FERS Retirement Calculator

What the FERS retirement calculator does

This federal retirement calculator estimates your FERS retirement calculation using the same rules OPM applies: your High-3 average salary, your years of creditable civilian service, your unused sick leave balance, and your age at retirement relative to your Minimum Retirement Age (MRA). It’s built specifically as a retirement calculator fers employees can use before talking to HR — not a generic retirement calculator with FERS bolted on.

Unlike a private-sector 401(k) calculator, a federal employee retirement calculator has to account for things that don’t exist anywhere else: the MRA+10 age reduction, the FERS Special Retirement Supplement, special provision multipliers for law enforcement and firefighters, and sick leave credit. This tool handles all four.

How to calculate FERS retirement, step by step

If you want to know how to calculate FERS retirement by hand before trusting any calculator — including this one — here’s calculating FERS retirement in the same order the tool above uses:

1. Determine your High-3 — the average of your highest 3 consecutive years of basic pay, not your final salary.
2. Add up your creditable service — civilian service plus any unused sick leave, converted using the 2,087-hour divisor.
3. Check your eligibility — 62 with 5 years, 60 with 20 years, your MRA with 30 years (all unreduced), or your MRA with 10–29 years (MRA+10, reduced).
4. Apply the multiplier — 1%, or 1.1% if you’re 62+ with 20+ years of service.
5. Subtract any reductions — the MRA+10 age penalty and/or a survivor benefit election.

CSRS, GS employees, and civil service retirement

If you were hired before 1984, you’re likely under the older CSRS retirement calculator system (Civil Service Retirement System) rather than FERS — CSRS uses a different, tiered multiplier and doesn’t include Social Security or the FERS Supplement. This tool calculates FERS specifically; a dedicated civil service retirement calculator CSRS version is on our roadmap for legacy CSRS employees.

Your GS retirement calculator inputs are the same regardless of your General Schedule grade — whether you’re a GS employee retirement calculator user at GS-7 or a GS-13 retirement calculator user, your High-3 and years of service drive the math the same way. Grade only matters in that it determines your High-3 salary.

Federal and FERS disability retirement (medical retirement)

A FERS disability retirement calculator answers a different question than the standard tool above: disability retirement uses a separate formula for your first year (60% of your High-3, minus any Social Security disability benefit) and a reduced formula after. If you’re researching federal disability retirement — sometimes called medical retirement — because of a qualifying medical condition, the standard annuity estimate above will understate what you’re eligible for in year one.

USPS disability retirement and federal employee disability retirement follow the same FERS disability rules as any other agency — the Postal Service doesn’t have a separate disability system. How is FERS disability retirement calculated? Year one: 60% of High-3 minus 100% of any Social Security disability benefit. Year two onward: 40% of High-3 minus 60% of Social Security disability, until age 62, when it converts to a regular FERS annuity as though you’d worked to that point.

Sick leave credit: how unused hours become extra service

Every hour of unused sick leave adds to your annuity computation — it just doesn’t count toward eligibility. How to calculate unused sick leave for federal retirement: divide your total hours by 2,087 to get additional years. A FERS retirement sick leave calculator needs this step because most people who’ve spent 20+ years with an agency have several months — sometimes over a year — of unused sick leave sitting on the books.

Calculating sick leave for FERS retirement by hand is exactly what used to push people toward a FERS retirement calculator Excel spreadsheet — this tool does the same division automatically. A FERS retirement calculator with sick leave built in, like this one, means you don’t need a separate manual step: enter your hours, and the FERS retirement sick leave calculation happens as part of the total.

USPS and Postal Service employees

A postal retirement calculator is really just a FERS calculator — USPS employees hired after 1987 are FERS employees like any other federal agency staff, with one difference: many postal craft employees are covered by collective bargaining agreements that affect leave and pay tables, not the annuity formula itself. If you’re looking for a postal service retirement calculator or a post office retirement calculator, use the same High-3, years of service, and sick leave inputs above.

MRA+10, deferred, and early retirement

If you leave federal service before meeting an unreduced retirement age but have at least 5 years of service, you can leave your contributions in the system and claim a FERS deferred retirement calculator-style estimate later — payable starting at your MRA (reduced) or age 60/62 (unreduced), depending on your years of service. A FERS early retirement calculator scenario usually means MRA+10 (reduced, immediate) or, during a reduction in force, Voluntary Early Retirement Authority (VERA), which waives the usual age/service minimums.

The FERS Special Retirement Supplement

If you retire on an immediate, unreduced annuity before age 62, a FERS retirement supplement calculator — like the one built into this tool — estimates the bridge payment that approximates the Social Security benefit you earned during your FERS career. It’s formally called the FERS retirement annuity supplement calculator function above, and it stops the month you turn 62, whether or not you file for Social Security then. It’s subject to an earnings test if you work after retiring, similar to Social Security’s own rules.

Law enforcement, firefighter, and ATC (special provision) retirement

A federal law enforcement retirement calculator uses a different multiplier entirely: 1.7% of High-3 for your first 20 years, plus 1% for any years beyond that — noticeably richer than the standard 1%. Special provision employees (law enforcement officers, firefighters, and air traffic controllers) can retire at 50 with 20 years of covered service, or at any age with 25 years, always unreduced. Select “Special provision” in the calculator above to apply this formula.

TSP, employer contributions, and total federal benefits

A federal employee retirement benefits calculator covers more than the pension alone — FERS is a three-part system: this annuity, Social Security, and the Thrift Savings Plan (TSP). Unlike this pension formula, your TSP works like a retirement calculator with employer match: your agency automatically contributes 1% of salary and matches your own contributions up to an additional 4%, for up to 5% of salary in free money if you contribute at least 5% yourself. Use our TSP calculator (below) to project that piece separately.

This calculator follows the computation rules published by the U.S. Office of Personnel Management’s FERS Information page. Your agency’s official Retirement Services Estimate is the authoritative figure — use this tool for planning, not for your final retirement paperwork.