Hello Dexter , the measurement on our Standard King Mattress size is 76" x 80 " , the Split King Mattress size would be Two Mattresses at 38"x80" .We have Split King on our showroom floor in Fort Worth if you would like to come by and see them first hand .
Standard King mattress measures 80″ x 80″ and the Split King Mattress is actually 2 twin mattresses that measure 80″ x 38″ each.
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