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 Power of Compound Interest Learn how to harness the power of compound interest for your investments. 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.