If you’re searching for a how long will retirement savings last calculator, you’re really asking one specific question: at what withdrawal rate and investment mix does your money run out, and when? The honest answer depends on three numbers — your withdrawal rate, your investment returns, and inflation — and this guide walks through the actual math behind that answer instead of just handing you an unexplained widget like most bank calculator pages do.
Quick Facts
| Category | Details |
|---|---|
| Core Concept | How long a retirement portfolio lasts at a given withdrawal rate |
| 2026 Safe Withdrawal Rate (Morningstar base case) | 3.9% for a 30-year retirement, 90% success rate |
| Median Retirement Savings (Ages 65–74) | $200,000 |
| Average Retirement Savings (Ages 65–74) | $609,230 |
| RMD Start Age (born 1960 or later) | 75 |
| RMD Start Age (born 1951–1959) | 73 |
| Key Risk Factor | Sequence-of-returns risk in the first 5–10 years of retirement |
| What It Doesn’t Replace | Personalized financial or tax advice |
What Is a “How Long Will Retirement Savings Last” Calculator?
A retirement savings longevity calculator estimates how many years your portfolio can sustain withdrawals before running out, based on your starting balance, withdrawal rate, expected investment return, and inflation assumption. It’s a different question than how much you actually need to retire in the first place, since this calculator starts from what you already have and works forward, rather than starting from a retirement income goal and working backward.
The reason this matters is that a small change in withdrawal rate has an outsized effect on how long money lasts. Withdrawing 4% a year from a $700,000 portfolio behaves very differently over 30 years than withdrawing 6%, even though the difference sounds small on paper.
Most bank-hosted versions of this calculator present a single output number without showing the assumptions driving it, which makes it hard to know whether that number is conservative, aggressive, or somewhere in between. Understanding the inputs yourself is what actually lets you judge whether a given result is realistic for your situation.
How the Math Actually Works
Every version of this calculator, no matter which bank or site hosts it, runs on the same core formula: starting balance, minus annual withdrawal (adjusted upward each year for inflation), growing or shrinking based on investment returns, repeated year by year until the balance hits zero. The order of three inputs — withdrawal rate, rate of return, and inflation — determines everything else.
This is also where sequence-of-returns risk comes in, and it’s the detail most calculator-widget pages skip entirely. A retiree who experiences a market downturn in their first few retirement years, while still withdrawing a fixed dollar amount, depletes their portfolio faster than someone who hits the exact same average return but in a different order, simply because they’re selling more shares at depressed prices early on when the damage compounds for decades.
How Long Will Retirement Savings Last in 2026?
For 2026, Morningstar’s research puts the “safe” starting withdrawal rate at 3.9% for a new retiree planning a 30-year retirement with a 90% success rate — meaning a portfolio invested in roughly 30% to 50% stocks, with the rest in bonds, withdrawing 3.9% in year one and adjusting that dollar amount for inflation each year after, has a 90% historical chance of lasting three decades without running out.
That 3.9% figure has moved around over the past several years: Morningstar’s base case was 3.3% in 2021, 3.8% in 2022, 4.0% in 2023, and 3.7% in 2024, before rising again to 3.9% for 2026 as bond yields and market conditions shifted. None of the three bank calculator pages reviewed for this guide mention this figure or how much it has moved recently, which matters because a calculator defaulting to a flat “4%” assumption without context can overstate how safe that rate currently is.
To put real numbers on it: with the current median retirement savings of $200,000 for households aged 65 to 74, a 3.9% withdrawal rate means starting with about $7,800 in year-one withdrawals, not counting Social Security or a pension, which is why most retirement income plans combine savings withdrawals with guaranteed income sources rather than relying on savings alone.
Breaking Down What Determines How Long Your Money Lasts
Withdrawal rate: The single biggest lever. Dropping from a 5% to a 4% withdrawal rate on the same balance can add a decade or more of portfolio life, all else being equal.
Investment return and asset allocation: A portfolio with too little in stocks may not grow fast enough to outpace withdrawals and inflation over a 20-30 year retirement, while one with too much in stocks faces larger swings exactly when sequence-of-returns risk matters most.
Inflation: Even moderate inflation compounds significantly over a 20-30 year retirement. A withdrawal that starts at $30,000 a year needs to become roughly $54,000 a year after 20 years at just 3% average inflation, simply to maintain the same purchasing power.
Required Minimum Distributions (RMDs): Once you reach RMD age — 73 for those born 1951 to 1959, or 75 for those born in 1960 or later under the SECURE 2.0 Act — the IRS forces minimum withdrawals from traditional 401(k) and IRA accounts regardless of whether you actually need the income that year, which can affect your long-term withdrawal strategy and taxes.
Social Security and pensions: Guaranteed income reduces how much you need to pull from savings, directly extending how long a portfolio lasts; delaying Social Security past full retirement age increases that guaranteed amount for life, which is a lever a pure savings calculator won’t show you on its own, in the same way thinking through dollar-cost averaging versus a lump sum is a separate decision from the withdrawal-rate question itself.
