Pension Benefit Estimator Formula

Understand the math behind the pension benefit estimator. Each variable explained with a worked example.

Use the Pension Benefit Estimator

Formulas Used

Annual Pension Benefit

annual_pension = years_of_service * benefit_multiplier / 100 * final_avg_salary

Monthly Pension

monthly_pension = years_of_service * benefit_multiplier / 100 * final_avg_salary / 12

Income Replacement Ratio

replacement_ratio = final_avg_salary > 0 ? years_of_service * benefit_multiplier : 0

Lump Sum Equivalent (Approx)

lump_sum_equiv = years_of_service * benefit_multiplier / 100 * final_avg_salary * 18

Variables

VariableDescriptionDefault
years_of_serviceYears of Service(years)25
final_avg_salaryFinal Average Salary(USD)85000
benefit_multiplierBenefit Multiplier(%)1.5
retirement_ageRetirement Age(years)62

How It Works

Pension Benefit Calculation

Standard Formula

Annual Pension = Years of Service x Multiplier x Final Average Salary

Common Multipliers

| Employer Type | Typical Multiplier | |---|---| | Federal FERS | 1.0-1.1% | | State/Local | 1.5-2.5% | | Military (20yr) | 2.5% | | Private Sector | 1.0-2.0% |

Final Average Salary

Usually the average of your highest 3-5 consecutive years of earnings. Some plans use career average instead.

Lump Sum Option

Some plans offer a lump sum payout. A rough equivalent is 15-20x the annual benefit.

Worked Example

25 years of service, $85,000 final average salary, 1.5% multiplier.

years_of_service = 25final_avg_salary = 85000benefit_multiplier = 1.5retirement_age = 62
  1. 01Annual pension = 25 x 1.5% x $85,000 = $31,875
  2. 02Monthly pension = $31,875 / 12 = $2,656
  3. 03Replacement ratio = 25 x 1.5% = 37.5%
  4. 04Lump sum equivalent = $31,875 x 18 = ~$573,750

Ready to run the numbers?

Open Pension Benefit Estimator