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A Comprehensive Guide to Mattress Sizes and Bed Dimensions

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Updated May 7, 2024

Looking for a new mattress but don't know where to start?

Check out our comprehensive guide to mattress sizes and bed dimensions! This guide will teach you everything you need to know about different mattress sizes and what might be best for your needs.

We'll also provide information on room size and dimensions so you can choose the perfect mattress size for your home. So whether you're looking for a twin, queen, or king-sized mattress, we've got you covered!

Understanding mattress sizes

First, let's take a look at the different mattress sizes available. Here is a breakdown of the most common mattress sizes and their dimensions:

  • Twin – 39" x 75"
  • Twin XL – 39" x 80"
  • Full/Double – 54” x 75”
  • Queen – 60” x 80”
  • King/California King - 76"x80"/72"x84"

When it comes to mattresses, there are also different thicknesses and depths available. Mattress depth typically ranges from 5”-14”; some styles are even thicker for more cushioning and support.

Small single or cot mattress

Small single or cot-size mattresses are perfect for those who don't have a lot of space in their home. They are also great for children's bedrooms and guest rooms as they provide enough room to move around but still fit into tight spaces.

Twin mattresses

Twin mattresses are the most common size for kids and can work in smaller, shared bedrooms. They are also a great choice for guest rooms or daybeds.

Full/Double mattresses

Full or double mattresses offer enough space for two people to sleep comfortably but are still a great choice for single-person use in larger bedrooms. They are also a great option for those who like to spread out when they sleep, as the extra space offers ample room for movement.

Queen mattresses

If you have enough space in your bedroom, queen mattresses offer more sleeping surface than full sizes, making them the most popular size for couples. They are also ideal for single-person use, as they offer more room to move around in than twin and full sizes.

King & california king mattresses

If you have a large bedroom with plenty of room, king, and California king mattresses are a great choice. These larger sizes provide more sleeping surface, making them perfect for couples or anyone who likes to spread out when they sleep.

Uncommon Mattress Sizes

In addition to the common sizes mentioned above, there are a few uncommon mattress sizes that may be available. These include:

  • Olympic queen: This mattress is 6" wider than a standard queen and provides more sleeping surface. Measures: 66” x 80”
  • Split king: This mattress includes two twins pushed together to form one large bed. It's great for couples who like to customize the firmness of their mattresses. Measures: 38” x 80” each
  • Grand King: This mattress is 4” wider than a standard king and 6” longer than a California King. Perfect for taller people who need more sleeping surface. Measures: 80"x98".
  • Super Single: This mattress is 6" wider than a twin XL and offers extra sleeping space. Measures: 45” x 80”
  • Sofa beds: These mattresses are typically smaller than the standard sizes mentioned above. They are perfect for accommodating guests in small spaces, as they can easily be folded up and stored away when not in use. Measures: Varies.
  • California King: This size is the same length as a standard king but narrower and perfect for tall people. Measures: 72”x84”
  • Alaska King: This is the largest mattress size available and measures 108” x 108”. It's perfect for those with very large bedrooms and plenty of space to spread out.
  • Texas King: This size is similar to the Alaska King but slightly narrower at 84”x84”.
  • Wyoming King: This is the smallest king-size mattress, measuring 72”x84”.
Best luxury king-size mattress
Tempur-Pedic TEMPUR-LuxeAdapt Mattress

Tempur-Pedic TEMPUR-LuxeAdapt Mattress

Choosing the right mattress size for your room

Now that you know the mattress sizes available, it's time to think about the size of your room. You want to make sure you have enough space to fit your bed comfortably without overcrowding your room. As a general rule of thumb, leave at least two feet of space around the bed for easy movement.

When deciding on a mattress size, also consider how you plan to use it. If you plan on using it as a guest room, a twin or full size is probably the best choice. If you plan to use it with a partner, consider getting a queen or king-size mattress for extra sleeping space.

For example, if you have a small bedroom, a full or queen-sized mattress might be best since they don't take up much space. On the other hand, if you have a large bedroom, then a king or California King might be best to ensure ample sleeping surface and space to move around.

Here are the minimum recommended room sizes for the most common mattress sizes:

Mattress sizeWidth and length (in inches)Recommended room size (in feet)
Alaska King
108 X 108
16 x16
Wyoming King
84 x 84
12 x 12
California King
72 x 84
12 x 12
76 x 80
12 x 12
60 x 80
10 x 10
54 x 75
9.5 x 10.5
Twin XL
38 x 80
9.5 x 10.5
38 x 75
7 x 10

No matter what size mattress you choose, be sure to measure your bedroom first and make sure it will fit before making your purchase. With the right size mattress and some careful planning, you’ll be sure to find the perfect fit for your room.

Also, read: What is a Hybrid Mattress? Here’s What to Know Before You Shop

Other factors to consider when choosing a mattress size

It's important to consider more than just the room size when choosing the right mattress size for your bedroom. Here are some other factors to consider.

Who's using the mattress

If you're sleeping alone, then a twin or full-size mattress will give you plenty of space. However, if two people are sharing the bed, then a queen or king size is recommended for maximum comfort and room to move around.

Type of mattress

Each mattress size may have different types available such as memory foam, hybrid, or latex. So it's important to consider the mattress type when choosing a size as some may not be available in all sizes.

Height of sleepers

If you're taller than average or if two people with different heights will be using the mattress, then a California King might be best for extra legroom and space to move around.

Location of bedroom

If your bedroom is located in an attic or other tight space, then a smaller size, such as a twin or full, might be more practical. You'll need ample room to maneuver the mattress up and down stairs or around tight corners.

Price of mattress

Your budget will also play a role in deciding on the mattress size. Generally, larger mattresses are more expensive than smaller sizes, so it's important to consider your financial situation when making a decision.

Choosing the best size mattress for you

Once you've considered all the factors above, then it's time to decide on the best-size mattress for your bedroom. It may take a bit of research and trial and error to find the perfect fit, but it will be worth it in the end because a good night's sleep is essential for a healthy and happy lifestyle.

Best cooling king-size mattress
Wave Hybrid Mattress

Wave Hybrid Mattress

Related Read: The Best King Size Mattresses for a Luxurious Night’s Sleep

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