Withdrawal Rate Comparison: How Long $500,000 Lasts
| Withdrawal Rate | Year-One Withdrawal (on $500,000) | Approx. Years Until Depleted* |
|---|---|---|
| 3% | $15,000 | 40+ years (may never deplete) |
| 3.9% (Morningstar 2026 base case) | $19,500 | ~30 years, 90% success rate |
| 5% | $25,000 | ~20-25 years |
| 6% | $30,000 | ~15-18 years |
| 7% | $35,000 | ~12-15 years |
*Estimates assume a diversified 30%-50% stock portfolio, inflation-adjusted withdrawals, and average historical market returns; actual results vary significantly based on market sequence, fees, and taxes. These are illustrative ranges, not guarantees.
Practical Takeaways
Start any “how long will retirement savings last” estimate with your actual withdrawal rate, not just your balance, since two retirees with identical savings can have wildly different outcomes depending on that one number. If your calculated withdrawal rate comes out above roughly 5%, treat that as a signal to either delay retirement, reduce planned spending, or build in more guaranteed income, rather than assuming the portfolio will somehow stretch.
It’s also worth stress-testing your plan against a bad first-decade scenario, since sequence-of-returns risk means the same average return can produce very different outcomes depending on timing. Someone still building savings today might find it useful to also think through how an emergency fund functions as a separate buffer from retirement withdrawals, so a market downturn doesn’t force you to sell retirement assets at a bad time to cover short-term cash needs.
Finally, revisit the calculation periodically rather than treating it as a one-time number. Markets move, life expectancy assumptions shift, and tax rules like RMD ages change — as they did under SECURE 2.0 — so a withdrawal plan built five years ago may already need adjusting; our Retirement section tracks these kinds of updates as the numbers shift.
It also helps to separate the math from the emotion. A calculator can tell you that a 4.5% withdrawal rate has, say, an 80% historical success rate, but only you can decide whether that 20% chance of running short is a risk worth taking given your other income sources, health, and how flexible your spending could be in a bad year.
People Also Ask
How long will retirement savings last calculator results typically show for $500,000?
At Morningstar’s 2026 base-case 3.9% withdrawal rate, $500,000 is designed to last roughly 30 years with a 90% historical success rate; at a more aggressive 6% withdrawal rate, the same balance may be depleted in 15 to 18 years.
What is a safe withdrawal rate for retirement in 2026?
Morningstar’s 2026 research puts the base-case safe withdrawal rate at 3.9% for a new retiree planning a 30-year retirement with a 90% success rate, though more flexible retirees willing to adjust spending in down years may be able to start closer to 6%.
How much money do I need to retire comfortably?
This depends heavily on your expected spending, Social Security or pension income, and desired withdrawal rate; working backward from a 3.9% withdrawal rate, every $1,000 in desired annual income from savings alone requires roughly $25,600 saved.
What is the 4% rule?
The 4% rule, originally developed by financial planner William Bengen in the 1990s, suggests withdrawing 4% of a retirement portfolio in year one and adjusting that dollar amount for inflation each year after, based on historical market data over 30-year periods.
Does Social Security count in a retirement savings longevity calculation?
Most basic calculators only model your investment portfolio, not guaranteed income; Social Security and pensions reduce how much you need to withdraw from savings each year, which directly extends how long your portfolio lasts.
At what age do I have to start withdrawing from my 401(k) or IRA?
Under SECURE 2.0, required minimum distributions start at age 73 for those born between 1951 and 1959, and at age 75 for those born in 1960 or later.
How does inflation affect how long retirement savings last?
Inflation increases the dollar amount you need to withdraw each year just to maintain the same purchasing power, which is why most credible withdrawal-rate research, including Morningstar’s, models inflation-adjusted withdrawals rather than a flat dollar amount every year.
What happens if I withdraw too much too soon in retirement?
Withdrawing above a sustainable rate, especially during a market downturn early in retirement, can permanently damage a portfolio’s ability to recover — a dynamic known as sequence-of-returns risk — potentially depleting savings a decade or more earlier than a more conservative withdrawal rate would.
Is the 4% rule still accurate in 2026?
Not exactly — Morningstar’s own updated research puts the 2026 base-case safe withdrawal rate at 3.9%, slightly below the traditional 4% figure, reflecting current bond yields and market return expectations rather than the original 1990s-era research.
How is average retirement savings different from median retirement savings?
Average retirement savings for ages 65-74 is $609,230, while the median is just $200,000; the gap exists because a small number of very high-balance households pull the average up, making the median a more realistic benchmark for typical savers.
The Bottom Line
A how long will retirement savings last calculator is only as useful as the assumptions behind it, and most of the ones online hand you a number without explaining where it comes from. The real answer depends on your withdrawal rate far more than your total balance, with Morningstar’s 2026 research now pointing to roughly 3.9% as a reasonably safe starting point for a 30-year retirement, down slightly from the traditional 4% rule most people have heard of.
Inflation, investment mix, Social Security timing, and RMD rules all shift that number in one direction or another, which is why this is worth recalculating every few years rather than treating it as a one-time answer. If you take one thing from this guide, let it be that the withdrawal rate you choose matters more than almost anything else in this calculation — more than the specific calculator you use to run it.
For more breakdowns like this one, visit Snoopstats.
