How this retirement calculator works
It runs your plan in two halves. First it grows what you’ve already saved plus your monthly contributions up to your retirement age — that’s the climbing part of the chart. Then it spends that nest egg back down through retirement, withdrawing what you need each year (after Social Security or a pension), adjusted for inflation. Where those two halves meet is your nest egg; how far the second half stretches is how long your money lasts.
Every figure is shown in today’s money so the numbers feel real, and every assumption — how long you plan for, your expected returns, inflation, and your safe withdrawal rate — is visible and editable. Nothing is a black box.
Reading your verdict
The verdict is a calm, three-state read: On track, Almost there, or Let’s close the gap. It’s never a pass/fail — the math stays honest, but a shortfall is framed as a solvable plan. Whenever there’s a gap, you’ll see the exact extra monthly saving that reaches on-track, and the alternative of retiring a year or two later. The funded-ratio arc shows how close you already are, and Social Security usually does more of the heavy lifting than people expect.
Frequently asked questions
How much do I need to retire?
A common rule of thumb is about 25× your annual spending — but the honest answer depends on how much Social Security or a pension covers, how long you plan for, and your expected returns. This calculator nets out your other income, plans to age 90 by default, and shows the precise nest egg you need in today’s money. Enter your numbers above to see yours.
Can I retire at 65 with $1 million?
For many people, yes — especially with Social Security covering part of the bill. At a 4% withdrawal rate, $1 million provides about $40,000 a year before other income. Whether that’s enough depends on your spending: set your target above and you’ll get a clear verdict plus the exact change that would close any gap.
What is the 4% rule?
The 4% rule is a guideline for how much you can withdraw from your savings each year without running out — roughly 4% of your starting balance, adjusted for inflation thereafter. It’s a starting point, not a guarantee. You can change the withdrawal rate in the assumptions to be more cautious or more aggressive.
Does Social Security change how much I need to save?
A lot. Social Security (or a pension) directly offsets what your savings have to cover. If you want to spend $60,000 a year and Social Security provides $24,000, your portfolio only needs to fund the remaining $36,000 — which dramatically lowers the nest egg you need. The average US check is around $1,900 a month.
Worked examples
Each scenario below is computed by the same retirement engine that powers the interactive calculator above — no hand-typed numbers.
Age 35, on a solid path
Mid-career professional with $75,000 saved, contributing $600/month toward a $60,000/year retirement lifestyle.
Projected nest egg
$1,340,720
Required (today's $)
$745,463
Funded ratio
74%
Monthly income
$3,741/mo
30 years of compounding and $600/month of consistent contributions do the heavy lifting — time is the most powerful retirement variable.
Late starter at 45
Someone who started saving in their mid-40s with $40,000 saved, contributing $1,200/month, targeting retirement at 67.
Projected nest egg
$935,325
Required (today's $)
$559,241
Funded ratio
87%
Monthly income
$3,727/mo
Starting late makes the monthly contribution the dominant lever — increasing savings rate matters far more than investment returns at this stage.
Early retirement at 55 (FIRE)
High saver targeting retirement at 55 with $350,000 accumulated, contributing $3,000/month, aiming for $80,000/year in spending.
Projected nest egg
$1,948,018
Required (today's $)
$2,387,205
Funded ratio
52%
Monthly income
$3,647/mo
A 35-year retirement horizon demands a lower withdrawal rate (3.5%) and no Social Security bridge — the required nest egg is substantially larger than a standard 65-retirement plan.
Projected nest egg by monthly contribution and retirement age
Starting at age 35 with $75,000 saved, 7% pre-retirement return, 3% inflation.
| Monthly contribution ($) | 60 | 62 | 65 | 67 | 70 |
|---|---|---|---|---|---|
| $400 | $753K | $877K | $1M | $1M | $2M |
| $600 | $915K | $1M | $1M | $2M | $2M |
| $800 | $1M | $1M | $2M | $2M | $2M |
| $1,200 | $1M | $2M | $2M | $2M | $3M |
| $2,000 | $2M | $2M | $3M | $4M | $4M |
Nominal dollars at retirement. Inflation-adjusted figures are typically 40–50% lower over a 30-year horizon.
