How tall is a man who is seven feet tall?

Seven feet in ancient times is about seven inches now, which is about 1 68 meters.

At first, the unit of measurement of a ruler refers to the distance between a man's thumb and middle finger, which is about 2 cm. Later, the standard of ruler changed.

In the long river of history, dynasties change, and the scales of each dynasty are different, and some even differ greatly, but the length of the "feet" of each dynasty basically keeps growing.