How tall is a stack of 100 pennies in centimeters

A stack of 100 pennies, one on top of the other, is 15.5 centimeters tall.

According to the US Mint, a penny is 1.55 mm thick, therefore a stack of

100 pennies would be 155 mm thick or 15.5 centimeters.

This means that a stack of 100 pennies is 6.1 inches in height.

15.5 cm and 6.1 inches in height.