Mattress Size Calculator: Your Comprehensive Guide to Choosing the Perfect Mattress Size

A Mattress Size Calculator is a tool that helps you determine the perfect mattress size based on your room dimensions, number of sleepers, and personal comfort preferences. It simplifies the process of choosing a mattress, ensuring you get the right fit for a good night’s sleep. Standard sizes include Twin (38″ X 75″), Twin XL (38″ X 80″), Full (54″ X 74″), Queen (60″ X 80″), King (76″ X 80″), and California King (72″ X 84″). Always measure your bed frame before purchasing a mattress.”

I’m thrilled you’ve joined me on this journey to unravel the mysteries of mattress sizes. Now, I know what you’re thinking – “Mysteries of mattress sizes? Really?” But trust me, after spending years in the bedding industry, I’ve come to realize that the size of your mattress can make a world of difference to your sleep quality.

I’ve seen too many people struggle with mattresses that are too small to stretch out in or too large for their tiny apartment bedrooms. That’s why I’m a big fan of mattress-size calculators. These nifty tools take the guesswork out of choosing the perfect mattress size.

Whether you’re a college student buying your first mattress or a couple looking to upgrade to a king-size, I’m here to guide you through the process. So, let’s dive in and find the perfect mattress size for you!

What is a Mattress Size Calculator?

A mattress size calculator is a handy tool that helps you determine the perfect mattress size for your needs. It takes into account factors like your height, sleeping position, whether you share the bed and the size of your room.

The calculator works by providing you with a range of mattress sizes, from Twin to California King, each with specific dimensions. For instance, a Twin mattress measures 38″ X 75″, a Full size is 54″ X 75″, a Queen size is 60″ X 80″, and a King size is 76″ X 80″. There are also variations like the Twin XL and Full XL, which offer an extra 5 inches in length.

The aim of a mattress size calculator is to ensure you have enough space to sleep comfortably without your bed overwhelming your room. It’s a practical tool that takes the guesswork out of mattress shopping, ensuring you make an informed decision that leads to better sleep quality.

Remember, the right mattress size contributes to a good night’s sleep, which is crucial for your overall health and well-being. So, take the time to use a mattress size calculator before making your purchase. It’s a small step that can make a big difference in your sleep quality and comfort.

Now, let’s dive deeper into the world of mattress sizes and find out how to choose the perfect one for you!

Why is Mattress Size Important?

Alright, let’s dive into this one. After scouring the web, watching videos, and reading articles, I’ve gathered some valuable insights on why mattress size matters.

Comfort and Health

First and foremost, the size of your mattress plays a significant role in your comfort and health. As I learned from the video by Sleepopolis, a mattress that’s too small can lead to poor sleep quality and discomfort. If you’re cramped up in a bed that’s too small for you, it can lead to body aches and pains, and we all know that’s no fun.

On the other hand, a mattress that’s too large for you can also be problematic. As explained in the video by US-Mattress, if a mattress is too big, it can make you feel lost and unsupported, which can also lead to discomfort and poor sleep quality.

Room Aesthetics

Now, let’s talk about room aesthetics. The size of your mattress can significantly impact the overall look and feel of your bedroom. According to the article from Sleep Advisor, a bed that’s too big for your room can make the space feel cramped and cluttered. On the other hand, a bed that’s too small can make your room look empty and unbalanced. So, choosing the right mattress size can help create a harmonious and aesthetically pleasing bedroom environment.

Standard Mattress Sizes

When it comes to mattress sizes, there’s a whole world of choices out there. But don’t worry, I’ve got you covered. Let’s dive into the standard mattress sizes and their dimensions.

Twin Bed Dimensions

A typical single, twin, or bunk mattress is 38” wide x 75” long. This size is ideal for children who have outgrown cribs and toddler beds, and who are now ready to graduate to a larger mattress. It’s also a great choice for those who sleep in tight quarters, have small rooms, or share a room with a sibling or roommate.

Twin XL

The Twin XL is typically 80” L while still maintaining the 38” W. If you’re an adult looking for a bed that saves space and still is a comfortable choice, a Twin XL mattress may be perfect for you.

Full Bed Dimensions

Full-size mattresses measure 54” wide x 75” long, and these are also commonly referred to as “Standard Double.” This size is sufficient for adults that need more room than what a Twin can offer.

Full (Double) XL

A Full XL option is 54” x 80” giving you an extra 6 inches of leg space. If you do not require extra width but want some more room for your legs, this is a perfect option.

