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? The Economic Journey of Your Morning Coffee Few contemplate the complex journey that brought their coffee from farm to kitchen table. Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card.