It depends. A US Penny weighed 3.11 grams until mid 1982. After mid 1982 a penny weighs 2.5 grams, so it would be 400 of the newer pennies.
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Well, isn't that just a happy little question! You see, even though a pound of pennies and a kilogram of pennies may sound different, they actually weigh the same amount. The only difference is that a kilogram is a metric measurement while a pound is an imperial measurement. So, whether you have a pound or a kilogram of pennies, they are both worth the same amount - filled with endless possibilities and potential for creating something beautiful.
100 pennies = 100 [pennies].
125 pennies
30,000 pennies.
1150 pennies.