how do you correctly measure sitting height?

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Ok I don't know what I am doing but every time I measure my sitting height it comes out anywhere from 82.2 CM to a solid 87 cm. I am not exactly sure what I am doing. I tried sitting on the floor with my legs out, then I tried sitting on the floor with my legs crossed(gave me a solid inch), then I tried sitting down on a table against the wall and it came out at 87 cm.


What is the best way. I am 170.18 cm now(yay I am not in the 5 feet 6 range at all anymore).


I am just wondering.

Edit Post

Wait but my Belly Button is very low to the ground at 103.2 cm. Also I am 170 cm tall. So my torso is considered long then?