Pension Calculator
This pension calculator estimates the lifetime benefit a defined-benefit plan would pay you using the classic salary-times-service-times-multiplier formula that most government and corporate pensions rely on. Enter your final (or final-average) salary, the years you will have worked under the plan, and the per-year accrual multiplier your plan grants, and it returns the annual benefit, the equivalent monthly check, and a rough lump-sum equivalent. It is a quick way to see how each extra year of service or a richer multiplier changes the income you can expect in retirement.
Formula
Annual benefit = Final salary × Years of service × (Multiplier ÷ 100)
- Final salary
- Your ending or final-average annual salary in dollars
- Years of service
- Total credited years worked under the plan
- Multiplier
- Accrual percentage earned per year of service
- Monthly benefit
- Annual benefit ÷ 12; lump sum ≈ annual benefit × 15
How it works
- Type in your Final Salary in dollars and use the Years of Service slider (1-40 years) to set how long you will have contributed to the plan.
- Set the Benefit Multiplier slider (1%-3% in 0.1% steps) to the accrual rate your plan uses per year of service; many plans land near 1.5%-2.5%.
- Read the Monthly Benefit hero figure plus the Annual Benefit and an Estimated Lump Sum, which the tool approximates as 15 times the annual benefit. The Retirement Age slider is informational and does not change the accrual math.
Worked example
An employee retires with a $80,000 final salary, 25 years of service, and a 2% benefit multiplier.
- Annual benefit = 80,000 × 25 × (2 ÷ 100) = 80,000 × 25 × 0.02 = $40,000.
- Monthly benefit = 40,000 ÷ 12 = $3,333.33.
- Estimated lump sum = 40,000 × 15 = $600,000.
Annual benefit $40,000, about $3,333.33 per month, with a rough lump-sum equivalent near $600,000.
Frequently asked questions
- What is a benefit multiplier?
- The multiplier is the percentage of salary you earn toward your pension for each year of service. A 2% multiplier with 25 years of service replaces 50% of your final salary, so a higher multiplier or more years both raise the payout.
- How is the estimated lump sum calculated here?
- This tool approximates the lump sum as 15 times the annual benefit, a simple rule of thumb. A real plan computes the actuarial present value using your age, current interest rates, and life-expectancy tables, so treat this figure as a ballpark only.
- Does this account for cost-of-living adjustments or survivor options?
- No. The estimate assumes a flat single-life benefit. Annual COLA increases, joint-and-survivor reductions, early-retirement penalties, and Social Security integration are not modeled and would change your actual monthly check.
- What salary should I enter?
- Use the salary figure your plan bases benefits on. Many pensions use a final-average salary, typically the average of your highest three or five years, rather than a single final-year salary, so check your plan document.