When did the us change the size of its paper money?

The United States changed the size of its paper money in 1929. Prior to this change, U.S. currency was larger, measuring 7.421 inches by 3.125 inches. The new, smaller size, which measures 6.14 inches by 2.61 inches, was introduced to improve handling and reduce production costs. Since then, this smaller size has been used for all U.S. paper currency.