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 Saving for College 101 Here’s a crash course on saving for college. Countering Counterfeit Currency Combating counterfeiting remains core to preserving the integrity of the nation’s money. What Is My Current Cash Flow? Assess whether you are running “in the black” or “in the red” each month.