How does the life expectancy calculator reach its estimate?
It begins with the average remaining years for someone of your current age and sex in a U.S. period life table, which is built from death rates observed in a single recent year. Those tables do not assume future medical progress.
It then scales the remaining years with simple lifestyle factors: about 20% fewer years for smokers, about 8% more for excellent health and about 15% fewer for poor health. These are broad population-style adjustments, nowhere near the detail of insurance underwriting or a doctor's assessment.
Your estimated life expectancy is your current age plus the adjusted remaining years. The plan-through age adds five more years as a margin for longevity risk, the chance of living longer than your money lasts.
Method, not a single formula: Remaining years = Life-table remaining years for your age and sex × lifestyle factors Estimated life expectancy = Current age + Remaining years Plan-through age = Estimated life expectancy + 5
- Life-table remaining years
- average additional years for your age and sex from U.S. period life tables
- Lifestyle factors
- rough multipliers for smoking (about 0.80), excellent health (about 1.08) and poor health (about 0.85)
Example: how the adjustments change a 45-year-old's planning age
Scenario: To show the mechanics, assume the life table gives a 45-year-old 36.0 remaining years. That is a round illustrative number, not a quoted table value; the calculator supplies the real baseline for your inputs.
- Baseline estimate45 + 36.0 = 81.0 years
- Smoker adjustment36.0 × 0.80 = 28.8 remaining years
- Adjusted life expectancy45 + 28.8 = 73.8 years
- Plan-through age73.8 + 5 = 78.8 years
With these illustrative inputs, a smoker's planning age is about 78.8, compared with 86.0 for the same person at baseline.
Every result here is a population-level average; your own health history, family history and access to care can move your outlook a great deal in either direction.
When can a life expectancy estimate help with money decisions?
Choosing how long retirement savings must last
A withdrawal plan needs a horizon. A cushioned planning age gives a reasonable starting point to test against.
Thinking about when to claim Social Security
Claiming later raises monthly benefits, which matters more the longer you live. A rough horizon helps frame the trade-off, though the decision involves much more than one number.
Comparing a lump sum with lifetime income
Pensions and annuities that pay for life become more valuable the longer you live. A horizon helps compare them with taking cash.
Sizing life insurance or long-term goals
Knowing roughly how many years a goal must cover can help frame how much coverage or savings it needs, alongside professional advice.
What mistakes do people make with life expectancy numbers?
Planning to run out of money at the average age
About half of people outlive the average. Planning to exactly that age builds in roughly even odds of falling short.
Using life expectancy at birth
Life expectancy at birth includes deaths in childhood and early adulthood. Someone who has already reached 60 can expect to live to an older age than the at-birth figure suggests.
Treating the estimate as personal
Family history, specific conditions and access to care are not part of this tool. It cannot say how long you, individually, will live.
Planning a couple around one person
The chance that at least one of two people reaches an advanced age is higher than for either alone. Couples often plan to the later of the two horizons, or beyond.
Why does a longer planning horizon lower what you can spend?
The same savings must stretch over more years when the horizon is longer, so each year's share shrinks. The table spreads a $500,000 portfolio evenly from age 65, assuming a 3% annual return and withdrawals at the end of each year, until the balance reaches zero at different ages.
Planning to 95 instead of 85 lowers the level annual withdrawal by about a quarter in this illustration. That is the price of protection against a long life, and it is why a cushion beyond average life expectancy is common in retirement planning.
| Money lasts to | Years of withdrawals | Annual withdrawal |
|---|---|---|
| Age 85 | 20 years | $33,607.85 |
| Age 90 | 25 years | $28,713.94 |
| Age 95 | 30 years | $25,509.63 |
| Age 100 | 35 years | $23,269.65 |
How do the lifestyle adjustments compare?
Using the same illustrative 45-year-old with a 36.0-year baseline, the table shows each adjustment on its own. The calculator can apply more than one when you select them together.
