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 | Have A Question About This Topic? Address Thank you! Oops! Related Contents Surprise! You’ve Got Money! Here’s a quick guide to checking to see if you have unclaimed money. 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.