How Many Grams does a Penny Weigh?

It depends on when the penny was produced. United States pennies made before 1982 weigh about 3.1 grams. Pennies made since that time weigh about 2.5 grams. The weight difference is because of the materials used. Before 1982 pennies were 95 percent copper. Pennies made since 1982 are 97 percent zinc.