"According to the Bureau of Engraving and Printing, all U.S. bills weigh the same: one gram. About 454 grams make a pound, which means that a ton of dollar bills would be worth $908,000.

With coins, it is a different story. A quarter weighs 5.7 grams, according to the U.S. Mint; therefore, a ton of quarters would be worth $40,000. With pennies, it gets worse. You need 363,000 pennies (at 2.5 grams each) to make a ton, and the value of the pennies is a paltry $3,632."

https://www.michigan.gov/kids/0,4600,7-247-49025-34615--,00....