What affects your retirement outcome
Years until retirement
Compounding is exponential — each additional year in the accumulation phase multiplies your balance. Retiring at 65 vs 62 can add 20–30% to your nest egg with the same contributions.
Monthly contribution
The amount you add each month compounds the most aggressively over long horizons. Increasing contributions by $200/month at age 35 can add $200,000+ to your final balance.
Current savings balance
Every dollar saved today compounds for decades before retirement. A $50,000 head start at age 35 can be worth $380,000 by age 65 at 7% returns.
Pre-retirement investment return
Expected return on your portfolio during accumulation. Shifting from 6% to 8% on the same starting balance over 30 years roughly doubles the ending balance.
Social Security / pension income
Other income reduces how much your portfolio needs to cover, directly shrinking the required nest egg. An extra $500/month of Social Security reduces the required portfolio by about $150,000 at a 4% SWR.
Desired annual spending
Your retirement lifestyle target is the denominator of the 25× rule. Reducing spending by $10,000/year reduces the required nest egg by $250,000 (at a 4% SWR).
Inflation rate
Higher inflation erodes real purchasing power and inflates the nominal withdrawals needed in late retirement. Most plans use 2.5–3.5% as a conservative estimate.
Common retirement planning mistakes
- •Using the 25× rule without netting out Social Security or pension income, which overstates the required portfolio by hundreds of thousands of dollars.
- •Assuming a single static return rate without planning for lower post-retirement returns, which historically average 1–2% less than accumulation-phase returns.
- •Ignoring sequence-of-returns risk — a 30% market loss in year 1 of retirement is far more damaging than the same loss 10 years in.
- •Forgetting to inflation-adjust future spending — $60,000 per year feels manageable today but its nominal cost in 30 years at 3% inflation will be about $146,000.
- •Treating life expectancy as the end date rather than a midpoint — half of 65-year-olds live beyond their actuarial life expectancy, so planning to 90+ significantly reduces longevity risk.
Practical takeaways
- ✓The single highest-leverage action before age 45 is increasing monthly contributions — even $200/month more today compounds dramatically over 20–30 years.
- ✓Working two to three years longer than planned is often more effective than increasing contributions late in your career — it adds accumulation years and removes early drawdown years simultaneously.
- ✓Delaying Social Security from 62 to 70 increases your monthly benefit by roughly 77%, which reduces the portfolio needed to cover your spending gap.
- ✓A real (inflation-adjusted) post-retirement return of 2–3% is a reasonable planning assumption; using 5–7% nominal is dangerously optimistic for drawdown.
- ✓Monte Carlo analysis (not shown here) estimates probabilities of success across thousands of scenarios — a 90%+ success rate is a more robust retirement target than breaking even on the median scenario.
Retirement planning glossary
- Nest egg
- The total portfolio value you have accumulated by retirement. It funds your spending during the drawdown phase, supplemented by Social Security and any pension income.
- Safe withdrawal rate (SWR)
- The percentage of your portfolio you can withdraw each year with a high probability that the money lasts through retirement. The widely cited 4% rule comes from the Trinity Study, which found 4% survived all 30-year periods in US market history.
- Rule of 25
- A shorthand for estimating how much you need to retire: multiply the annual spending your portfolio must cover by 25. This is the mathematical inverse of a 4% withdrawal rate.
- Funded ratio
- Your projected nest egg divided by the nest egg required at retirement, both measured in today's money. A funded ratio of 1.0 means exactly on track; 1.2 means 20% surplus; 0.8 means 20% short.
- Real return
- Investment return after subtracting inflation. If your portfolio earns 7% and inflation runs at 3%, your real return is roughly 4%. All the "today's money" figures in this calculator use real returns to keep outputs interpretable.
- Decumulation
- The retirement phase where you spend down (draw from) your nest egg rather than accumulating it. Portfolio management during decumulation is more complex because sequence-of-returns risk can permanently impair a portfolio early in retirement.
- Sequence-of-returns risk
- The danger that poor investment returns in the early years of retirement permanently reduce your portfolio, even if long-run average returns are fine. A 30% loss in year 1 of retirement is far more damaging than the same loss in year 20.
- Accumulation phase
- The working years before retirement, during which you build your nest egg through savings and investment growth. The length of the accumulation phase is one of the most powerful levers in retirement planning.
