A defined-benefit pension promises a formula, not a balance: a percentage of your final average salary, earned per year of service. This calculator runs that formula with your numbers and shows the annual and monthly result. It's the estimate you need before you can answer the bigger question — how much of your retirement spending does the pension cover, and how much must your savings?
How your pension is calculated
Three numbers decide a traditional pension. Final average salary — usually your average pay over the highest-earning 3–5 consecutive years. The multiplier — the percentage of that salary you earn for each year of service, commonly 1.0–1.5%. Years of service — credited years in the plan, which is why pensions reward staying.
Multiply them together and you get the annual benefit, payable for life. If the result looks small, the levers are the ones you'd expect: the multiplier is fixed by your plan, but years of service and late-career earnings are yours to grow.
annual pension = finalAverageSalary × multiplierPct × yearsOfService
monthly pension = annual pension ÷ 12This is the core formula only. Real plans add options that change the number: survivor benefits (typically reducing the payment to fund a spouse's continuation), early-retirement reductions, and cost-of-living adjustments. Those are plan-specific — read the estimate as the pre-options base.
The sample, end to end. Your final average salary is $110,000, your plan's multiplier is 1.1% per year of service, and you have 25 years in. The formula: $110,000 × 1.1% × 25 = an annual pension of $$30,250, or $$2,521 a month, for life. Subtract that from your planned retirement spending — the retirement calculator will size what your savings must cover.
Terms & definitions
Defined-benefit plan
A pension promising a formula-based benefit for life, funded and managed by the employer — the opposite of a 401(k)-style defined-contribution plan.
Final average salary
The earnings base of the formula: usually the average of your highest-paid 3–5 consecutive years.
Benefit multiplier
The percentage of final average salary earned per year of service — commonly 1.0–1.5%.
Vesting
When you become entitled to the employer-funded benefit. Leave before vesting and the pension may be nothing.
Frequently asked questions
Is this for federal employees (FERS)?
No — FERS uses a different structure with its own rules (a 1.0% or 1.1% multiplier keyed to your high-3 average, depending on your age and service). Federal employees should use the dedicated FERS pension calculator.
Does this include Social Security?
No. Pension and Social Security are separate income streams, and many retirees draw both. Estimate Social Security at ssa.gov or with the social security calculator, then subtract both income streams from your spending in the retirement calculator to see your combined picture.
Will my pension adjust for inflation?
Plan-specific. Some public pensions pay a cost-of-living adjustment (COLA); many private pensions pay a fixed dollar amount for life. A fixed pension loses real value every year — over a 25-year retirement at 3% inflation, $30,000 buys about half what it did at retirement. Check your plan document.
Where do I find my multiplier and salary base?
Your plan document or summary plan description states both, and your HR department or pension administrator can confirm your credited years of service. The two phrases to look for are "final average salary" (and which years it averages) and "benefit multiplier" or "accrual rate."
References
- U.S. Department of Labor — private pension plan basics: dol.gov/agencies/ebsa/about-ebsa/our-activities/resource-center/faqs/retirement-plans
- IRS — pension and annuity income: irs.gov/retirement-plans/plan-participant-employee/retirement-topics-tax-on-pensions-and-annuities
- Social Security Administration — estimate your benefits: ssa.gov/benefits/retirement