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 Surprise! You’ve Got Money! Here’s a quick guide to checking to see if you have unclaimed money. What to Look for in Personal Finance Apps An increasing number have been developed to help individuals with their personal finances. What Is My Current Cash Flow? Assess whether you are running “in the black” or “in the red” each month.