Retirement Calculator
Project your retirement portfolio, calculate monthly income using the 4% rule, and see exactly when you'll hit key milestones.
Parameters
Plan your retirement
Retirement income coverage at age 65
Portfolio at Retirement
$ 0Monthly Income (4% rule)
$ 099% covered — gap $39/month
Years to Retire
0 yrsAnnual Income
$ 0Interest Earned
$ 0Portfolio Lasts
0 yrsPortfolio Milestones
$250K
Age 45
$500K
Age 53
$1.00M
Age 62
Retirement Growth Chart
Portfolio growth from age 30 to 65
Results are for informational purposes only and do not constitute financial advice. Actual returns may vary due to market conditions, taxes, and fees. Read our full disclaimer.
What is Retirement Planning?
Retirement planning is the process of determining how much money you need to stop working and sustain your desired lifestyle indefinitely — and then building a systematic strategy to accumulate that amount. At its core, retirement planning is an exercise in compound interest: money saved early grows exponentially over decades, while money saved late must work much harder to produce the same result.
The central challenge of retirement planning is that you are trying to solve a problem with many unknowns: how long you will live, what investment returns will be, what inflation will do to your purchasing power, and what your expenses will actually be in retirement. Good retirement planning doesn't pretend to know the answers — it builds in margins of safety that account for uncertainty.
The 4% Rule: Where It Comes From and What It Really Means
The 4% rule originated from the Trinity Study, a landmark 1998 analysis by three Trinity University professors who examined historical U.S. market data from 1926 to 1995. They found that a portfolio of 50-75% stocks and 25-50% bonds could sustain withdrawals of 4% of the initial portfolio value (adjusted annually for inflation) for 30 years with a very high historical success rate.
The formula that follows from the 4% rule:
Retirement Number = Annual Expenses × 25
Because 4% × 25 = 100% of your annual expenses covered by withdrawal.
| Annual Expenses | Retirement Number (25×) | Monthly Income |
|---|---|---|
| $36,000/year | $900,000 | $3,000 |
| $48,000/year | $1,200,000 | $4,000 |
| $60,000/year | $1,500,000 | $5,000 |
| $72,000/year | $1,800,000 | $6,000 |
| $96,000/year | $2,400,000 | $8,000 |
| $120,000/year | $3,000,000 | $10,000 |
Important caveats: the 4% rule was derived from U.S. historical data during a period of strong stock market performance. Many researchers now suggest a 3% to 3.5% withdrawal rate is more appropriate given lower current bond yields and elevated market valuations. If you retire at 55 instead of 65, a 30-year horizon becomes a 40+ year horizon — which increases the risk that 4% is too aggressive.
How to Calculate Your Retirement Number Step by Step
Estimate your annual retirement expenses
Most financial planners use 70-80% of pre-retirement income as a starting estimate. But build your own list: housing, food, healthcare, travel, hobbies. Healthcare tends to rise in retirement; commuting and work-related costs fall. Be specific — a $500/month difference in expense estimate changes your retirement number by $150,000.
Determine your other income sources
Social Security (use SSA.gov to get your estimate), pension income if applicable, rental income, part-time work. Subtract these from your total expenses to find the gap your portfolio must cover. A couple with $3,000/month in combined Social Security only needs their portfolio to cover the remaining expenses — reducing the required nest egg dramatically.
Calculate your portfolio target
Multiply the annual gap (expenses minus other income) by 25 for the 4% rule, or by 33 for a more conservative 3% withdrawal rate. Example: $60,000 expenses minus $24,000 Social Security = $36,000 gap. At 4%: $36,000 × 25 = $900,000 needed.
Calculate required monthly savings
Use this calculator: enter your current savings, target retirement age, expected return, and the portfolio target as your goal. The calculator will tell you the required monthly contribution. If the number is higher than you can afford, adjust the retirement age or expense target.
Stress test your plan
Run the calculator at 5% return instead of 8%. Run it with retirement at 67 instead of 65. See what happens if you live to 95. A plan that only works under optimistic assumptions is fragile. A good retirement plan survives realistic worst-case scenarios.
What Return Rate Should You Use?
The return rate you assume has an enormous impact on projected outcomes. The table below shows what $500/month invested over 30 years produces at different return assumptions.
| Annual Return | Typical Portfolio Type | $500/mo over 30 yrs |
|---|---|---|
| 4% | Conservative (bonds heavy) | $347,000 |
| 5% | Moderately conservative | $416,000 |
| 6% | Balanced (60/40 stocks and bonds) | $502,000 |
| 7% | Moderately aggressive | $608,000 |
| 8% | Growth-oriented equity portfolio | $745,000 |
| 10% | 100% equities (historical S&P 500) | $1,131,000 |
* $500/month contribution, 30-year period, no initial balance. Results rounded.
The difference between a 6% and 8% assumption is $243,000 over 30 years — on the same contributions. This is why the return rate input deserves careful thought. The U.S. stock market has historically returned approximately 10% nominally and 7% in real (inflation-adjusted) terms. For planning purposes, most financial advisors recommend using 6-7% for a balanced portfolio to build in a margin of safety.
Retirement Account Types: Where to Save Matters
401(k) / 403(b)
Employer-sponsored plans with the highest contribution limits ($23,500 in 2025, $31,000 if 50+). Contributions are pre-tax (Traditional) or after-tax (Roth). Always contribute at least enough to capture the full employer match — it is an instant 50-100% return on that contribution.
Traditional IRA
Individual retirement account with pre-tax contributions (if income-eligible). Contributions reduce taxable income now; withdrawals in retirement are taxed as ordinary income. $7,000 annual limit in 2025 ($8,000 if 50+). Best if you expect to be in a lower tax bracket in retirement.
