In the United States, a penny weighs approximately 2.5 grams. To determine how many pennies make a pound in weight, we need to know that one pound is equal to 453.592 grams.
To find the number of pennies in a pound, divide the total grams in a pound by the weight of a single penny:
453.592 grams ÷ 2.5 grams/penny = 181.4368 pennies
Since you can’t have a fraction of a penny, we round down to the nearest whole number. Therefore, approximately 181 pennies make a pound in weight.