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 The Latte Lie and Other Myths Do you know these three personal finance sayings? A Penny Saved is Two Pennies Earned Here are some simple and inexpensive energy-saving tips that may help you save money. What Is My Current Cash Flow? Assess whether you are running “in the black” or “in the red” each month.