Table of Contents
- What Is FERS and Who Is It For?
- How to Use the FERS Retirement Calculator
- The FERS Annuity Formula
- When Are You Eligible to Retire Under FERS?
- Worked Example: A 30-Year Career on an $85,000 High-3
- What This Estimate Does Not Include
- How to Grow Your FERS Annuity
- FAQs
If you work for the US federal government, the pension-style payment you receive in retirement is called the FERS basic annuity, and its size is set by a short formula rather than by an account balance. This fers retirement calculator turns that formula into a quick estimate: enter your high-3 average salary, your years of creditable service and the age you plan to retire, and you get your estimated annual annuity, the monthly amount, and the share of your high-3 salary it replaces. As a result, knowing that number early makes every other retirement decision easier.
FERS Retirement Calculator
| Estimated annual annuity | |
| Estimated monthly amount | |
| Multiplier used | |
| Annuity as % of high-3 salary |
This tool estimates the basic FERS annuity only. It does not add cost-of-living adjustments, taxes, survivor-benefit reductions, the FERS supplement or unused sick-leave credit.
What Is FERS and Who Is It For?
FERS is the Federal Employees Retirement System, covering most US federal civilian employees. It has three parts that work together: the basic annuity calculated on this page, Social Security, and the Thrift Savings Plan (TSP), the workplace savings plan for federal staff. The US Office of Personnel Management (OPM) overview of FERS describes how the three parts fit together, and OPM administers the annuity itself.
The basic annuity is the predictable, pension-style layer of the three. Unlike the TSP, it does not rise and fall with the stock market, and unlike Social Security it is based only on your federal career: how long you served and what you earned near the end of it. That is why a fers retirement calculator only needs three inputs. To model the Social Security layer next, try our social security retirement calculator, and to combine all your income sources into one plan, use our general retirement calculator.
FERS covers the large majority of federal civilian employees. A few older employees remain under the older CSRS system, and special groups such as law enforcement officers and firefighters use different FERS formulas. This page covers the standard formula for most FERS employees.
How to Use the FERS Retirement Calculator
Enter three numbers into the fers retirement calculator at the top of this page. First, your high-3 average salary: the highest average basic pay you earned over any three consecutive years of service, explained in the next section. If still working, use your current salary as a stand-in.
Second, your years of creditable service, including part years: the tool accepts decimals, so 30.5 years works fine. Third, your age at retirement, because age decides which multiplier the formula uses. Press Calculate FERS Annuity and the tool shows your estimated annual annuity, the monthly amount, the multiplier it applied, and your annuity as a percentage of your high-3 salary. That last figure shows how much of your working income the annuity alone replaces.
The FERS Annuity Formula
The whole calculation rests on one formula, published on OPM’s FERS computation page:
Basic annuity = high-3 average salary × years of creditable service × multiplier
The multiplier is 1% in most cases. It rises to 1.1% only if you retire at age 62 or older with at least 20 years of service. That small difference is worth real money, as the worked example shows, because it applies to every year of service, not just the years after 62.
| Your situation at retirement | Multiplier |
|---|---|
| Under age 62, at any service length | 1% |
| Age 62 or older with less than 20 years of service | 1% |
| Age 62 or older with 20 or more years of service | 1.1% |
Your high-3 is the highest average basic pay you earned during any three consecutive years of service. For most people those are the final three years, but an earlier period counts if basic pay was higher then. Basic pay means the salary for your position, including increases on which retirement deductions were withheld, such as shift rates. It excludes overtime and bonuses, so your high-3 is usually a little lower than your best total earnings. For length of service, OPM adds up all your creditable service and drops any leftover fraction of a month.
So each year of service adds 1% of your high-3 to your annuity, or 1.1% at the higher multiplier: thirty years replaces 30% of your high-3 salary, or 33% at 1.1%. This is the arithmetic our fers retirement calculator runs for you, so check both multipliers if you are near 62 with 20 years of service.
When Are You Eligible to Retire Under FERS?
A correct estimate only helps if you can actually retire at the age you enter. Under FERS, eligibility depends on your age and years of creditable service. OPM’s FERS eligibility page lists the combinations that give an immediate benefit:
| Retirement path | Age required | Years of service |
|---|---|---|
| Full annuity at your MRA | Minimum Retirement Age | 30 |
| Full annuity at 60 | 60 | 20 |
| Full annuity at 62 | 62 | 5 |
| MRA+10 early retirement | Minimum Retirement Age | 10 or more |
Your Minimum Retirement Age (MRA) depends on your year of birth: 55 for employees born before 1948, rising in steps to 57 for anyone born in 1970 or later, with 56 for those born from 1953 to 1964.
