LIBERTY POST: Bed Mattress Size Chart: So handy to print off or save on file. I want a KING. What size do you have and what size would you like? I think my parents needed a bigger bed because I heard my Mother ask my Dad to 'move over' thousands of times! ~ "its very much important that you should know the size of your mattress, just like me..I had a problem in dealing with my mattress..