Queen Bed Dimensions

Queen-size mattresses are 60” wide x 80” long. They are typically long and wide enough to suit most sleepers. For those who sleep with their spouse, child, or pet, a Queen bed might be perfect.

King Bed Dimensions

A standard King size mattress is 76” wide and 80” long. This is a perfect mattress for couples who sleep with their kids or pets and want more room for themselves.

California King Bed Dimensions

The California King mattress is 72” wide x 84” long making it one of the biggest options on the market. This size is perfect for active sleepers, tall people, and couples with kids or pets. A California King is 4” longer but 4” narrower when compared to a standard King.

Here’s a quick comparison table for you:

Mattress SizeDimensions (Width x Length)
Twin38″ x 75″
Twin XL38″ x 80″
Full (Standard Double)54″ x 75″
Full XL54″ x 80″
Queen60″ x 80″
King76″ x 80″
California King72″ x 84″

Remember, choosing the right mattress size is not just about the amount of space you have in your room, but also about your personal comfort and lifestyle. So, take your time, weigh your options, and pick the size that suits you best. Happy mattress hunting!

How to Measure Your Bed for a Mattress

Alright, let’s get down to business. You’ve got a bed, and you need a mattress that fits it like a glove. No worries, I’ve got you covered. Here’s a step-by-step guide on how to measure your bed for a mattress:

  1. Clear the Deck: First things first, remove any sheets, blankets, or pillows from your mattress. We want the most accurate measurements, and those fluffy pillows aren’t helping.
  2. Width Measurement: Grab your tape measure and measure from the left side to the right side of your mattress to get the width. Make sure you’re measuring from the widest point on each side of the mattress and that the measuring points are on a straight line.
  3. Length Measurement: Now, measure from the head to the foot of your mattress to get the length. Again, measure from the furthest point out on each edge.
  4. Doorways and Halls: Don’t forget about the journey your new mattress will take to its final destination. Measure the width and height of any staircases or doors that you’ll use when you are moving the mattress.
  5. Bed Frame Measurement: If you’re also getting a new bed frame, measure it before you buy it to see if your mattress will fit. Measure the width, height, and length of the part of the bed frame your mattress will sit in.

And there you have it! With these measurements in hand, you’ll be ready to find the perfect mattress for your bed. Remember, a well-fitted mattress is key to a good night’s sleep, so take your time with these measurements. Happy mattress hunting!

Factors to Consider When Choosing a Mattress Size

When choosing a mattress size, there are several factors to consider:

  1. Room Size: Measure the length and width of your room to determine what size mattress will comfortably fit. Don’t forget to account for the dimensions of the bed frame and other furniture in the room.
  2. Number of Sleepers: If you’re a single sleeper, a full-size bed might be sufficient. However, if you share your bed with another person or pets, you might need a larger bed like a king-size.
  3. Sleepers’ Sizes: A queen-sized mattress is usually adequate for average-sized adults. However, if you’re taller or larger than average, or if you like to move around a lot in your sleep, you might prefer a king or California king mattress. There are also non-standard mattress sizes available, like an Olympic queen or an Alaskan king, if you need something even bigger.
  4. Sleeping Positions: Most people are combination sleepers, meaning they change positions throughout the night. Consider how much room you might need to move around or spread out when choosing a bed size.
  5. Budget: Larger mattresses tend to be more expensive. If you decide to size up, remember that you’ll also need to buy a new bed frame and sheets to accommodate the larger mattress.

Remember, the most important thing is that you feel comfortable and supported while you sleep. It’s worth investing in a mattress that suits your individual needs and preferences.

Custom Mattress Sizes

Custom mattress sizes are a fantastic solution for those who have unique bed frames or specific comfort needs that standard mattress sizes can’t meet. Whether you’ve got an antique bed, a European bed, or a bed designed for a boat, RV, or truck, a custom mattress can be made to fit perfectly.

Custom mattresses can be made in any size or shape you need. From the Alaskan King Bed (9′ x 9′) to the Texas King Bed (80″ x 98″), and even heart-shaped mattresses, the possibilities are endless. You can also get mattresses made with a hinge, cut corner, radius corner, or beveled edge.

Custom mattresses can be made from a variety of materials, including memory foam, latex, innerspring, and gel foam. They come with a luxurious certified organic cotton cover and are made with high-quality open-cell plant-based temperature-neutral foams. These foams are non-toxic and have been tested by the independent laboratory Certipurus.

All custom mattresses come with a 10-year manufacturer’s warranty and meet the strict federal CFR 1633 flame retardant mattress standards. They are compressed, sealed in plastic, boxed, and shipped to you via FedEx Ground.

