"...One of the important things all employees should do before retirement is request an annuity estimate. This is a calculation of your Civil Service Retirement System or Federal Employees Retirement System benefit prepared by your human resources office for a specific retirement date.
It's different from the do-it-yourself estimates that can be found on many automated payroll systems. And keep in mind, it's only an estimate. The Office of Personnel Management has final authority over your retirement computation..."
Read more at govexec.com
