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 Surprise! You’ve Got Money! Here’s a quick guide to checking to see if you have unclaimed money. Countering Counterfeit Currency Combating counterfeiting remains core to preserving the integrity of the nation’s money. Historical Inflation This calculator shows how inflation over the years has impacted purchasing power.