All nickels weigh 5 grams, or 2.5 grams more than the weight of post-1982 pennies, and 1.89 grams more than pre-1982 pennies. (1982 pennies exist in two weights.)
About 2 grams. A penny weighs in at 3.11 grams while a nickel weighs 5.0. Some older penny's weigh a little more, depending on when they were minted, due to the differences in material.