The fourth path, retiring at your MRA with at least 10 years of service, is called MRA+10, and it comes with a catch: the annuity is reduced by 5% for each year you are under age 62 when it starts, so retiring five years early loses 25%. The reduction does not apply if you have at least 20 years of service and your annuity starts at age 60 or later, and postponing the start date shrinks it too. Our fers retirement calculator does not apply the MRA+10 reduction, so on that path treat the estimate as the unreduced amount and factor the cut in yourself.
Worked Example: A 30-Year Career on an $85,000 High-3
Take a federal employee with a high-3 of $85,000 and 30 years of creditable service, and watch what the retirement age does.
Retiring at age 62. The 1.1% multiplier applies. One year of service is worth 1.1% of $85,000, which is $935. Multiply by 30 years: $935 × 30 = $28,050.00 per year. Divided by 12, that is $2,337.50 per month, replacing 33.0% of the high-3 salary.
Retiring at age 60. Same service and salary, but the multiplier is 1%. One year of service is worth 1% of $85,000, which is $850. Multiply by 30: $850 × 30 = $25,500.00 per year, or $2,125.00 per month, replacing 30.0% of the high-3 salary.
Waiting from 60 to 62 is worth $2,550 a year, every year, for life, before any pay rises in those two years are counted. Run both ages through the fers retirement calculator above and you will see the same figures. The table below holds the age at 62 and varies service length on the same $85,000 high-3.
| Years of service (retiring at 62) | Annual annuity | Monthly amount |
|---|---|---|
| 20 | $18,700.00 | $1,558.33 |
| 25 | $23,375.00 | $1,947.92 |
| 30 | $28,050.00 | $2,337.50 |
| 35 | $32,725.00 | $2,727.08 |
| 40 | $37,400.00 | $3,116.67 |
What This Estimate Does Not Include
Be clear about what the number from this fers retirement calculator is: an estimate of the basic annuity only, worked out with the standard OPM formula. Several real-world adjustments sit outside it. The tool does not add cost-of-living adjustments (COLA), which for most FERS retirees only begin at age 62, so it shows your starting annuity, not a future inflated value. It does not deduct taxes, and the annuity is taxable income.
It also does not apply the survivor-benefit reduction: elect a survivor annuity for your spouse and OPM cuts your own annuity, by 10% for a 50% survivor benefit. In addition, it excludes the FERS supplement, the extra payment some retirees receive before Social Security starts, and credit for unused sick leave, which in a real OPM calculation can lengthen service slightly. Nor does it apply the MRA+10 reduction. For an official figure, your agency’s HR office and OPM decide from your actual service record.
How to Grow Your FERS Annuity
Because the formula has only three levers, growing the annuity means moving one of them. The first is service: every extra year adds another 1% or 1.1% of your high-3, and your high-3 usually rises at the same time, so the last years of a career pull double duty. Next, the high-3 itself: late promotions and grade or step increases lift the average across your best three years.
The third lever is timing. Reaching age 62 with at least 20 years switches on the 1.1% multiplier for your whole career, and delaying an MRA+10 start shrinks the 5%-per-year reduction. Around the annuity, the TSP is where federal employees build the rest of their income: the annuity replaces roughly a third of salary after a long career, so the TSP and Social Security carry the remainder. To compare a savings-led approach instead, the dave ramsey retirement calculator shows what a target nest egg looks like without a pension.
FAQs
How is the FERS basic annuity calculated?
Multiply your high-3 average salary by your years of creditable service, then by 1%. The multiplier becomes 1.1% if you retire at age 62 or older with at least 20 years of service: $85,000 × 30 years × 1.1% gives $28,050.00 a year.
What is the high-3 average salary?
It is the highest average basic pay you earned during any three consecutive years of service, usually your final three years. Basic pay is the salary for your position, including increases on which retirement deductions were withheld. Overtime and bonuses do not count.
When do I get the 1.1% multiplier instead of 1%?
Only when both conditions are met: you retire at age 62 or older, with at least 20 years of creditable service. Retire at 61 with 25 years, or at 62 with 19 years, and the multiplier stays at 1% throughout.
What is the Minimum Retirement Age under FERS?
The Minimum Retirement Age (MRA) is the earliest age at which you can retire with the required service. It depends on your birth year: 55 if born before 1948, rising in steps through 56 for those born from 1953 to 1964, up to 57 for anyone born in 1970 or later.
How big is the MRA+10 reduction if I retire early?
If you retire at your MRA with at least 10 but fewer than 30 years of service, your annuity falls by 5% for each year you are under 62 when payments start. Retiring at 57 means a 25% reduction, unless you have 20 years of service and payments start at 60 or later.
Does this calculator include COLA, taxes or the FERS supplement?
No. This fers retirement calculator estimates the basic annuity only. It leaves out cost-of-living adjustments, tax deductions, the survivor-benefit reduction, the FERS supplement and sick-leave credit, so treat it as a starting figure, not a final take-home amount.
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