Modern pennies are 2.5 grams in weight each, assuming that the subject is the United States penny. A penny is worth 1 cent So 2.5 x 1,000,000 = 2,500,000 grams. Now, 2.5 million grams would be the answer if each penny was worth $1, but it is worth $0.01, so then multiply 2,500,000 by 100 and you get 250,000,000 grams. read more