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 Average American Budget Learn about the average American budget in this fun and interactive piece. Historical Inflation This calculator shows how inflation over the years has impacted purchasing power.