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How do I estimate the size of the Megalodon Shark by the tooth?

To measure a megalodon tooth, measure the diagonal length from the tip of the tooth to the corner of the root. The longer of the two diagonals is the tooth’s length.
You can estimate the size of the Megalodon tooth if you have a primary tooth ( one of the top teeth in the jaw which is for the most part symmetrical) It is about 1/8 of an inch for every foot. So to determine the size of a shark with a 7-inch tooth: There are eight 1/8’s of an inch in an inch. 8 X 7″ inches is 56 ft.