Below are online tools that will allow you to answer these questions and more in a very personalized way.
American Savings Education Council's Ballpark Estimate
The Ballpark Estimate, produced by the American Savings Education Council, helps you quickly identify approximately how much you need to save to fund a comfortable retirement by taking projected Social Security benefits and earnings assumptions on savings.
U.S. Government Calculator
The Social Security Administration calculators are designed to help you explore your potential benefit amounts using different retirement dates and different levels of potential future earnings.