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The bed and mattress size guide

Choosing the right size bed and mattress is one of the most important decisions to make when updating your bedroom. To ensure you get it right, we’ve put together a handy guide to show how big each bed size is and which is best for your circumstances. We include UK bed sizes and European bed sizes to clear up any confusion. Remember, it's also important to check the size of bed frames before buying as these will vary slightly depending on their design.

UK Bed & Mattress Sizes

Mattress Size (W x L)
Super king

6'0" x 6'6"

180 x 200

King

5'0" x 6'6"

150 x 200

Double

4'6" x 6'3"

135 x 190

Small double

4'0" x 6'3"

120 x 190

Single

3'0" x 6'3"

90 x 190

Small single

2'6" x 6'3"

75 x 190

Toddler

2'3" x 4'6"

70 x 140

Cot

23" x 47"

60 x 120

Mattress
Super king
King
Double
Small double
Single
Small single
Toddler
Cot
Size (cm) W x L

180 x 200

150 x 200

135 x 190

120 x 190

90 x 190

75 x 190

70 x 140

60 x 120

Size (feet) W x L

6'0" x 6'6"

5'0" x 6'6"

4'6" x 6'3"

4'0" x 6'3"

3'0" x 6'3"

2'6" x 6'3"

2'3" x 4'6"

23" x 47"

Choosing the right size mattress for your bed

You’ll need to ensure the length and width of your new mattress matches your frame or base. Which size bed and mattress is right for you depends on the room it's going in and how many people will be using it each night. Below we’ll explore the dimensions of each UK bed and mattress size plus advice for who each size is best suited.

What size is a super king bed and mattress?

Super king beds and mattresses dimensions are 180cm wide and 200cm long (6ft wide by 6ft 6in in length. This is the largest bed we have available, which is perfect for families who like to squeeze in for breakfast in bed, or those who just value a lot of space! Our super king mattresses are available in memory foam and pocket spring.

Best for: two people or more and those who like extra room.

Shop super king beds | Shop super king mattresses

What size is a king size bed and mattress?

In metric measurements, a standard king size bed and mattress is 150cm wide and 200cm long (5ft wide by 6ft 6in long). King size beds and longer than double beds, making them perfect if you’re a taller person who needs the extra leg room, or for couples looking for a spacious upgrade.

Best for: two people and those taller than 190cm/6ft 2ins

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What size is a double bed and mattress?

Double beds and mattresses are 135cm wide and 190cm long (4ft 6ins wide and 6ft 3ins long). As the most common size for a bed and mattress, doubles are ideal for two people and fit in most bedrooms. If you’re looking to maximise space in your bedroom, try a double ottoman bed for extra storage.

Best for: two people and small to average sized bedrooms.

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What size is a small double bed and mattress?

A small double bed and mattress is 120cm wide and 190cm long (4ft wide and 6ft 3ins long). Also known as a queen size bed, they are most suited to sleeping one person but can accommodate two adults if necessary. If your bedroom is smaller than average, small double beds are ideal, especially if you choose a divan or ottoman base which maximises storage space.

Best for: one person or couples with small bedrooms

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What size is a single bed and mattress?

Single beds and mattresses measure 90cm wide and 190cm long (3ft wide and 6ft 3ins long). As the name suggests, they’re ideal for one person and small bedrooms. They’re also great for children as they are cheaper, but still account for all growth spurts from roughly 4 years of age right through to teens.

Best for: one person

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What size is a small single bed and mattress?

Small single bed and mattresses dimensions are 75cm wide and 190cm long (2ft 6ins wide and 6ft 3ins long). Small singles are designed to fit narrower kids' bed frames and guest beds. They’re ideal for saving space and for spare rooms.

Best for: Children from roughly 4 years’ old, small rooms and guest beds

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What size is a toddler bed and mattress?

Toddler beds and mattresses are 70cm wide and 140cm long. (2ft 3ins wide and 4 feet 6 inches long). They’re ideal for kids aged roughly between 1 and 4 years, especially those who need a little help changing from a cot to a single bed. Take a look at our guide on how to choose your child’s first bed for more information on our range of toddler beds.