The spread between the best and worst rows is more than a decade, which is a reminder that broad averages hide a wide range of individual outcomes.
| Scenario | Remaining years | Life expectancy | Plan through |
|---|---|---|---|
| No adjustment (baseline) | 36.0 | 81.0 | 86.0 |
| Excellent health (+8%) | 38.9 | 83.9 | 88.9 |
| Poor health (−15%) | 30.6 | 75.6 | 80.6 |
| Smoker (−20%) | 28.8 | 73.8 | 78.8 |
Terms used on this page
- Inflation
- Inflation is the general rise in prices over time, which reduces how much a dollar can buy. In the US it is most often measured by the Consumer Price Index, published monthly by the Bureau of Labor Statistics. When your savings earn less than inflation, their purchasing power shrinks even though the dollar balance grows.
- Real Rate of Return
- The real rate of return is what your money earns after adjusting for inflation. It shows the actual growth in purchasing power rather than in dollars. A quick estimate is the nominal rate minus inflation; the exact figure is (1 + nominal) ÷ (1 + inflation) − 1, which is slightly smaller.
Life Expectancy Calculator: common questions
How accurate is an online life expectancy estimate?
Only roughly accurate, and only as an average. This calculator starts from population life tables and applies a few broad adjustments; it does not know your medical or family history. It is designed for financial planning, where a reasonable horizon is useful, not for medical or personal decisions. Official life tables are published by the Social Security Administration and the CDC.
Why does my life expectancy go up as I get older?
Because you have already survived the years behind you. Life expectancy at birth averages in everyone who dies young, while life expectancy at 65 only counts people who reached 65. So your total expected age rises over time, even as your remaining years shrink. This is why a retiree's planning horizon is usually later than the figure quoted at birth.
What is longevity risk?
Longevity risk is the chance of living longer than your savings last. Because life expectancy is an average, planning to exactly that age leaves a substantial chance of outliving the money. Common ways to manage it include planning to a later age, delaying Social Security to raise lifetime monthly income, and keeping withdrawal rates conservative.
What is a period life table?
A period life table shows death rates and expected remaining years at each age, based on deaths in a single year. It effectively assumes those death rates never change. Because health and medical care have tended to improve over time, people alive today may, on average, live somewhat longer than a period table implies, though that is not guaranteed.
Why does the calculator add five years to plan through?
The extra five years is a simple margin for longevity risk. Planning only to the average age means roughly half of people would outlive their plan. Five years is a starting cushion, not a recommendation; many retirement planners test plans to 95 or beyond, especially for couples or people in good health.
How much does smoking reduce life expectancy in this calculator?
The calculator reduces your remaining years by about 20% if you smoke, so a 36.0-year baseline would drop by 7.2 years. It is a broad population-style adjustment, not a personal forecast. Health risks from smoking decline after quitting, so a former smoker's outlook can improve over time. The adjustment applies to remaining years, not to your current age.
Should couples use a different planning age?
Often, yes. The probability that at least one of two people lives to a very old age is higher than the probability for either person alone. Couples frequently plan to the later of the two estimates or add extra years, since savings and income usually need to last for the surviving partner.
Where can I find official life expectancy data?
The Social Security Administration publishes an actuarial life table showing remaining years at each age by sex, and the CDC's National Center for Health Statistics publishes national life expectancy figures. Both are linked in this page's sources. Insurers and pension plans may use their own tables for pricing. Those tables are the most reliable starting point for any planning figure.
Can I use this estimate to decide when to claim Social Security?
It can inform the decision but should not make it. Delaying benefits raises your monthly payment, which pays off more the longer you live. A rough horizon helps frame that trade-off, but spousal benefits, health, other income and taxes all matter. Official tools from the Social Security Administration can show your personal benefit amounts.
Sources
- Actuarial Life Table — Social Security Administration. Accessed October 17, 2026.
- FastStats: Life expectancy — Centers for Disease Control and Prevention. Accessed October 17, 2026.
- Survey of Household Economics and Decisionmaking (SHED) — Federal Reserve Board. Accessed October 17, 2026.
We cite primary sources: regulators, central-bank data and federal agencies. Worked examples on this page are our own calculations, last checked October 17, 2026. See our methodology.