Megalodon was a species of giant shark that was closely related to the Great White Shark but it was 50 feet long and weighed 50 tons. So how do we know how big Megalodon was? We can tell how big Megalodon was for every inch of tooth equals 10 feet. The biggest teeth recorded are 7 inches long. A 7 inch tooth means a 70 foot long Megalodon. At h
ome, I have 4 to 5 inch tooth which means it came from a shark about 40 to 50 feet in length.