Abstract: The Dollar Coin Converter is an annular attachment to a United States dollar coin, which semi-permanently converts the coin into the same size and one-third the weight of a silver dollar. The converted coin is tactilely and visually, easily distinguished from the United States quarter coin. It provides advertising incentives to distributors to circulate the converted coin, and marketing incentives to the public to circulate it, saving billions of dollars. The Dollar Coin Converter is made of inexpensive, one-piece or two-piece construction. It holds a dollar coin securely, and will tolerate normal handling, such as cash transactions. The coin may be easily removed or replaced, if it is needed for a vending machine. The converted dollar coin retains the inherent magnetic and electrical, anti-counterfeiting characteristics of the dollar coin.