Mattress Sizes

Before you start your journey to a better sleep, you need to consider size. This quick guide will give you the lowdown on both UK standard mattress sizes and European mattress sizes, as well as useful tips for choosing the perfect size for your needs.

UK standard mattress sizes

European mattress sizes

  • Cot:1'10" x 3'9" (60cm x 120cm)
  • Single: 3' x 6'6" (90cm x 200cm)
  • Small double: 3'11' x 6'6" (120cm x 200cm)
  • Double: 4'7" x 6'6" (140cm x 200cm)
  • King: 5'3" x 6'6" (160cm x 200cm)
  • Super king: 6' x 6'6" (180cm x 200cm)
  • Shop European and Ikea mattresses sizes

What size is a single mattress?

A small single mattress can be a great space-saver, while still providing ample room for growing children and teens. Single mattresses are also ideal for use in guest bedrooms and attic rooms.

  • UK single mattress size: 3' x 6'3" (90 x 190cm)
  • European single mattress size: 3' x 6'6" (90 x 200cm)

    Shop single mattresses


What size is a small double mattress?

If you're a couple and have limited space, then a small double bed can offer a cosy solution if a full-sized double is too wide.

A small double 4ft mattress is also great for rapidly-growing teenagers or individuals who need that extra-bit of room to stretch out and be comfy.

  • UK small double mattress dimensions: 3'11" x 6'3" (120cm x 190cm)
  • European small double mattress dimensions: 3'11' x 6'6" (120cm x 200cm)

    Shop small double mattresses 


What size is a double mattress?

Double mattresses are popular with couples who are also first-time buyers, offering sufficient space without breaking the bank.

Of course, individuals looking to really spread-out eagle-style every morning can also go for a double mattress that'll give them all the room they need.

  • UK double mattress dimensions: 4'6" x 6'3" (135cm x 190cm)
  • European double mattress dimensions: 4'7" x 6'6" (140cm x 190cm)

    Shop double mattresses


What size is a king size mattress?

For those who've got the room, king size mattresses are hard to resist. A restless sleeper can go through the night without disturbing their partner, and lazy duvet days step-up a notch thanks to the ample room provided - especially when you're lying upon a super-comfortable gel infused foam king size mattress.

  • UK king size mattress dimensions: 5' x 6'6" (150cm x 200cm)
  • European king size mattress dimensions: 5'3" x 6'6" (160cm x 200cm)

    Shop king size mattresses


What size is a super king size mattress?

Sleep doesn't get deeper and relaxation doesn't get more sumptuous than with a super king size mattress. If you've got the space in your bedroom, then a super king mattress will provide the ultimate night's sleep. While they're built for two people to really stretch-out, there's no stopping the whole family jumping in on a lazy Sunday morning. 

  • UK super king mattress size: 6' x 6'6" (180cm x 200cm)
  • European super king mattress size: 6' x 6'6" (180cm x 200cm)

    Shop super king mattresses


What size is a cot mattress?

When buying a mattress for your little one you want it to be safe, comfy and the perfect size.

The mattress you choose should be a snug fit, with gaps of no more than 4cm down the sides and a mattress thickness of 8-10cm. Generally, cot mattresses are available in two sizes:

  • UK cot mattress size: 1'8" x 3'9" (60cm x 120cm)
  • European cot mattress size: 1'10" x 3'9" (60cm x 120cm)

You also want to make sure the quality is top notch and safety is completely assured.

Our Safe Nights Memory Wool baby mattress has won a number of prestigious awards, including Gold for Best Nursery Product in the Mother & Baby Awards 2016.

All Silentnight mattresses come with the crucial BSI number: BS 1877-10:2011+A1:2012, which means they meet British Standards safety requirements for bedding.

Shop cot mattresss


Useful tips for choosing the right bed size

  • Ensure that the mattress dimensions are 10cm longer than the tallest person using the mattress. Nobody wants cold feet on a chilly winter's night after all.
  • You also want to be able to stretch when you wake to really start the day. Get the width right by tucking both hands under your head and if your elbow touches the edge of the mattress or the person next to you, then you need larger mattress measurements.
  • If you're giving your bedroom a makeover make sure you measure the space you have in your room. It could be the difference between a modest double and a mega super king.

At Silentnight, we know the secret to a great night’s sleep

You have the total reassurance of knowing you are choosing a quality product from the UK’s biggest bed manufacturer with 70 years of bed making heritage.

All our upholstered beds and mattresses are handmade in our UK factory

There are no short cuts to quality and safety, we guarantee total quality as standard

We are proud to be the UK's most trusted bed brand

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All our upholstered beds and mattresses come with our reassuring product guarantee