Mattress Size Guide

All our mattresses and bed sizes are standard UK bed sizes as specified by the National Bed Federation. If you’re buying a mattress for an existing bed, cot or crib it's always best to measure the bed to make sure it's a standard size.

If it's not, don't worry, we hand make all of our products so we can make something in the size you need, just give us a call on 01392 877 247 or follow the made to measure guide on all of our mattress product pages.

The following are our standard adult sizes which cover mattresses, toppers, beds and bed bases:

Mattress Size Dimensions (cm)  Dimensions (Ft' & in")
Cot 120cm x 60cm 23.6" x 47.2"
Cotbed 70cm x 140cm 27.5" x 55"
Small single 75cm x 190cm 2'6" x 6'3"
Single 90cm x 190cm 3'0" x 6'3"
Small double 120cm x 190cm 4'0" x 6'3"
Double 137cm x 190cm 4'5" x 6'3"
King 150cm x 200cm 5'0" x 6'6"
Queen 160cm x 200cm 5'3" x 6'6"
Superking 180cm x 200cm  6'0" x 6'6"
Emperor 200cm x 200cm 6'6" x 6'6"


Mattress Depth

How we measure the depth of our mattresses
The mattress depths stated on our website are approximate and are measured at their fullest point. The mattress is placed on a flat firm surface with a straight measure placed on top. The depth provided is the measurements between these points. Please refer to the illustration shown. If you have any queries on our sizing, contact our team on 01392 877247.

The depth of each individual mattress can be found in the technical information on each mattress page.

How to Choose the Right Mattress Size

We’ve all heard of the saying "you can’t make a pancake bigger than the pan." The same principle applies to mattresses. You need to measure your bed, and then purchase a mattress that is at least as long as your bed plus an inch or two.

There are a few things to keep in mind when purchasing a mattress, whether it's for a single bed, double bed or a superking size bed.

  • First, you want to keep in mind the size of your bed - the mattress dimensions should align with the size of your bed frame. This is not always an easy thing to do, as many beds and mattresses are not standard sizes so always measure your bed frame accurately before making a decision.
  • Second, you want to know whether or not your mattress will need a box spring or if it will be OK on just the slats that go from headboard to footboard for support instead. You may need a box spring if you intend on getting a larger mattress or one that is heavier than your current mattress.
  • What are the Most Common Mattress Sizes in the UK?

    If you are looking to buy a new mattress, you are probably wondering what the most common sizes are. You might have seen this information in reviews or on the side of mattresses, but it can be useful to have some idea ahead of time and plan around bedroom space before making any decisions.

    The most common size of mattress is a UK single which measures approximately 3ft by 6ft (90cm x 190cm). Single beds are typically used in guest rooms or child’s bedroom.

    There are also several other commonly available UK mattress sizes including double size bed (4ft x 6ft or 137cm x 190cm) and King size bed (5ft x 6ft o 150cm x 200cm). Double beds are typically used in children’s or teenagers' bedrooms and sometimes as guest beds while King size beds are used in adults rooms or shared bedrooms for couples.

    At Naturalmat, we start our range by offering the following standard UK mattress sizes:

    Cot mattress size

    The size of the cot mattress is dependent on the size of the cot. Most manufacturers have a standard size for their mattresses so it should not be difficult to find one that matches your cot perfectly. The standard size in the UK that we manufacture to is 60cm × 120cm.

    Keep in mind that a cot mattress is traditionally smaller than a cot bed mattress.

    Cot bed mattress size

    Cot bed mattresses are a great option for a first bed for your baby.

    The standard size of a cot bed mattress in the UK is 70cm x 140cm, which will fit in all standard sized cots. The 140 cm length and the 70 cm width will accommodate most children up to about 3 years old, giving them more space to relax.

    A traditional crib mattress may not provide enough support for your child, whereas the mattress in an adjustable height crib like a cot bed does.

    The 70cm x 140cm width and length will fit nicely around the wall of the cot, while still giving enough room for your baby to move around and play comfortably.

    Single mattress size

    A single mattress is usually a mattress that is not as wide as a double mattress and not as long as a king-size mattress. Single mattresses often come with bed frames and can be used on their own or with other mattresses to create any kind of bed arrangement. The standard single mattress size in the UK is 90cm x 190cm.

    Single mattresses are the most common size in the UK, with many households combining two together to form a double bed. They can be more affordable than double bed sizes and can be used in creative ways in a bedroom as they take up less space than a double or king size bed. Single mattresses and beds are often a great choice for growing children and teens.

    Double mattress size

    A double mattress is another common size for beds and mattresses in the UK, they’re ideal for two people, especially if your bedroom isn't a massive size. The standard double bed size in the UK for a double mattress is 137cm x 190cm.

    Our double mattresses are made from organic materials which are both supportive and comfortable so you can sleep better at night.

    King size mattress

    A king size bed is usually a little longer and wider than a double bed, making it the perfect choice for tall people who need extra leg room. It can fit up to two people comfortably - the standard size in the UK is 150cm x 200cm.

    It’s a good idea to check the inner dimensions of the bed frame so you know for sure it will fit your mattress.

    It might sound obvious, but you should always buy a mattress that fits the size of your bed. A smaller mattress may not be the right choice for a bigger bed because it may not provide enough support for your body.

    Also, keep in mind that a king size mattress and bed might struggle to fit in smaller bedrooms.

    Superking mattress

    Superking size mattresses and beds are 180cm x 200cm. These are some of the biggest beds we have available, and they're great for families who enjoy plenty of space to drift off to sleep, as well as for those of you who just value lots of room!

    Our superking size beds are a little more expensive than our king size beds, but we think they're worth it. They are more comfortable, and there's no doubt about it - a superking size bed is more spacious than a king size bed.

    Emperor mattress

    The emperor bed is not a common bed because it's very large. The standard UK size for an empower bed is 200cm x 200cm, making it the largest mattress size on our list.

    It's difficult to get into smaller homes and apartments, making it more suitable for larger houses, villas, or mansions where you can easily transport the mattress to the bedroom of choice. 

    But if you are looking for a mattress that has a lot of space, then this is the best mattress for you.

    With all of the available options, the most important factor for most people when choosing a mattress is comfort.