Bed Mattress Size Guide – UK and USA

Bed Mattress Size Guide

Ever found yourself confused when it comes to selecting a mattress size? You’re not alone! With so many different dimensions available, it’s easy to feel overwhelmed when trying to find the perfect fit for your bedroom. In this comprehensive guide, we’ll break down UK and USA mattress sizes and provide some handy tips for choosing the right one. So, let’s dive in!

UK Mattress Sizes

In the UK, there are four main mattress sizes to choose from. Here’s a quick rundown of each.


A single mattress measures 90 cm x 190 cm (35″ x 75″) and is ideal for children, teenagers, or adults with limited space. It’s also a great choice for guest rooms or those who prefer a cosy sleeping environment.


The double mattress size is 135 cm x 190 cm (53″ x 75″), making it suitable for couples or individuals who enjoy a bit more room to stretch out. It’s a popular choice for smaller master bedrooms or larger guest rooms.


King-size mattresses are 150 cm x 200 cm (59″ x 79″) and offer a more spacious sleeping area for couples or individuals who like plenty of room. They’re a popular choice for master bedrooms and provide a luxurious feel.

Super King

For those who crave ultimate space and luxury, the super king mattress measures 180 cm x 200 cm (71″ x 79″). It’s perfect for couples who want plenty of room to spread out, and it can also accommodate families with young children who enjoy snuggling in bed together.

UK Bed Sizes Explained

UK Standard Mattress Size Chart

Mattress TypeMattress WidthMattress Length
Small Single Mattress30 inches - 75 cm75 inches - 190 cm
Single Bed Mattress35 inches - 90 cm75 inches - 190 cm
Small Double Mattress48 inches - 120 cm75 inches - 190cm
Double Bed Mattress53 inches - 135 cm75 inches - 190 cm
King Size Mattress59 inches - 150 cm79 inches - 200 cm
Super King Mattress71 inches - 180 cm79 inches - 200cm

US Mattress Sizes

In the US, there are five primary mattress sizes to choose from.


The twin mattress measures 38″ x 75″ (96.5 cm x 190.5 cm) and is suitable for children, teenagers, or single adults with limited space. It’s often used in bunk beds, trundle beds, or smaller bedrooms.


The full mattress size is 54″ x 75″ (137 cm x 190.5 cm), offering more room than a twin but still suitable for individual sleepers. It’s a good choice for teenagers or adults who want a bit more space.


The queen mattress size measures 60″ x 80″ (152 cm x 203 cm) and is a popular choice for couples or single sleepers who enjoy having more room. It’s a versatile option that fits well in most bedrooms.


King-size mattresses in the US are 76″ x 80″ (193 cm x 203 cm), providing plenty of room for couples who value space and comfort. They’re often found in master bedrooms and are perfect for those who love a luxurious sleep.

California King

The California king mattress size is 72″ x 84″ (183 cm x 213 cm), making it slightly narrower but longer than the standard king-size. This mattress size is ideal for taller individuals or couples who need extra legroom. It’s also a popular choice for those who have larger bedrooms or want a truly luxurious sleeping experience.

Mattress sizes - What are the different dimensions?

US Standard Mattress Size Chart

Mattress TypeMattress WidthMattress Length
Twin Mattress38 inches - 97 cm75 inches - 190 cm
Twin XL Mattress38 inches - 97 cm80 inches - 203 cm
Full Size Mattress54 inches - 137 cm75 inches - 190 cm
Queen Mattress60 inches - 152 cm80 inches - 203 cm
King Size Mattress76 inches - 193 cm80 inches - 203 cm
California King Mattress72 inches - 183 cm84 inches - 213 cm

How to Choose the Right Mattress Size

Now that you know the different mattress sizes available in the UK and USA, it’s time to consider how to choose the right one for your needs. Here are a few factors to keep in mind :-

Mattress Width

One of the common complaints or requests of couples, for example, are that a mattress should not collapse or dip much in the middle of two sleepers. That causes them to tend to roll together. Although a pleasurable effect sometimes, it is not desired all the time. Coil strength and number are only part of the solution to that goal. It is essential that the mattress simply be wide enough to provide a large enough space for that goal to be met. A set of coils, no matter how high quality, can only do so much when there are only so many of them to support you.

Mattress Length

The aspect of length brings in new considerations, since nobody will be comfortable having their feet hanging out the end of the bed. But even when the bed is just long enough, it’s not really long enough, not for full comfort. In order to allow for movement in the night, an additional twelve inches or so of length is required. That same foot, or more, may be needed to accommodate the need for good heel or ankle support.

Depending on the design, a mattress may provide more or less support at the edge. Some have a steel wire wrapped in foam around the perimeter to keep the edge from collapsing when sitting on the mattress. That same wire plays a part in keeping the feet and lower leg well-supported when they are near the edge. The longer the mattress, the less the edge plays a role.

Sleeping Habits

Consider your sleeping habits when choosing a mattress size. Do you toss and turn a lot? Do you sleep with a partner or pets? If you need extra space to move around or accommodate additional sleepers, opt for a larger mattress size. Alternatively, if you sleep alone and don’t require much room, a smaller mattress size may be suitable.

Room Size

Before you start shopping, measure your bedroom to ensure the mattress you choose will fit comfortably. Remember to account for additional furniture and space to move around. It’s crucial to strike a balance between a comfortable sleeping area and enough room to live and move freely.

Budget and Preferences

Finally, take your budget and personal preferences into account. Larger mattresses tend to be more expensive, so consider whether the additional space is worth the extra cost. Think about your preferred sleeping environment – do you enjoy feeling cosy, or do you prefer lots of space to spread out? Your personal preferences play a significant role in choosing the perfect mattress size for you.

5 Ways British and American Bedrooms Are Very Different

In Summary

Choosing the right mattress size is essential for a good night’s sleep and overall bedroom comfort. Whether you’re in the UK or the USA, understanding the different mattress sizes available can help you make an informed decision. By considering factors like room size, sleeping habits, and budget, you’ll be well on your way to finding the perfect mattress to suit your needs.

Frequently Asked Questions – FAQs

Q. What are the key differences between UK and US mattress sizes?

A. While some sizes, like single and twin, are quite similar, there are notable differences between other mattress sizes in the UK and the USA. For example, UK king and super king sizes are different from US king and California king sizes.

Q. How can I determine the right mattress size for my bedroom?

A. Measure your bedroom and consider additional furniture and space for moving around. Also, take into account your sleeping habits, the number of people who will be using the bed, and your personal preferences.

Q. Can I use UK-sized bedding on a US mattress or vice versa?

A. While some bedding may fit, it’s essential to check the measurements carefully as there can be differences in size. It’s generally best to buy bedding that matches your mattress’s specific dimensions.

Q. What’s the best mattress size for a couple?

A. For couples, a double or larger mattress is recommended. A queen, king, or super king (depending on the country) will offer ample space and comfort for both individuals.

Q. Are larger mattresses always more comfortable?

A. Larger mattresses provide more space, but the level of comfort also depends on the mattress’s quality and your personal preferences. It’s essential to choose a mattress that suits your sleeping habits, body type, and comfort preferences, regardless of its size.