King size mattresses are not all the same dimensions. Like other kinds of mattress sizes, a “king” will vary. The standard king size measures 76” x 80”, but a king size mattress in the UK is roughly the same size as an American queen size mattress. Then there is the California King mattress which is 72” x 84”. In the UK there is also a “super king size” mattress, which measures about 72” x 78”.

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