Remember, when ordering a custom mattress, it’s crucial to measure your bed accurately. This includes the length, width, and height of the surface the mattress will go on. If the mattress is for an odd-shaped bed, a template or schematic may be required.

Custom mattresses are a great way to ensure a perfect fit and a good night’s sleep, no matter the size or shape of your bed.

Mattress Sizes Around the World

Mattress sizes can vary significantly around the world, with different countries having their own standards and terminology. Here’s a brief overview of how mattress sizes can differ in various regions:

United States & Canada

In the United States and Canada, standard mattress sizes include Twin, Twin XL, Full, Queen, King, and California King. The dimensions for these sizes range from 39 x 75 inches for a Twin to 72 x 84 inches for a California King.

United Kingdom & Ireland

In the UK and Ireland, mattress sizes include Single, Small Single (Cot), Double, Queen, King, and Super King. The dimensions range from 35 x 75 inches for a Single to 71 x 79 inches for a Super King.


European mattress sizes include Small Single, Single, Twin Extra Long, Small Double, Double, Euro Double, Euro King, and Super King. The dimensions range from 31 x 75 inches for a Small Single to 71 x 79 inches for a Super King.


In Asia, mattress sizes include Single, Twin, Double, Queen, King, and California King. The dimensions range from 36 x 74 inches for a Single to 72 x 84 inches for a California King.

Australia & New Zealand

In Australia and New Zealand, mattress sizes include Single, King Single, Double, Queen, King, and California King. The dimensions range from 36 x 74 inches for a Single to 80 x 80 inches for a Grand King.

Other Countries

Other countries, such as Brazil, South Africa, and Singapore, also have their own standard mattress sizes. For instance, in Brazil, mattress sizes range from Single (35 x 74 inches) to King (76 x 80 inches).

It’s important to note that these are standard sizes and custom sizes may also be available. Always check the specific dimensions when purchasing a mattress, especially if you’re buying from a different country.

Remember, a good night’s sleep starts with the right mattress size!


Choosing the right mattress size is more than just a matter of personal comfort—it’s about ensuring a good night’s sleep, which is essential for our overall health and well-being. With the help of a mattress size calculator, you can easily determine the perfect mattress size for your needs, taking into account factors like room size, the number of sleepers, your height, and your budget.

Whether you’re going for a standard size or a custom one, remember that the goal is to find a mattress that provides you with ample space to sleep comfortably. And while mattress sizes can vary around the world, the principle remains the same: your comfort is paramount.

So, take your time, do your research, and make an informed decision. After all, we spend a third of our lives sleeping—let’s make it count!

In the world of mattresses, size does matter. Whether you’re looking for a California King waterbed mattress or a standard baby crib mattress, the right size can make all the difference in your comfort and quality of sleep.

But size isn’t the only factor to consider. The thickness of your mattress also plays a crucial role in your sleep experience. For instance, you might be wondering, is a 10-inch mattress thick enough for your needs? Or perhaps you’re curious about how big a 10-inch mattress actually is.

And let’s not forget about the adventurous sleepers out there. If you love camping or road trips, you might be interested in learning about what size air mattress fits in a truck bed.

Lastly, if you’re planning to move or dispose of your old mattress, you might find it useful to know how many cubic yards a king-size mattress takes up.


What is the standard size for a queen mattress?

The standard size for a queen mattress is 60 inches wide by 80 inches long. This size is ideal for couples or individuals who want more sleeping space. It’s also a good choice for guest rooms.

How do I know what size mattress to buy?

The size of the mattress you should buy depends on several factors such as the size of your room, your sleeping habits, and your budget. Consider the space you have available, your sleeping position, and whether you sleep alone or with a partner. A mattress size calculator can be a handy tool to help you make the right decision.

Can you customize the size of a mattress?

Yes, you can customize the size of a mattress. Some manufacturers offer custom sizes to fit unique bed frames or specific needs. However, custom sizes may cost more and have limited options for bedding like sheets and mattress protectors.

How do mattress sizes vary in different countries?

Mattress sizes can vary significantly between countries. For instance, a US queen-size mattress measures 60 inches by 80 inches, while a UK king-size mattress, which is the closest equivalent, measures 60 inches by 78 inches. It’s important to check the dimensions rather than the size name when buying a mattress from a different country.

How do I measure my bed for a fitted sheet?

To measure your bed for a fitted sheet, first, remove any sheets from your bed. Then measure the width, length, and height of your mattress, including any mattress toppers. Your fitted sheet should match or be slightly larger than these dimensions.

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