Updated May 2026 · Defined Benefit Formula · No Account Needed

See Exactly How Much Your Pension Pays

Enter your final average salary, years of service, and plan multiplier to estimate your monthly defined benefit pension — annual benefit, lifetime value, and income replacement in seconds.

No Signup Runs in Browser Standard DB Formula Updated for 2026
Defined Benefit Formula · FERS/CSRS Aligned · 2026 COLA: 2.5% · Used by Public Employees Nationwide

Monthly Pension Benefit Calculator

Adjust any input — results update live. All calculations run in your browser.

Highest 3–5 year average (High-3 for FERS)
Total creditable service years
FERS: 1.0% · State avg: 1.5% · CSRS: ~2.0%
Used to estimate lifetime pension value
Federal FERS COLA is 2.5% for 2026
Joint options protect a surviving spouse
Add SS to see combined retirement income
Leave 0 if not retiring early
Estimated Monthly Benefit
$2,344
Based on 25 years · $75,000 salary · 1.5% multiplier
Annual Benefit
$28,125
Lifetime Value
$703,125
Income Replacement
37.5%
Income Replacement vs 70% Goal 37.5% of pre-retirement income
Shortfall — Pension alone covers under 50% of income
Link copied!

Lifetime Pension Value

How much your pension is worth from retirement to age 85 — with and without COLA.

No COLA
—
0% annual growth
With 2.5% COLA
—
2026 FERS/SS rate
With 3% COLA
—
State plan max

Based on inputs from Monthly Benefit tab. Lifetime = age 62 to 85 (23 years in retirement).

COLA compounds the value of your pension significantly over a long retirement. At 2.5% COLA, every $1,000/month in initial benefits becomes worth approximately $1,600/month after 20 years in nominal terms — and the lifetime value grows accordingly. Most public plans cap COLA between 2–3%. Private-sector pensions rarely include any COLA, meaning their real value erodes roughly 40% over 20 years at typical inflation rates.

Pension vs 401(k) Income Comparison

Same salary and years drive both estimates. Adjust 401(k) contribution rate below.

Employee + employer total contribution
Historical S&P 500 average: ~7% real

Defined Benefit Pension

Monthly benefit—
Annual income—
Guaranteed for lifeYes
Income replacement—

401(k) at 4% Safe Withdrawal

Projected balance—
Monthly income (4% SWR)—
Guaranteed for lifeNo
Income replacement—
Run inputs in the Monthly Benefit tab first.

401(k) projection assumes contributions grow at the specified annual return for the full years-of-service period. The 4% safe withdrawal rate is a widely used retirement planning rule. Actual outcomes vary. Full comparison tool →

2026 COLA Rates:
FERS: 2.5% CSRS: 2.5% Social Security: 2.5% CalPERS: up to 3%
$2,400
Avg monthly public pension benefit
86%
Public sector workers with DB plan coverage
27 yrs
Avg years of service at retirement (DB plans)
62
Avg retirement age for defined benefit plan holders
How it works

Three Steps to Your Pension Estimate

1
Enter Your Salary & Service Years
Input your final average salary (High-3 or High-5) and total creditable service years. These two figures drive the majority of your benefit calculation.
2
Set Your Plan Multiplier & Options
Enter your plan's benefit multiplier from your Summary Plan Description, choose a survivor option, and add any COLA rate or early retirement reduction.
3
See Your Monthly Benefit & Lifetime Value
Instantly see your estimated monthly pension, annual benefit, income replacement percentage, and total lifetime value. Compare against 401(k) income on the third tab.

The Defined Benefit Formula Explained

A defined benefit pension is calculated using one core formula. Every public and most private DB plans use a version of it:

Monthly Benefit = (Years of Service × Multiplier% × Final Average Salary) ÷ 12 Example: (25 × 1.5% × $75,000) ÷ 12 = $2,344/month

Your final average salary is typically the average of your three highest consecutive earning years (High-3 in federal plans) or five years in some state plans. Your benefit multiplier is the accrual rate in your plan's Summary Plan Description — usually between 1.0% and 2.5%. Years of service counts all creditable time, including sick leave in many plans.

What Affects Your Pension Benefit

Three factors move your benefit most: the multiplier, the salary average method, and total service years. A move from 1.0% to 2.0% multiplier doubles your benefit — more impactful than any salary increase. The difference between a High-3 and career-average salary calculation can be tens of thousands of dollars over a career. For federal employees, the choice between FERS and CSRS (for those with grandfathered status) changes the effective multiplier from 1.0% to roughly 2.0%.

Discover how service length specifically affects your benefit at our pension by years of service guide, or see federal-specific rules at our federal pension calculator.

COLA and Survivor Benefits

Cost-of-living adjustments are the most underestimated component of pension value. A $2,500/month pension with 2.5% annual COLA grows to approximately $4,000/month after 20 years in retirement — a 60% nominal increase. Without COLA, that same check buys 40% less real purchasing power after 20 years at average inflation. Federal FERS pensions receive a partial COLA (currently 2.5% for 2026). Most state and local plans also cap COLA at 2–3%. Private-sector pensions rarely include automatic COLA.

Survivor benefit elections reduce your monthly check — typically 11% for a 50% joint-life option — but guarantee your spouse income for life. Many couples find the cost of a joint-life option is lower than comparable life insurance coverage. Model your specific numbers with our COLA calculator.

Pension vs 401(k): Which Builds More Retirement Income?

