Mattress size guide

Mattresses seem to come in every shape and size, so where should you start?

Buying a new mattresses can be unnecessarily confusing. Every retailer seems to have their own standard mattress sizes and when you throw in that different countries call the same mattress by different names, it’s enough for anyone to lose sleep over.

That’s where we come in.

We’ve put together a guide to help you find the right mattress for you and we’ve started by explaining the different mattress sizes available in the UK.

Below you will find the seven standard mattress sizes available in the UK: single, small double, double, king, super king, cot and cot bed and their standard size measurements.

UK Mattress Sizes

What size mattress do I need?

The size of mattress you need will depend on your circumstances. How many people will be sleeping in the bed? How tall are those people? How much space do you have in your bedroom? Below you’ll find the different mattress sizes and who each one is best suited to.


  • Suitable for children and teens who don’t need much space
  • A great space saver, single beds can also be suitable guest beds

Small Double

  • Suitable for bigger teens who need more space to stretch
  • Suitable for one adult sleeping alone
  • Suitable for young couples with limited bedroom space


  • This is a classic size for average sized couples with average sized bedrooms
  • As a popular size choice there are also a lot of bed frame options to fit double mattresses


  • Perfect for couples with a little extra space in the bedroom
  • Suitable for especially tall or large people or couples who like lots of space to move in their sleep

Super King

  • Ideal for those with very large bedrooms
  • Perfect for people who require a lot of space to move around in their sleep
  • Great for large families as there’s room for everyone on a Sunday morning

Cot and Cot Bed Mattresses

  • Perfect for babies anywhere from 0-3 years old
  • Cot bed sized mattresses are specific to cot bed frames that have the ability to change into single beds as the child gets older

Tips for testing the size of your mattress:

Width: Lie on your back with your hands behind your head and your elbows sticking out sideways. Your elbows should not touch the edge of the bed or your partner.

Length: The mattress should be 10cm longer than the tallest person who will sleep on it

Where should I buy my new mattresses?

Bensons for Beds logo
eve mattress logo
Tweak Slumber logo
Marks and Spencer logo
Argos logo
Wayfair logo
Debenhams logo
Choice Furniture Superstore logo
Co-op Beds logo
B and Q Logo

How do UK mattress sizes compare to Europe and the USA?

ContentUK dimensionsEuropean DimensionsUS Dimensions
Single Mattress90cm x 190cm90cm x 200cm97cm x 191cm
Small Double Mattress120cm x 190cm120cm x 200cm122cm x 191cm
Double Mattress135cm x 190cm140cm x 200cm137cm x 191cm
King Mattress150cm x 200cm160cm x 200cm193cm x 203cm
Super King Mattress180cm x 200cm180cm x 200cm203cm x 249cm

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