Retirement Calculator
Estimate how retirement savings may grow and whether you're on track for a retirement income goal.
Assumptions
Contributions grow with monthly compounding at the entered annual return. The projection assumes contributions continue steadily until retirement and does not model taxes on withdrawals.
Investment returns, inflation, taxes, and future expenses are uncertain. Results are hypothetical estimates and not financial or investment advice.
Methodology & sources
Every formula on this page is verified against the authoritative publications listed below. Assumptions describe the boundaries of the estimate.
Formulas
- Monthly compounding: B_{t+1} = B_t × (1 + r/12) + contribution
- Employer match added to monthly contribution as (income × match%) ÷ 12
- Real balance = Nominal balance ÷ (1 + inflation)^years
- Retirement income = Balance × safe withdrawal rate (default 4%)
Assumptions
- Constant return, contribution, and inflation across all years (real markets vary).
- Contributions are made at the end of each month.
- The 4% safe withdrawal rate follows Bengen's 1994 historical study of 30-year retirements.
- Tax treatment of withdrawals is not modeled.
Citations
- [1]Compound Interest Calculator — methodology — U.S. SEC Office of Investor Education (Investor.gov).Verified 2026-07-22.
- [2]Bengen WP. Determining Withdrawal Rates Using Historical Data. Journal of Financial Planning, October 1994. — Journal of Financial Planning.Verified 2026-07-22.
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This calculator provides estimates only. Results depend on the values entered and may not account for every individual situation. This site does not provide financial, tax, legal, investment, medical, or academic advice.