Mattress Sizes and Bed Dimensions 101


The process of comparing mattress sizes starts with measuring the length and width.

No mattress size has a standard dimension because height/thickness varies by manufacturer and model. Choosing the proper bed size isn’t easy. Buying the best mattress that fits your needs is a long-term commitment.

What Factors Should I Consider When Choosing a Mattress Size? The number of sleepers and room Size are essential when purchasing a mattress.

This article will discuss the mattress size guide for all six different mattress sizes with dimensions and address some frequently asked issues so you can make an informed decision.

What are the dimensions of mattress sizes? Here are the up-to-date measurements of mattress sizes in inches.

Mattress Size Guide

What size mattress sizes?
Mattress Dimensions Chart
Mattress SizeDimensions in Inches (Width x length)
Twin38” x 75”
Twin XL38” x 80”
Full54” x 75”
Queen60” x 80”
King76” x 80”
California King72” x 84”
Mattress Measurements Chart

1. Twin

Dimensions: 38” x 75”

What size mattress is a twin? Twin mattresses fit nicely on daybeds, bunk beds, and tiny bed frames because they are typically 38” wide and 75” long.

A twin mattress can fit in a room at least 7 feet by 9 feet. This size is also perfect for children’s rooms and guest bedrooms.

2. Twin XL

Dimensions: 38” x 80”

Are you curious to know What is twin XL size? The twin XL is the most common mattress size for college dorm rooms, slightly longer than the Twin. Its dimensions are 38 by 80 inches, making it five inches bigger than a typical twin bed.

Is twin XL the same as double? Although the Twin mattress is the most budget-friendly option among bed sizes, Twin XL mattresses are 5 inches longer than Twin and Full mattresses.

You would have gotten your answer if you were curious. How much longer is a twin XL than a regular twin?

Still, you want to know: Can you use twin XL on regular Twin? No, the twin XL mattress is too long to fit into a typical twin-size bed frame.

3. Full

Dimensions: 54” x 75”

What measurements does a full-size mattress have? Typically, a full-size mattress is 54” by 75”. What distinguishes a double bed from a full bed? Indeed, “full vs double” refers to different sizes of mattresses.

What distinguishes a twin bed from a big bed? A twin mattress and a full mattress differ primarily in width. The length of a twin or full mattress is 75”. Conversely, a full-size mattress has a width of 54” by 75”, which is 16” more significant than a twin mattress.

It’s an ideal option for guest accommodations or for partners who enjoy cuddling throughout the night. It’s best for guest rooms or young people. A full bed can fit in a space at least 10 feet by 11 feet.

4. Queen

Dimensions: 60” x 80”

Queen bed sizes are by far the most popular option. What is the size of a queen-size bed? A queen-sized mattress is 60” wide and 80” long. The mattress’s height ranges typically from 8 to 14 inches.

With a queen-size mattress, you and your spouse, pet, or kid will have plenty of room to stretch out and get some shut-eye.

5. King

Dimensions: 76” x 80”

The second most favored option is a king-size mattress. In general, how big is a king-size bed? Among the standard mattress dimensions, a king-size mattress is the largest, often measuring 76 by 80 inches.

However, certain companies offer even larger, customized beds. King-size sizes are usually conventional; however, mattress manufacturers may differ.

6. California King

Dimensions: 72” x 84”

What size is a 72-inch bed? California king mattresses are 72” wide and 84” long. They are four inches narrower and four inches longer side to side than king-size beds, 76” wide and 80” long. A King mattress, on the other hand, is wider and has a somewhat larger surface area.

Is California King and Super King the same size? Not at all. A California King and a Super King bed differ in size. Compared to the Super King, which is 78” broad and 72” long, the California King is 72” wide and 84” long.

What Factors Should I Consider When Choosing a Mattress Size?

When buying a new mattress, consider these factors that can affect what mattress size fits your lifestyle:

Room Size

Measure the room’s length and width to determine its mattress size. A regular or mobile phone digital tape measure can give you a general estimate.

After taking final measurements, choose the mattress size that matches the room comfortably. Consider the bed frame and other room furniture measurements.

Number of Sleepers

A single person may find a full-size bed ideal, but two people plus a pet may find it too small. A king-size bed or, more significantly, might be something to think about for those with dogs and small children who want to crawl into bed regularly.

Sleeper Sizes

A queen-sized mattress suits most average-sized adults, yet individuals who are taller or more active might find greater comfort in a king or California king-sized mattress.

