King Size Mattress Dimensions

King size mattress dimensions are different for pretty much every country however for the UK, The King Size Mattress Dimensions are;

King Size Mattress Dimensions

5’ x 6’6”

150cm x 200cm


Is a King Size Mattress The Best Dimension for You?

Most people let the size of their room determine the size of their mattress, but in reality the recommendation is this ; Your mattress should be at least 10cm longer than the tallest person sleeping in it.

Your King Size Mattress Dimensions should also be wide enough for both partners to lie side by side with their hands behind their head without elbows touching. Sounds like a bit of an odd test, but it will ensure that you have enough space to get a relaxing night’s sleep without bashing into someone, rolling them (or being rolled!) out of bed or having your toes dangling out.

KIng Size Mattress Dimensions Compared to Other Dimensions

king size mattress dimensions

King Size Mattresses available in the UK and Ireland are manufactured using imperial dimensions but are generally sold in their approximate metric equivalents.





Small Single

2’6” x 6’3”

75cm x 190cm


3’ x 6’3”

90cm x 190cm

Small Double

4’ x 6’3”

120cm x 190cm


4’6” x 6’3”

135cm x 190cm

Euro Double

4’8” x 6’6”

140cm x 190cm


5’ x 6’6”

150cm x 200cm

King Zip & Link

2 x (2’6” x 6’6”)

2 x (75cm x 200cm)

Euro King

5’3” x 6’6”

160cm x 200cm

Super King

6’ x 6’6”

180cm x 200cm

Super King Zip & Link

2 x (3’ x 6’6”)

2 x (90cm x 200cm)


It is worth noting that there are no standardised King Size Bed Sizes in the UK. Any reference to ‘King Size Bed Dimensions’ will typically, unless specific to the bed frame dimensions, be referring to ‘King Size Mattress Dimensions’ as mattresses have a standard size grading.

These standard mattress sizes then correspond to their colloquial name as described above e.g. King Size Mattress Dimensions which is 5’ × 6’6″ or 150cm × 200cm. Mistakenly, the mattress size is often used as the required space for the full dimensions of the bed and mattress.

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