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Double Mattress Size Guide Chiropractor's Guide(2023)

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Are All Double Mattresses the Same Size?

Have you ever wondered, are all double mattresses the same size? This article will provide you with insights into double mattress sizes, factors that affect those sizes, and tips on choosing the right one for your needs. With a conversational tone and engaging content, you’ll be a double mattress expert in no time!

Double Mattress Sizes

Double Mattress Sizes by Country and Type

Country/Region Standard Double (Feet) Standard Double (cm) Small Double (Feet) Small Double (cm)
United States 4.5 x 6.25 137 x 190 4 x 6.25 122 x 190
United Kingdom 4.5 x 6.25 135 x 190 4 x 6.25 120 x 190
Australia 4.75 x 6.5 137 x 187 4 x 6.25 122 x 188
Europe 4.5 x 6.5 140 x 200 3.75 x 6.5 120 x 200
Canada 4.5 x 6.25 137 x 190 4 x 6.25 122 x 190


Standard Double Mattress

The standard double mattress, also known as a full-size mattress, typically measures 54 inches wide by 75 inches long. This size is considered to be a standard size for a double mattress in many countries. However, there can still be slight variations depending on the brand and country.

Small Double Mattress

A small double mattress, sometimes referred to as a “three-quarter” mattress, is smaller than the standard double mattress. It usually measures 48 inches wide by 75 inches long, providing a slightly cosier sleep surface.

Custom Double Mattress

In some cases, you might come across custom double mattresses that differ from the standard and small double sizes. These are usually designed to cater to specific customer requirements, such as an unusual room layout or a unique bed frame.

Factors Affecting Mattress Sizes

Country Standards

Double mattress sizes can differ between countries. For example, a standard double mattress in the United States may have slightly different dimensions than one in the United Kingdom or Australia. It’s essential to keep this in mind when purchasing a mattress, especially if you’re buying from an international retailer.

Brand Variations

Even within a country, some brands may have small variations in their mattress sizes. This could be due to the materials used, manufacturing processes, or simply a brand’s preference to create a unique product.

Material and Construction

The materials and construction methods used to make a mattress can also affect its size. For example, a memory foam mattress may have a slightly different size compared to an innerspring mattress due to the way they are constructed and the materials used.

Why Size Matters


Selecting the right mattress size can have a significant impact on your sleep quality. A mattress that is too small may cause discomfort, while one that is too large may not provide the support you need.

Room Size

Your room size is an essential factor to consider when choosing a mattress size. A double mattress that is too large for your space may make your room feel cramped, while one that is too small may not provide enough room for you and your partner to sleep comfortably.

Aesthetic and Functionality

The size of your double mattress can also affect the overall aesthetic and functionality of your bedroom. A mattress that fits well within your space can create a more harmonious look and improve the flow of the room.

Choosing the Right Size

Assessing Your Needs

Before purchasing a double mattress, it’s crucial to assess your needs. Consider factors such as how many people will be sleeping on the mattress, whether you need extra space for pets or children, and your sleeping habits, such as tossing and turning.

Measuring Your Space

Before deciding on a mattress size, measure your bedroom carefully to ensure that the mattress will fit comfortably. This includes accounting for space around the bed for other furniture, like nightstands, and allowing for sufficient room to move around the bed.

Considering Future Changes

It’s also essential to think about any potential future changes in your living situation, such as moving to a new home, having children, or getting a new bed frame. These factors may impact the size of the double mattress you choose.

Tips for Buying a Double Mattress

Online vs. In-store

When purchasing a double mattress, consider whether you prefer to buy online or in-store. Both options have their advantages and disadvantages, such as convenience and the ability to test the mattress in person.

Reading Reviews

Reading reviews from other customers can provide valuable insights into the quality, comfort, and durability of a double mattress. Look for reviews that discuss the size and whether it met the customers’ expectations.

Warranty and Trial Periods

When buying a double mattress, always check for warranty and trial period information. A good warranty and trial period can give you peace of mind, knowing that you can return or exchange the mattress if it doesn’t meet your needs.


In conclusion, not all double mattresses are the same size. There are variations in sizes due to factors such as country standards, brand variations, and material and construction. It’s essential to consider your needs, room size, and future changes when choosing the right double mattress size. Follow the tips provided for a successful mattress-buying experience.


1. Are all double mattresses the same size?

No, there can be variations in double mattress sizes due to factors such as country standards, brand variations, and material and construction.

2. What is the size of a standard double mattress?

A standard double mattress typically measures 54 inches wide by 75 inches long, but dimensions may vary slightly depending on the brand and country.

3. What is a small double mattress?

A small double mattress, also known as a “three-quarter” mattress, is smaller than the standard double mattress and usually measures 48 inches wide by 75 inches long.

4. How can I choose the right double mattress size for my needs?

Consider factors such as your room size, sleeping habits, and any potential future changes in your living situation when choosing a double mattress size.

5. What should I look for when buying a double mattress?

When purchasing a double mattress, consider factors such as online vs. in-store shopping, reading customer reviews, and checking for warranty and trial period information.

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Dr Lawrence Woods DC

Dr Lawrence Woods DC


My goal is to create the highest quality ergonomic office chairs and accessories for unmatched comfort.

With 30 years of spinal healthcare experience in Ireland as a chiropractor, I learned the value of high-quality sitting for living a happy and healthy life.

I have a Chiropractic Degree from Life Chiropractic College West and I am NBCE Physiotherapy certified.


About Me



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