The single most important variable in retirement planning is not how much you save per month — it is when you start. This sounds like a cliché until you see the numbers. A 25-year-old saving $500/month at 7% return reaches $1.87 million by 65. A 35-year-old saving the same amount reaches $1.07 million. The 10-year delay costs $800,000 in final wealth despite identical contribution rates.
What this means in practice: starting today — not next month, not after the raise, not when you feel more financially stable — can realistically move your retirement date by 5-10 years. The calculator models this precisely for your specific numbers, not generic charts.
The framework is the 25x rule derived from the 4% safe withdrawal rate (Bengen 1994, Trinity Study): to retire sustainably, you need approximately 25 times your annual retirement expenses invested in a diversified portfolio. At a 4% withdrawal rate, that portfolio should sustain 30+ years of retirement with historically high probability.
The retirement date calculator applies this framework to your current age, savings, income, and monthly contribution to project exactly when you cross your target portfolio threshold — and how much earlier you cross it if you start today vs. waiting, or if you increase contributions by any specific amount.
Find My Retirement Date
Enter your age, current savings, and monthly contribution to see your exact retirement date, portfolio projection, and scenario comparison.
Find My Retirement Date- 1
Calculate your retirement target portfolio (the 25x number)
Multiply your expected annual retirement expenses by 25. If you plan to spend $55,000/year in retirement, your target is $1,375,000. This is the portfolio at which you can withdraw 4% annually and have historically strong probability of never running out of money over 30 years. Include Social Security income to reduce this target — if SSI covers $20,000/year, your portfolio only needs to cover $35,000, reducing the target to $875,000.
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Enter your current savings and today's monthly contribution
Your current savings balance is the foundation — it has the most compounding runway. Even modest current balances matter enormously. $25,000 saved at 30 with 7% return becomes $187,000 by 60 without any additional contributions. Enter what you can actually start contributing today, not what you aspire to contribute eventually.
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Run the start-today vs wait-one-year comparison
The calculator automatically shows you the retirement date if you start today versus if you wait one year to begin contributing. This single comparison — often a 1-2 year difference in retirement date for a seemingly small one-year delay — is the most motivating output in the tool. Print it, show it to your partner, and use it as the reason to open the 401k account today.
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Model the impact of increasing contributions by $200-$500/month
Small increases compound dramatically. The scenarios panel shows how adding $200, $500, or $1,000/month changes your retirement date. For most mid-career savers, adding $200/month moves the retirement date by 1-2 years. This is often achievable through a single lifestyle adjustment — removing a car payment, reducing dining out, or negotiating a small raise and directing it entirely to savings.
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Include Social Security and adjust withdrawal rate for your situation
Social Security income meaningfully reduces the required portfolio. Use the SSA's My Social Security portal to get your estimated benefit at different claiming ages. Claiming at 67 (full retirement age for most current workers) vs 62 provides roughly 43% more monthly income — and meaningfully changes both your required portfolio and your optimal retirement date.
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Stress-test with conservative return assumptions
The default 7% return is reasonable for a diversified equity-heavy portfolio over long periods. But check the 5% scenario as well — markets can underperform for extended periods. If your retirement date is still acceptable at 5%, your plan is robust. If 5% returns push retirement to an unacceptable age, you need either higher contributions or a later target date.
How much do I need to save per month to retire at 60?
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It depends entirely on your starting age and current savings. Starting at 30 with no current savings and targeting $1.5M (enough for $60,000/year spending at 4% withdrawal): you need approximately $1,200/month at 7% return. Starting at 35: approximately $1,800/month. Starting at 40: approximately $2,900/month. Each five-year delay roughly doubles the required monthly contribution to reach the same target at the same age.
What is the 4% rule and is it still valid?
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The 4% rule originated with Bill Bengen in 1994 and was tested by the Trinity Study: withdrawing 4% of your initial portfolio annually, adjusted for inflation, had a 95%+ success rate over 30-year retirement periods using historical US stock and bond returns. It remains a solid planning benchmark for 30-year retirements, though some researchers now recommend 3.5% for 40+ year retirements or in today's lower-yield environment.
Does the calculator account for inflation?
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The default return rate of 7% is approximately a nominal return, equivalent to about 5% real (after 2% inflation). The retirement expenses you enter should be in today's dollars — the calculator compounds your portfolio using the nominal rate but your target is sized in today's purchasing power. For explicit inflation modeling, use 9% nominal return with a 2% inflation adjustment on the withdrawal calculation.
What if I have a pension or other guaranteed income?
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Treat pension income the same way as Social Security: subtract it from your annual retirement expenses before calculating the 25x target. A $20,000/year pension reduces your required portfolio by $500,000. Enter this as part of your Social Security or other income estimate in the calculator. Defined benefit pensions are effectively guaranteed annuities and are the most valuable retirement assets most people have access to.
Should I prioritise retirement savings or paying off debt?
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The standard guidance: always capture employer 401k match first (it is a 50-100% instant return), then pay off high-interest debt (7%+ rate) before additional retirement investing, then maximise retirement accounts. The crossover point is roughly your expected investment return rate — debt above that rate should be paid first; debt below it can be carried while investing.
Calculate When You Can Retire
See your exact retirement date, the cost of waiting, and how much each additional $200/month of savings moves your retirement date.
Calculate When You Can Retire