How long is the worlds largest megalodon tooth?

The Megalodon was approximately 40 feet (12 metres) long, although fossil records show that they could often grow as large as 78 feet (18 metres). So if you were to stand the Megalodon on its nose it would be as tall as a six story building. I've heard this question many times, and to make it quick, the males were estimated of 70-120 ft. while the females were 80-140 ft. Here's a fact that effects the fish: the females are always bigger. about 40 ft

M ore like 50 ft