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 What Our Kids Can Teach us About Saving Money Would you guess that Millennials are effectively saving for retirement? Well, they are. U.S. Personal Savings Rate What can be learned from the savings rate? Historical Inflation This calculator shows how inflation over the years has impacted purchasing power.