Best for: Toddlers and kids’ character beds

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What size is a cot mattress?

Cot mattresses are 60cm wide and 120 cm long (23ins wide by 47ins long). These mattresses are designed for babies who sleep in a cot and best for the sleep needs of babies from birth to 3 years old. They’re usually 10cm deep and are firmer than adult mattresses. This helps your baby’s development, ensuring their spine is aligned during sleep, helping them grow properly.

Best for: Babies and toddlers who haven’t yet moved into a bed

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Mattress size vs bed frame size

When buying a new bed, you’ll want to ensure it fits in your room comfortably, so you’ll need to know which bed frames tend to have larger dimensions. Most often, these are metal and wooden bed frames as the mattress sits within the frame rather than on top of a base. However, we do advise you to always check the dimensions on any product before making your purchase.

For more help on choosing the right bed, take a look at our guide to buying a bed. Kids’ beds have a recommended mattress size to fit the bed frame, whether that be toddler, single or Euro single.

Bed frame size according to style

The dimensions of your bed will differ depending on which style of bed frame you choose:

  • Divan beds without a headboard will have the same dimensions as your mattress as it will sit flush on top of the divan base.
  • Wooden bed frames are usually a few centimetres bigger than your mattress around each side.
  • Upholstered bed frame dimensions differ hugely depending on whether they have a sleigh shape, the amount of detail and the fabric.

Always check the dimensions of the bed before purchasing to ensure it fits in the room with enough space to move around the sides.

Euro Bed and Mattress Sizes

BED / MATTRESS SIZE EURO SINGLE (TWIN) EURO SMALL DOUBLE EURO DOUBLE EURO KING EURO SUPER KING
Width x Length (Metric) 90 x 200 120 x 200 140 x 200 160 x 200 180 x 200
Width x Length (Imperial) 3’0” x 6’6” 4’0” x 6’6” 4’7” x 6’6” 5’3” x 6’6” 6’0” x 6’6”

What size is a Euro single bed and mattress?

A standard European single bed, often known as a twin bed, is 90cm wide and 200cm long. (3ft wide and 6ft 6ins long). This means twin beds and mattresses are a little longer than their UK counterparts but the same width.

As a UK-based retailer, we don’t stock Euro beds or mattresses. However, you can shop our range of similar sized single beds and single mattresses.

We stock just a small range of Euro single mattresses for kids.

What size is a Euro small double bed and mattress?

A European small double bed and mattress is 120cm wide and 200cm long. (4ft wide by 6ft 6ins long). Like their UK equivalent, they’re ideal for couples who have small bedrooms, teenagers, and if you want more sleeping space than a single bed offers.

What size is a Euro double bed and mattress?

A European double bed and mattress measures 140cm wide and 200cm long. This is equal to 4 feet 6 inches wide and 6 feet 6 inches long. They’re the most common EU bed size, offering plenty of sleeping space without taking up too much room.

If you’re looking for a brand‐new bed and mattress, consider UK double instead. Shop our double beds and double mattresses which are just 10cm shorter than their EU counterpart.

What size is a Euro king size bed and mattress?

A European king size is bed 160cm wide and 200cm long. (5ft 2ins wide and 6ft 6ins long). This makes Euro king size, a little wider than its UK equivalent. If you’ve got the room, they offer a luxurious amount of space in which to sleep – ideal for couples who need extra room to sleep.

While we don’t sell EU king size beds and mattresses, we do sell a close equivalent. If you’ve not yet made up your mind, you should consider our king size beds and king size mattresses instead.

What size is a Euro super king size bed?

A Euro super king bed is 180cm wide and 200cm long (6ft wide and 6ft 6ins long). This makes them the same size as UK super kings which provide the largest sleep space available of all beds. This makes them perfect for couples who need maximum space and comfort.

Shop our super king beds and super king mattresses. These are the same size as EU super kings.