For public sector workers at full career service (25–35 years), defined benefit pensions consistently outperform equivalent 401(k) contribution rates on guaranteed lifetime income. The pension's advantage compounds with longevity — the longer you live, the more the guaranteed monthly benefit outpaces a fixed-balance savings account depleted by withdrawals. Private-sector workers who have both a pension and a 401(k) should model both using the Benefit vs 401(k) tab above. See the full comparison at Pension vs 401(k).

Specialty tools

Every Calculator You Need

🏛
Federal Pension Calculator
FERS, CSRS, and CSRS Offset — with High-3 salary, FERS Supplement, and Survivor Benefit Plan options.
→ Use Calculator
🎓
Teacher Pension Calculator
State-by-state TRS plan details, early retirement penalty, WEP/GPO impact for non-SS-covered teachers.
→ Use Calculator
📈
COLA Calculator
See nominal vs real (inflation-adjusted) pension value year by year. Includes purchasing power decay chart.
→ Use Calculator
💰
Lump Sum vs Monthly
Break-even age, NPV comparison, and decision matrix across health, heirs, and investment confidence scenarios.
→ Use Calculator
⚖
Pension vs 401(k)
Side-by-side lifetime income comparison. Same salary and service inputs drive both estimates simultaneously.
→ Use Calculator
⏱
Early Retirement Penalty
Calculate the cost of retiring 1, 3, or 5 years early. Break-even analysis and eligibility checker included.
→ Use Calculator
Common questions

Pension Calculator FAQs — 2026

Most defined benefit pensions use: Years of Service × Benefit Multiplier × Final Average Salary. With 25 years, a 1.5% multiplier, and $75,000 final average salary: 25 × 1.5% × $75,000 = $28,125/year, or $2,344/month. Your plan's multiplier is in your Summary Plan Description (SPD). Final average salary is typically the average of your highest 3 or 5 consecutive earning years — check your plan for which method applies.
Financial planners target 70–80% income replacement in retirement from all sources combined. A pension that replaces 50–60% of salary — achievable with 30+ years at a 1.5–2.0% multiplier — is considered strong. The average public-sector pension pays approximately $2,400/month. Social Security adds an average $1,907/month (2026 SSA data) for those who qualify, making combined income well above the 70% threshold for many career public employees.
Single life pays the maximum monthly benefit for your lifetime only — stops at death, leaving nothing to a spouse. Joint and survivor (J&S) options pay a reduced benefit while both spouses are alive, then continue paying the survivor a percentage (50%, 75%, or 100%) after your death. A 50% J&S option typically reduces your monthly benefit by 10–15%. Federal law requires your plan to default to a Joint & 50% Survivor Annuity if you're married — you need written spousal consent to waive it.
Many plans offer a lump-sum buyout, but not all. The key metric is the break-even age: divide the lump sum by the additional annual monthly payments you'd forgo. If you expect to live past that break-even age (typically the late 70s to early 80s), monthly payments usually produce more total income. The lump sum can make sense if you're in poor health, have no dependents to protect, or have strong investment experience. Use our lump sum calculator to compare scenarios.
Normal retirement age varies by plan. Most public-sector plans set normal retirement at age 65 or a "rule of 80" (age + years = 80). Federal FERS employees reach their Minimum Retirement Age (MRA) between 55 and 57 depending on birth year. Early retirement is usually available at 55 with 10 years, but benefits are reduced 3–6% per year before normal retirement age. Some public safety plans (police, fire) allow full retirement at 50 with 25 years. See our early retirement calculator to model reductions.
The multiplier (also called accrual rate) is the percentage of average salary credited per year of service. Most state and local pensions use 1.5%–2.5%. Federal FERS uses 1% (1.1% at age 62 with 20+ years). CSRS uses a tiered formula averaging ~2%. Over 30 years, a 2.5% multiplier yields 75% income replacement vs 45% at 1.5% — a massive difference. Your exact multiplier is in your plan's Summary Plan Description, which your employer is required to provide.
Yes, in most cases. Benefits funded with pre-tax contributions are fully taxable as ordinary income. If you made after-tax contributions, a portion may be tax-free under the IRS Simplified Method. State treatment varies significantly — Illinois, Pennsylvania, Mississippi, and Alabama exempt most pension income, while others tax it at the full state rate. Military pensions receive special treatment in many states. Consult a CPA for your specific tax situation.
COLA (cost-of-living adjustment) is an annual increase that offsets inflation. Federal CSRS pensions receive the full CPI-W COLA annually. FERS pensions receive partial COLAs — in 2026, the FERS COLA is 2.5%. Most state and local plans also include COLA provisions capped at 2–3%. Most private-sector pensions have no automatic COLA, meaning purchasing power falls roughly 40–45% over 25 years at average inflation rates. Use our COLA calculator for a year-by-year projection.
Methodology & Data Sources
Annual Benefit = Years of Service × Benefit Multiplier (%) × Final Average Salary × Payout Factor × (1 − Early Reduction%) Monthly Benefit = Annual Benefit ÷ 12 Lifetime Value = Monthly Benefit × 12 × (85 − Retirement Age) Income Replacement = Annual Benefit ÷ Final Average Salary × 100

Sources: OPM (FERS/CSRS multiplier rules, COLA rates) · BLS National Compensation Survey (salary medians, DB plan coverage) · SSA actuarial tables (life expectancy) · SSA.gov (Social Security average benefit, WEP/GPO rules) · IRS (tax treatment of pension benefits) · GFOA actuarial standards · CalPERS, NYSLRS, TRS plan documents (state plan multipliers). All figures are estimates. Actual benefits are determined by your plan administrator.