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. How Does Your Credit Score Compare? Have you ever wondered how your credit score compares to the rest of the country? Take a look and see. Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card.