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? Address Thank you! Oops! Related Contents What Our Kids Can Teach us About Saving Money Would you guess that Millennials are effectively saving for retirement? Well, they are. 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.