Doubling Your Money This calculator demonstrates the power of compound interest. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Share | Related Content The Power of Compound Interest Learn how to harness the power of compound interest for your investments. Countering Counterfeit Currency Combating counterfeiting remains core to preserving the integrity of the nation’s money. Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card.