Retirement Savings Calculator
Retirement Savings is evaluated from Current Age, Target Retirement Age and Current Retirement Savings. The calculation reports Projected Balance at Retirement, Inflation-Adjusted Value and Total Contributions.
Results
About the Retirement Savings Calculator
The calculator uses a custom php logic configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.
Formula basis:
Projected Balance = FV of existing savings + FV of monthly contributions
FV of existing savings = current_savings x (1 + r/12)^n
FV of contributions = monthly_contribution x [(1 + r/12)^n - 1] / (r/12)
- r = annual_return / 100
- n = years_to_retirement x 12
Inflation-Adjusted Balance = Projected Balance / (1 + inflation_rate/100)^years
Total Contributions = current_savings + monthly_contribution x n (months)
Investment Growth = Projected Balance - Total Contributions
Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.
Formula & How It Works
The calculation applies the following relations exactly as recorded in the metadata: Projected Balance = FV of existing savings + FV of monthly contributions FV of existing savings = current_savings x (1 + r/12)^n FV of contributions = monthly_contribution x [(1 + r/12)^n - 1] / (r/12) - r = annual_return / 100 - n = years_to_retirement x 12 Inflation-Adjusted Balance = Projected Balance / (1 + inflation_rate/100)^years Total Contributions = current_savings + monthly_contribution x n (months) Investment Growth = Projected Balance - Total Contributions Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.
Worked Examples
Example 1: 30-Year-Old Starting Early
Inputs
With Current Age = 30, Target Retirement Age = 65, Current Retirement Savings = 20,000 and Monthly Contribution = 800 as the stated inputs, the result is Projected Balance at Retirement = $1,440,844, Inflation-Adjusted Value = $512,052 and Total Contributions = $336,000. Each value corresponds to the declared output fields.
Example 2: 45-Year-Old Catching Up
Inputs
With Current Age = 45, Target Retirement Age = 67, Current Retirement Savings = 95,000 and Monthly Contribution = 1,500 as the stated inputs, the result is Projected Balance at Retirement = $936,968, Inflation-Adjusted Value = $488,997 and Total Contributions = $396,000. Each value corresponds to the declared output fields.
Example 3: Aggressive Saver — Early Retirement (55)
Inputs
With Current Age = 28, Target Retirement Age = 55, Current Retirement Savings = 30,000 and Monthly Contribution = 2,500 as the stated inputs, the result is Projected Balance at Retirement = $2,392,766, Inflation-Adjusted Value = $1,077,197 and Total Contributions = $810,000. Each value corresponds to the declared output fields.
Example 4: Late Starter — Age 50
Inputs
With Current Age = 50, Target Retirement Age = 67, Current Retirement Savings = 40,000 and Monthly Contribution = 2,000 as the stated inputs, the result is Projected Balance at Retirement = $780,252, Inflation-Adjusted Value = $472,066 and Total Contributions = $408,000. Each value corresponds to the declared output fields.
Common Use Cases
- Project your 401(k) or IRA balance at retirement
- See how changes in contribution rate affect retirement readiness
- Understand how inflation erodes retirement purchasing power