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 Keeping Up with the Joneses Lifestyle inflation can be the enemy of wealth building. What could happen if you invested instead of buying more stuff? 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.