If my great-great-grandmother is 100% Native-American, does that make me 1/16 Native American?

Anonymous
I know that GAG is a girl-ask-guy and vice versa related website, but I'm not on any other Q&A website and figured I might as well ask this question on here :)

My maternal grandfather's deceased grandmother was 100% Native American. She married and had her kids with a black man. My maternal grandmother had an uncle who was 100% Native American, as well.

Other than that, the details I have about just how extensive my Native American history is is vague. Both my mother and father have Native American relatives but I don't know any details about my father's ancestry. I do know that there are quite a few Native Americans on both my maternal grandmother and grandfather's side, but the two mentioned above are the main ones they talk about/have actually given me details about.

I would like to learn more about my Native American ancestry and am going to start asking my grandparents and father for more information about it, but for now, this is the only information I can give you.

I ask this question because I was looking up how to calculate your Native American percentage online, and came across a website that said if your great-great-grandparent is 100% Native American, that makes you 1/16 Native American. Is that true?
Updates
+1 y
Also, if any of you have Native American ancestry, how did you go about learning more about your Native American roots?
If my great-great-grandmother is 100% Native-American, does that make me 1/16 Native American?
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