There are many countries that use pennies as their minor currency unit and these are of different size. Since you have not bothered to specify which country's currency you intended, it is not possible to give a more useful answer.
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15 centimeters
6 cm tall
7.5 cm
Six pennies (copper coated steel) equal 0,972 cm.
The average stack of 5 pennies is 7 mm tall.