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? Spotting Credit Trouble The wise use of credit is a critical skill. These 10 questions will help you assess your skill level. Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card.