Estimate pension benefits based on years of service, final average salary, and benefit formula with lump-sum versus annuity comparison.
Pensions are formula math: years of service times a plan multiplier times your final average salary. This calculator takes those three inputs, applies the benefit formula you specify, and shows the resulting annual and monthly pension alongside a lump-sum versus annuity comparison. The thing users most often miss is that both inputs and outputs are assumptions: your real plan may integrate with Social Security, reduce benefits for retiring early, or use a different salary definition, and the lump-sum comparison swings with the interest-rate and life-expectancy assumptions behind it.
A concrete input and expected output from the current implementation.
Input
Benefit multiplier 1.5% per year of service; 25 years of service; final average salary $60,000; lump-sum offer $250,000
Expected output
Estimated pension: $22,500 per year, $1,875 per month.
The formula multiplies 1.5% by 25 years, or 37.5%, by the $60,000 final average salary, giving $22,500 a year, or $1,875 a month. For the lump-sum side, arithmetic alone: $250,000 divided by $1,875 is about 133 months, so the annuity and lump sum break even near 11 years of payments; whether that favors the lump sum depends on the discount-rate and life-expectancy assumptions used for the comparison.
Pension equals a multiplier times years of credited service times final average salary. The multiplier is plan-specific, commonly 1% to 2% per year, and final average salary usually means the average of your highest three or five consecutive years, not your last-year pay. Because the tool lets you set the multiplier, it can model different plans' formulas rather than a single built-in rule.
Once the annual pension is computed, the comparison treats the annuity as a stream of future payments and asks what it is worth today. Present value moves inversely with the discount rate: a higher assumed interest rate makes the annuity worth less now, so the same lump-sum offer looks better. A different rate or assumed lifespan can flip the recommendation, so treat the result as an assumption-dependent judgment, not a verdict.
No. A lump sum is a present value: money paid now is worth more than the same money spread over decades, so the plan discounts future payments using an assumed interest rate. The quoted lump sum is therefore smaller than the nominal sum of expected payments, and it grows larger when assumed rates fall. The gap is the cost of having the money today.
No, not by itself. It applies the generic formula you enter; your plan may integrate with Social Security, use a different salary definition, reduce for early retirement, or add cost-of-living increases. Use it to compare scenarios, then confirm the figure with your plan administrator's official benefit statement before making a decision based on it.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
Calculate gross, operating, and net profit margins from cost and revenue with breakeven analysis.
Convert between annual salary and hourly rate with adjustments for work hours, overtime, and benefits.
Calculate sales tax amounts, tax-inclusive and tax-exclusive prices for any tax rate or jurisdiction.
Calculate return on investment from initial cost and final value with annualized ROI and comparison tables.
Convert between markup and margin percentages, calculate selling price, and compare pricing strategies.
Convert numeric amounts to written words for invoices, checks, and legal documents in multiple currencies.