Roth IRA
Contributions are after-tax but all growth and qualified withdrawals are completely tax-free. The same $7,000 annual limit applies. Income limits restrict direct contributions for high earners (backdoor Roth available). Best if you expect your tax rate to be equal or higher in retirement.
HSA (Health Savings Account)
Triple tax advantage: pre-tax contributions, tax-free growth, tax-free withdrawals for medical expenses. After age 65, withdrawals for any purpose are taxed like a Traditional IRA — no penalty. Often called a 'stealth retirement account.' 2025 limits: $4,150 individual / $8,300 family.
The Cost of Starting Late: A Concrete Comparison
The single most impactful retirement planning decision is when you start. The table below shows the portfolio value at age 65 for the same $500/month contribution at 7% return, starting at different ages.
| Start Age | Years Investing | Total Contributed | Portfolio at 65 | Cost of Waiting |
|---|---|---|---|---|
| Age 22 | 43 yrs | $258,000 | $1,739,000 | — |
| Age 25 | 40 yrs | $240,000 | $1,399,000 | $340,000 |
| Age 30 | 35 yrs | $210,000 | $1,002,000 | $737,000 |
| Age 35 | 30 yrs | $180,000 | $702,000 | $1,037,000 |
| Age 40 | 25 yrs | $150,000 | $479,000 | $1,260,000 |
| Age 45 | 20 yrs | $120,000 | $313,000 | $1,426,000 |
* $500/month at 7% annual return. Portfolio value at age 65. Rounded to nearest $1,000.
Starting at 35 instead of 25 costs over $1,000,000 in retirement portfolio value — despite only contributing $60,000 less. The missing $697,000 is pure compound interest that had no time to accumulate. This table makes the urgency of starting now viscerally clear: every decade of delay roughly halves the final portfolio value.
Common Retirement Planning Mistakes
Underestimating healthcare costs
Fidelity estimates the average couple will need approximately $315,000 in after-tax savings just for healthcare costs in retirement, excluding long-term care. Healthcare inflation consistently runs higher than general inflation. Build a specific healthcare budget line into your retirement expense estimate.
Not accounting for inflation
At 3% annual inflation, $60,000 in expenses today requires $97,000 in 20 years and $131,000 in 30 years to maintain the same standard of living. Using nominal return rates without inflation adjustment overstates real purchasing power. Either use real return rates (nominal minus inflation) or build inflation into your expense projections.
Cashing out retirement accounts when changing jobs
Approximately 40% of people cash out their 401(k) when leaving a job, according to Vanguard research. This triggers ordinary income tax plus a 10% early withdrawal penalty — and eliminates all future compound growth on that money. Always roll over to an IRA or new employer plan instead.
Ignoring sequence of returns risk
A market crash in the first few years of retirement — when you are withdrawing from a portfolio that just declined significantly — can permanently impair your retirement income. The average return over 30 years matters less than what happens in years one through five. Consider maintaining 1-2 years of expenses in cash as a buffer.
Frequently Asked Questions
How much do I need to retire comfortably?
The most common benchmark is 25 times your annual expenses (the 4% rule). If you spend $60,000 per year and have no pension or Social Security, you need $1,500,000. With $24,000/year in Social Security, you only need to cover $36,000 from your portfolio — requiring $900,000. Your specific number depends heavily on your expected lifestyle and income sources.
Is the 4% rule still valid in 2026?
Many researchers argue the 4% rule may be optimistic in the current environment of elevated equity valuations and lower bond yields compared to the historical period from which it was derived. A 3% to 3.5% withdrawal rate is more conservative and may be more appropriate for longer retirements (35+ years). The original Trinity Study is worth reviewing, as is the updated research by Pfau and others.
Should I prioritize paying off my mortgage or saving for retirement?
If your employer offers a 401(k) match, always contribute at least enough to capture the full match first — it is an instant return that beats virtually any investment. Beyond that, the decision depends on your mortgage rate vs. expected investment returns. At mortgage rates below 4-5%, investing typically wins mathematically. At higher rates, the guaranteed 'return' of paying off debt may be more attractive.
What is a reasonable Social Security benefit to plan on?
Create a free account at SSA.gov to see your projected benefit based on your actual earnings history. As a rough guide, the average Social Security benefit in 2025 is approximately $1,900/month, but benefits range widely. Do not plan on Social Security covering your full retirement income — treat it as a supplement to your portfolio withdrawals.
How does inflation affect my retirement savings?
Inflation erodes purchasing power continuously. If you retire with $1,500,000 and withdraw $60,000 in year one, by year 20 at 3% inflation you will need $108,000 to buy the same goods and services. The 4% rule accounts for this by adjusting withdrawals annually for inflation, which is why the initial withdrawal rate matters so much.
Can I retire early if I have enough saved?
Yes, but early retirement requires a larger nest egg because the portfolio must sustain withdrawals for longer — potentially 40-50 years instead of 30. Many early retirees use a 3% or 3.5% withdrawal rate to reduce the risk of running out of money. See our Early Retirement (FIRE) calculator for detailed early retirement projections.
References
- →Retirement Income Planning — U.S. Securities and Exchange Commission (SEC)
- →Trinity Study (Sustainable Withdrawal Rates) — Journal of Financial Planning, 1998
- →Social Security Retirement Benefits — Social Security Administration (SSA.gov)
- →401(k) Contribution Limits 2025 — Internal Revenue Service (IRS)
- →Healthcare Costs in Retirement — Fidelity Investments Research
- →Sequence of Returns Risk — CFP Board
Sattva
·Reviewed by Prana
·Updated July 2026
Fintech developer and personal finance writer. All content reviewed for accuracy against established financial standards.