based on Federal Employees Retirement System (FERS) FERS program Federal Employees Retirement System (FERS) FERS Information: Computation FERS FERS Information: Computation OPM FERS Annuity Estimates OPM OPM FERS Annuity Estimates FERS FERS Annuity FERS based on information on the agency’s website FERS Federal Employee Retirement System (FERS) FERS Information: Computation FERS program FERS