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 The Latte Lie and Other Myths Do you know these three personal finance sayings? Mortgages in Retirement Explore the benefits and drawbacks to paying off your mortgage prior to retirement with this article. What Is My Current Cash Flow? Assess whether you are running “in the black” or “in the red” each month.