Measuring correctly?

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Hey guys this is my first post here , I don't mean to ask more silly questions like this one in the future so please don't hate . I was wondering why people who are 165 cm tall claim to be 5.5 feet , I really don't understand their calculations since  a foot = 12 inches , 1 inch = 2.54 cm so therefore 5.5 x 12 x 2.54 = 167.64  != 165.1. I have seen endless sites give different measurements , I believe 167.64 to be true but some say otherwise.

What do you guys think?

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Haha so true but lame measuring systems give you glowing hope    , ignorance is bliss ain't it ?

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Shucks I thought they all meant 5 feet 6 inches which is 5.5 foot lol sorry my bad , maybe I do suck at math xp.

P.s I don't mind people taking such sweet jabs it's cool , thanks for clarifying.

Peace out \m/