To use the tool, you simply plug in your birthday and highest annual work income to see your estimated benefit for each age, from 62 to 70. Click on the age you think you'd like to retire, and a new benefit amount pops up to show how your choice affects your check. You can also get more specific and detailed suggestions by answering questions about your marital status and financial particulars.

New online tool.  The Consumer Financial Protection Bureau's Planning for Retirement tool.