Updates automatically as you type.
Calculated in your browser; your inputs are not sent to us. Privacy
Calculation details
Planning estimate only, not financial, tax, or legal advice. Verify assumptions and current rules before making decisions.
This tool runs in your browser. Your calculator inputs and results are never transmitted to us or to ad/affiliate partners. Ads and sponsored links may set third-party cookies to serve and measure them, but they never receive your calculation values. If you explicitly save a scenario, its permitted fields stay in local browser storage until you clear them. See our Privacy Policy.
Use this result
Share the current inputs or ask ChatGPT to explain the calculation in context.
More options
What does this calculator estimate?
This calculator projects your retirement savings month by month, applying compound growth to your current balance and monthly contributions at your assumed annual return. It also shows the real value of that future balance after adjusting for inflation, so you can see your purchasing power in today's dollars. Use the result to compare your projected real balance against your target retirement number, then adjust your contribution rate or retirement age to close any gap. All calculations run entirely in your browser, so your financial details never leave your device.
How much of my income should replace itself in retirement?
Conventional planning uses 70-85% of pre-retirement income, but the right number depends on what disappears: payroll taxes, retirement contributions, and commuting often end, while healthcare can rise. The useful exercise is listing which expenses actually stop and which start. A replacement ratio is a starting sketch, not a verdict on your specific retirement.
What withdrawal rate is safe to plan around?
The widely cited 4% guideline comes from historical sequence-of-returns studies and assumes a mixed portfolio over a roughly 30-year retirement. Early retirement, higher expected longevity, or a conservative portfolio all argue for a lower initial rate. Treat the percentage as a research benchmark to adjust, not as a guarantee; revisit it every few years against actual balances.
How this calculator works
Formula
Each month: balance = prior balance × (1 + annual return ÷ 12) + contribution; real value discounts the result by inflation.
Sources
- Investor.gov — Compound interest calculator and investor education
- Department of Labor — Taking the mystery out of retirement planning
Sources support the method, terminology, or planning context. Editable assumptions remain your responsibility.
Assumptions to verify
- Returns, inflation, and contributions remain constant.
- Contributions are made at month-end and taxes/fees are excluded.
- The withdrawal rate is a planning input, not a guarantee that savings will last.
Frequently asked questions
How does this retirement calculator work?
This retirement calculator runs entirely in your browser — it uses your inputs like age, savings, and expected contributions to project your retirement readiness using standard compound growth formulas. No data is sent to a server.
Is my personal information safe and private?
Yes. This retirement calculator requires no signup or account creation. All calculations happen locally on your device, and nothing — not your age, income, or savings — is stored, shared, or transmitted anywhere.
How accurate are the results from this retirement calculator?
The retirement calculator provides estimates based on the assumptions you enter, such as your retirement age, expected returns, and inflation rate. It is a planning tool, not a financial advisor, and actual results may vary based on market conditions and lifestyle changes.
Cite this tool
BoringToolsKit. “Retirement Planning Calculator.” boringtoolskit.com/retirement-planning-calculator/ (reviewed August 2026). Free to reference in articles, syllabi, and answer posts with a link.
Privacy: Inputs and results stay in this browser. Results are planning estimates based on your inputs; verify assumptions and current rules before making decisions.