most younger sleepers and fits well into small or shared bedrooms. They also make ideal daybeds and are suitable for bunk beds.

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King

Recommended room size: at least 12’ x 10’
Best for: Two sleepers with room to sprawl or small families

The  widest option among standard bed sizes, the grandiose king size mattress appears luxurious in extra-large primary bedrooms. 
Many brands, like Anmiz, make split king mattresses. With the same measurements as a king, split kings are two Twin XL mattresses that allow for customized sleep experiences with different firmness or elevation levels when paired with an adjustable base.

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Twin XL

Recommended room size: at least 8’ x 10’
Best for: Tall single sleepers, primarily teens and in college dorms

With the same width as the standard twin size but 5 inches longer, Twin XLs are ideal for taller sleepers. In rooms with limited space, it can provide optimal length to stretch out without taking up much extra square footage.
Placing two twin XLs together in one bed frame creates a split king, allowing for independent movement on adjustable bed frames.

California King

Recommended room size: at least 11’ x 11’
Best for: Two taller individuals, plus pets

Although narrower than a standard king, California king mattresses are the longest standard bed size. In comparing kings to California king beds, the latter offers 4 extra inches to stretch your legs or as a place for Fido to keep your feet warm.

Find your perfect mattress

We’re here to help you find that just-right fit — take our Mattress Quiz for personalized recommendations based on your sleep habits (and hurdles).

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100-Night Trial
10-Year Warranty
Free shipping + easy returns
Non-toxic materials
Our guarantees
100-Night Trial
Your 100-night trial begins the day your mattress is delivered to your doorstep. If you decide it isn't a perfect fit for you within the first 100 nights, we'll have it picked up and issue a refund. (Awesome, right?)

We do ask all customers to spend at least 21 nights on their mattress before starting a return or exchange so their bodies have enough time to adjust to Anmiz's unique feel + support!
10-Year Warranty
If there's something wrong with your mattress, we'll replace it for up to 10 years, starting from the date of original purchase. 

This warranty is valid only if the purchaser uses the product for personal consumer use. The warranty no longer applies after any resale, whether new or used. Original, dated proof of purchase by the original purchaser; official warranty document; and law tags are required to make a warranty claim.
Free shipping + easy returns
Get your mattress shipped straight to you at no extra cost – with complimentary white-glove delivery available on select mattresses. If you don’t love your mattress, just contact a Sleep Genius to confirm eligibility and arrange a return. To be eligible for a return, you must be within the 100-night trial period and have had the mattress for at least 21 days; the mattress must also be clean and undamaged. You will be refunded the full mattress price minus the value of any discount, interest accrued, and transportation charges. For questions about products purchased at a retail location, please contact the store directly.
Non-toxic materials
Our 100% nontoxic Anmiz-Y foam material is CleanAir GOLD and CertiPUR-US certified – as is our high-density polyurethane foam. The top GOLD rating from Intertek, a third-party quality assurance company, confirms that certified products will reduce health risks related to chemical exposure and meet the standards of other agencies promoting minimal VOC exposure. Anmiz products won’t produce strong off-gassing; at most, there may be a faint “new mattress smell” at first that comes off as nutty or woodsy, but should quickly fade.

Three unique collections.
Proven deeper sleep.

Every Anmiz mattress uses our patented GelFlex Grid for one-of-a-kind pressure relief, support, adaptability, and cooling.

Hush Hybrid Mattress
Hush Hybrid Mattress
Budget-conscious sleepers who want breathable comfort and reliable support for everyday use.
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Flow Classic Hybrid Mattress
Flow Classic Hybrid Mattress
Sleepers seeking a balance of pressure relief, motion isolation, and enhanced edge support for deeper, more restful nights.
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Luna Luxury Hybrid Mattress
Luna Luxury Hybrid Mattress
Discerning sleepers who want luxury-level comfort, full-body ergonomic support, and advanced cooling for the ultimate sleep experience.
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Considerations for your mattress size

When picking the right mattress, there is more to consider beyond its dimensions and minimum room size. Mattresses directly impact the quality of your sleep and should be considered an investment. Keep these factors in mind when shopping for a new mattress.

  • Sleeping partner

    Who will you share the mattress with? Queens may be a popularbed size for couples, but for couples with children or pets, a king might be best option.

  • Room size

    Leave at least two feet of space around the mattress to ensure you can move around comfortably. Also, consider door and staircase widths for maneuvering your mattress.

  • Body size

    Most beds are wide enough for at least one person but may not be long enough. For someone 6 feet or taller, consider mattresses at least 80” long.

  • Sleep position

    Consider how much space you need based on yoursleep position. If you move around when you sleep, are a side or combination sleeper, or just want extra space, go for a wider mattress.

  • Budget

    Understand what influencesmattress prices: size, quality, andmattress type. High-quality mattresses may cost more, but can last longer and support your body better.

  • Future plans

    Mattresses are a long-term investment. While a smaller mattress may be the right fit now, if you plan tomove with your mattressor grow your family within the next 5 to 10 years, consider the next size up.

FAQs

Frequently Asked Questions

1. What are the standard bed sizes in order?

The six standard mattress sizes in order of smallest to largest are: 

  • Twin: 38-by-75 inches
  • Twin XL: 38-by-80 inches
  • Full: 54-by-75 inches
  • Queen: 60-by-80 inches
  • California king: 72-by-84 inches
  • King: 76-by-80 inches
2. What are non-standard bed sizes?

While the six standard mattress sizes suit most sleepers, some individuals may require a nonstandard bed size. Families who co-sleep with multiple children or pets and tall or heavier individuals may sleep better in a bigger bed. Keep in mind that most nonstandard bed sizes are much less common and typically only sold online or as custom made-to-order mattresses.

Oversized Mattresses

Anything larger than a standard king bed is considered an oversized mattress. Below are a few of the most well-known extra large mattresses.

  • Olympic queen: 66-by-80 inches
  • Wyoming king: 84-by-84 inches
  • Texas king: 80-by-96 inches
  • Alberta king: 96-by-96 inches
  • Alaskan king: 108-by-108 inches
  • Family beds: 108 to 144 inches in width and 80 to 84 inches in length

Other Specialty Mattresses

The following bed sizes are examples of specialty mattresses, several of which are most common in RVs or other camping or recreational vehicles with sleeping areas.

  • Full XL: 54-by-80 inches
  • Short queen: 60-by-75 inches
  • Short king: 72-by-75 inches
  • Super king: 72-by-78 inches
3. What is the smallest size bed?

The smallest standard bed size is the twin mattress, measuring 38 inches wide and 75 inches long. Some mattresses made for infants and young children are available in smaller dimensions from children’s mattress manufacturers. The four most common children’s bed sizes are:

  • Bassinet: Traditionally about 15-by-30 inches
  • Mini crib: About 24-by-38 inches
  • Standard crib: About 28-by-52 inches
  • Small single: 30-by-75 inches
4. What is a 60-by-80 inch bed?

A 60-by-80-inch bed is a queen mattress. Like most standard bed sizes, the longer side of a queen bed is its length, and the shorter side is its width.