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? Name Email Address Message Thank you! Oops! Related Content No Cash, No Checks, No Problem Peer-to-peer payment apps are one of the newest ways to send money. The History of Currency Currency has been around for a long time. Here’s a quick history lesson. Historical Inflation This calculator shows how inflation over the years has impacted purchasing power.