Saving for College This calculator can help you estimate how much you should be saving for college. 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 Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. The Utility of Sector Investing Successful sector investing is dependent upon an accurate analysis about when to rotate in and out. Keys to Investing for Retirement There are some key concepts to understand when investing for retirement.