Explore Olympic queen and Alaskan king mattress sizes if you want something more significant than a king or California king.

Sleeping Positions

Even though we tend to identify with one sleeping position, such as the back, side, or stomach, most of us are combination sleepers.

Mattress Price

How much does a mattress cost? Usually, the bigger the mattress, the more it costs. The price of some mattress types, like King and California King, can be the same, but not always. If you get a bigger mattress, remember that you’ll need to buy a new bed frame and sheets to fit the extra inches.


Choosing the right mattress size is crucial and can significantly impact your sleep quality and comfort. If you’re searching for a large king-sized bed or a comfortable single mattress, knowing the measurements and features of each model is essential to helping you make an informed decision.

Now that you have a comprehensive overview of mattress sizes and their characteristics, you can confidently select the perfect mattress for your needs.

Remember to measure your room space and consider your personal preferences before deciding.


What distinguishes a Twin mattress from a Single mattress?

Is a single mattress the same as a twin? The single and Twin mattresses share identical dimensions, measuring 38 inches by 75 inches. Both are intended for individual use, accommodating one person. The twin XL variant also offers a slightly longer size within the same category.

Is there a mattress size smaller than a twin?

Yes, a 30×75-inch small single. This tiny bed is inches thinner than a twin. The compact single bed is the best mattress for toddlers who’ve outgrown the crib or households with limited space—a 48×84-inch super single.

Can a Full-size Bed Accommodate Two People?

Yes. The full-size bed can fit two average-weight individuals, but those who like to sprawl out or are tall or heavy people may have trouble. The double bed can accommodate two average-weight people but not kids or adults.

What is the Difference Between Full and Queen Size?

The full and queen mattresses are popular choices among mattress sizes frequently purchased. The full-size bed is smaller than its queen counterpart, with a width of 54 inches and a length of 76 inches.

In contrast, the queen-size mattress measures 60” by 80”, offering an additional 6” width compared to the full-size option.

How do a King and a California King differ in size?

Although regular and California king mattresses have similar surface areas, their proportions differ. A king-sized mattress is 76” by 80”, whereas a California king-sized mattress measure 72” by 84”.

Is there a larger bed size than a King?

An Alaskan King Bed surpasses the size of a standard king, measuring nine feet by nine feet (108 by 108 inches). Alternatively, a Family size, at 12 feet by 80 inches, is even broader but not as long.

What is the biggest mattress size available?

The “Alaskan King” mattress stands as the largest available mattress size for purchase.

What size bed results from placing two twin mattresses side by side?

Yes, combining two twin beds to match the width of a king bed (76 inches) is possible, yet the overall length might be slightly shorter. If having extra space at the head or foot of the bed isn’t an issue, you can join two twin beds using the best king bed frame.

Do two Twin mattresses equal a King mattress? No, combining two twin beds won’t create a king-size bed, as the resulting mattress would be shorter due to the five-inch difference between twin and king sizes. However, a king-size bed can be assembled using two twin XL beds.

What’s the standard size of a bunk bed mattress?

There are different types of types of bunk beds, but the most common size is Twin, which is 38” x 75”.

What size bed do most couples sleep on?

Many couples opt for a queen-size bed, the preferred mattress choice. The size offers ample room for two individuals to sleep comfortably together without creating a sense of separation.

What size bed is best for three people?

Queen, king, and California king are the bed sizes on which many individuals can sleep. Choosing between these three sizes depends on how much space you need and how well the larger sizes fit in your bedroom.

Does mattress size affect sleep quality?

The Sleep Council says that the size of your bed can significantly affect how well and how much you sleep each night. When it comes to beds, bigger is better.

About the author

Best Mattress Advisor Editorial Team

Our dedicated team of experts, with more than two years of experience in the bedding industry, is committed to helping you achieve your best sleep yet. From in-depth reviews to comprehensive guides, we cover almost every aspect of sleep products, including mattresses, pillows, bed frames, and accessories. Explore our website and discover why we're the go-to resource for all things sleep-related.

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Best Mattress Advisor Editorial Team

Our dedicated team of experts, with more than two years of experience in the bedding industry, is committed to helping you achieve your best sleep yet. From in-depth reviews to comprehensive guides, we cover almost every aspect of sleep products, including mattresses, pillows, bed frames, and accessories. Explore our website and discover why we're the go-to resource for all things sleep-related.

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