- Inflation-adjusted (real) dollars
- Dollar amounts expressed in today's purchasing power. This calculator shows all outputs in today's money so $60,000 of spending at retirement means $60,000 of what you can buy today — even if the nominal cost is higher by then.
More retirement questions
What does the funded ratio mean?
The funded ratio compares your projected nest egg (in today's dollars) to the nest egg required to fund your desired spending through your life expectancy. A ratio of 1.0 means exactly on track. A ratio of 0.85 means your projected portfolio covers 85% of what you need — the gap tells you exactly how much to close through higher contributions, a later retirement date, or reduced spending.
Why does the calculator show results in "today's money"?
Showing nominal (future) dollars creates an illusion of wealth — $1.2 million in 30 years sounds impressive until you realize it has the purchasing power of about $500,000 today at 3% inflation. Displaying everything in today's money makes the numbers intuitively meaningful: the $60,000 annual spending target means exactly what $60,000 buys today, regardless of when you retire.
What is a safe withdrawal rate and should I use 4%?
The 4% rule originated from the Trinity Study, which found that withdrawing 4% of your initial portfolio per year (adjusted for inflation) survived all 30-year periods in US market history. For retirements longer than 30 years, or in a low-return environment, many planners now use 3.5% or 3.25%. For very early retirees with 40+ year horizons, 3% is a more conservative choice. This calculator lets you set your own rate.
How much does delaying retirement help?
Working longer helps in three compounding ways: it adds accumulation years (your portfolio keeps growing), it removes drawdown years (your portfolio runs for fewer years), and it typically increases Social Security benefits (higher earnings record, plus delayed claiming). In most scenarios, working two to three years longer has a larger impact on retirement security than increasing savings by 20–30%.
Is $1 million enough to retire on?
It depends on your spending and other income. At a 4% SWR, $1 million supports $40,000/year from your portfolio. Add $24,000 in Social Security and you have $64,000/year in today's money — comfortable for many, tight for others. If your spending need is $80,000 and Social Security covers $20,000, your portfolio must cover $60,000/year, requiring $1.5 million. The calculator will show you the exact required nest egg for your numbers.
What return rate should I use for my retirement portfolio?
A common planning assumption for a diversified stock/bond portfolio is 6–7% pre-retirement and 4–5% post-retirement (more conservative allocation). These are nominal figures; the real (inflation-adjusted) returns are roughly 3–4% pre-retirement and 1–2% post-retirement. Using 10% or higher — sometimes cited from historical US equity returns — overstates likely results and creates a false sense of security.
What this calculator does — and does not — compute
Retirement projections involve inputs that come from government agencies, employers, and tax rules this tool cannot access. Here is exactly what you are providing versus what this calculator handles on its own.
- 1.Social Security is not calculated here. You enter your own monthly estimate in the “Other monthly income” field. This tool does not access your earnings record or apply Social Security benefit formulas. To get your actual personalized estimate, create a free account at ssa.gov/myaccount.
- 2.Required Minimum Distributions (RMDs) are not modeled. The drawdown projection shows balance depletion under your stated withdrawal rate, but it does not enforce IRS RMD schedules (which begin at age 73 for most accounts) or calculate RMD amounts from IRS life-expectancy tables. If RMDs apply to you, actual withdrawals may differ from the projection shown.
- 3.Pension income is an input you provide, not a computed output. If you have a defined-benefit pension, enter your expected monthly payment in “Other monthly income.” This tool does not compute pension formulas (FERS, CalPERS, military, state, or private plan formulas) and does not connect to any employer or government pension system.
- 4.Withdrawal tax treatment is simplified and illustrative. The projection shows gross withdrawals from your portfolio. It does not calculate federal or state income taxes on traditional 401k or IRA distributions, does not model Roth tax treatment, and does not account for RMD-driven bracket changes. Actual after-tax income will differ. For tax planning specific to your situation, consult a qualified tax professional.
- 5.Any depletion result is a projection, not a guarantee. “How long your money lasts” and similar outputs are calculated under your stated return rate, inflation rate, and spending assumptions. Actual outcomes depend on market performance, sequence of returns, unexpected expenses, and life events that cannot be modeled in advance. A projection is a planning tool, not a promise.
This calculator is for educational and planning purposes only. It does not constitute financial, tax, or investment advice.