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. U.S. Personal Savings Rate What can be learned from the savings rate? Your Cash Flow Statement A presentation about managing money: using it, saving it, and even getting credit.