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 Question Thank you! Oops! Related Contents Once Upon a Goal Do you know how to set up your financial goals for success? This knight does. The Lowdown on Those Free Credit Scores What’s the deal with your yearly free credit report? Historical Inflation This calculator shows how inflation over the years has impacted purchasing power.