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Life Expectancy Calculator
Add a partner (couple / joint odds)
Enter your birth date and choose a life table. The calculator then looks up how many more years people of your age and sex live on average, using the CDC’s 2024 US life tables. A 40-year-old man has about 39.0 years left, for example, which takes him to roughly 79. That figure belongs to a large group of men, so your own life may run longer or shorter. Three sister pages show the same numbers another way: the death clock counts down live, the life in weeks chart draws every week, and the life expectancy by age table lists ages 0 to 100.
The numbers come from the National Center for Health Statistics, part of the CDC, by exact age and sex. No table can say when one person will die. Your exact age is worked out from your birth date, and the age calculator shows it in years, months and days.
How the estimate is built
We read each figure from the ex column of the CDC’s United States Life Tables, 2024. Pick Combined for everyone, or the male or female table. A person halfway between two birthdays gets a value halfway between the two ages. Deaths from a single recent year drive the whole table, which is why it is a guide and not a promise. The optional offsets are rounded differences at birth, and they shrink with age so they never exceed the time left:
- Current smoking, about −10 years: a study of over 200,000 US adults found current smokers lose at least a decade of life expectancy compared with people who never smoked (Jha et al., New England Journal of Medicine, 2013).
- Former smoking, about −3 years: the same study found that people who quit at 25–34, 35–44 or 45–54 gained about 10, 9 and 6 years over those who kept smoking. So quitting avoids most of the loss, and −3 is a rough middle value.
- Regular activity, about +3 years: a pooled analysis of about 650,000 adults linked leisure-time activity with 1.8 to 4.5 more years of life expectancy after age 40, depending on the amount (Moore et al., PLOS Medicine, 2012).
All three come from studies of large groups, so they say nothing certain about you.
Weeks are years × 365.25 ÷ 7. The chart here shows one square per year of age; the life in weeks page draws every week.
Worked example: a 36-year-old on the combined table
Picture someone born on June 15, 1990 who opens the calculator on their birthday, June 15, 2026. They leave the table on Combined and skip the optional offsets. Their exact age that day is 36 years and 0 months.
The CDC 2024 total-population table gives 44.7 more years at exactly age 36. That points to an average total age of about 80.7. In weeks, 44.67 × 365.25 ÷ 7 comes to 2,330.8, which the result card rounds to 2,331. They have already lived about 1,878 weeks.
Adding 44.7 years to the check date lands on February 15, 2071. That date only shows where the average falls. Plenty of people live well past it, and plenty do not reach it.
Result: about 44.7 years (2,331 weeks) remaining on the CDC 2024 table, with 1,878 weeks already lived.
Weeks lived by age reference table
| Age (years) | Weeks lived | Days lived (approx.) |
|---|---|---|
| 10 | 522 | 3,653 |
| 18 | 939 | 6,575 |
| 21 | 1,096 | 7,670 |
| 25 | 1,304 | 9,131 |
| 30 | 1,565 | 10,958 |
| 35 | 1,826 | 12,784 |
| 40 | 2,087 | 14,610 |
| 45 | 2,348 | 16,436 |
| 50 | 2,609 | 18,263 |
| 55 | 2,870 | 20,089 |
| 60 | 3,131 | 21,915 |
| 65 | 3,392 | 23,741 |
| 70 | 3,653 | 25,568 |
| 75 | 3,913 | 27,394 |
| 80 | 4,174 | 29,220 |
| 85 | 4,435 | 31,046 |
| 90 | 4,696 | 32,873 |
| 100 | 5,218 | 36,525 |
Life expectancy by age and sex: average years left
Men and women sit side by side here, with the average age each group reaches on the CDC 2024 tables. A man who is already 90, for instance, can expect about 4.2 more years.
| Age now | Men: years left | Men: average age reached | Women: years left | Women: average age reached |
|---|---|---|---|---|
| 30 | 48.1 | 78.1 | 52.4 | 82.4 |
| 40 | 39.0 | 79.0 | 42.9 | 82.9 |
| 50 | 30.3 | 80.3 | 33.7 | 83.7 |
| 60 | 22.1 | 82.1 | 24.9 | 84.9 |
| 70 | 14.9 | 84.9 | 16.9 | 86.9 |
| 80 | 8.6 | 88.6 | 9.9 | 89.9 |
| 90 | 4.2 | 94.2 | 4.9 | 94.9 |
Life expectancy at 62, 65, 67 and 70 (when to claim Social Security)
A 65-year-old man has about 18.4 more years on average on the CDC 2024 period tables, which takes him to about 83. A woman of the same age has about 20.8, to about 86. One man in four lives to about 90, and one woman in four to about 92. Planners often use that 1-in-4 age for retirement income, because there is roughly a 25% chance of living longer.
| Age | Men: years left | Men: 1 in 4 live past | Women: years left | Women: 1 in 4 live past | Chance of reaching 90 (men / women) |
|---|---|---|---|---|---|
| 62 | 20.6 | 89.8 | 23.3 | 92.2 | 24% / 35% |
| 65 | 18.4 | 90.0 | 20.8 | 92.4 | 25% / 36% |
| 67 | 16.9 | 90.2 | 19.2 | 92.5 | 26% / 36% |
| 70 | 14.9 | 90.6 | 16.9 | 92.7 | 28% / 38% |
Pensions for two have to last until the second death. With both partners at 65, there is about a 52% chance that one of them is still alive at 90, and about 22% at 95. The partner box in the calculator works this out for any pair of ages.
Life expectancy in Excel or Google Sheets
You can rebuild the main result in a spreadsheet. Put the birth date in A2 and the years left from the tables above in B2. Then copy these formulas.
| What you want | Formula |
|---|---|
| Age in whole years today | =DATEDIF(A2,TODAY(),"y") |
| Average age reached | =DATEDIF(A2,TODAY(),"y")+B2 |
| Weeks left on average | =ROUND(B2*365.25/7,0) |
| Weeks already lived | =INT((TODAY()-A2)/7) |
| Date the average falls on | =EDATE(TODAY(),ROUND(B2*12,0)) |
Take B2 from the table above, using your sex and the nearest age. The calculator itself blends the two ages either side of yours, so its answer can differ by a few tenths.
Common mistakes
- Reading the figure as a death date. A life-table number is an average for a group. Real lifespans spread widely on both sides of it.
- Using life expectancy at birth for an adult. People who have already reached 60 or 70 have survived earlier risks, so official life tables give them a higher expected total age than the at-birth figure.
- Mixing period and cohort figures. Period tables use one year’s death rates. Cohort tables project future changes in mortality, so the two can differ for the same age.
- Treating offsets as precise. Smoking and activity adjustments are rounded group averages. They do not account for dose, timing, other conditions or medical care.
- Comparing tables from different years or countries. Life expectancy changes from year to year and differs between populations, so always note which table a number came from.
Life expectancy questions
How many weeks until I die?
Nobody can answer that for one person. This page shows the average weeks left for your age and sex on a US period life table. The life in weeks chart draws those weeks as a grid.
Can this tell me when I will die?
No. The figure is the average for thousands of people of your age and sex. Some of them die young and some pass 100, and the table cannot say where you will fall.
Why show weeks at all?
Weeks make a long span easier to picture next to age. The same math is available in years on the result card.
Is this the same as the age calculator?
The two pages look back and forward. The age calculator counts the time you have already lived, while this page adds the average time still ahead.
What is the average life expectancy in the US?
For 2024, the CDC’s National Center for Health Statistics reports US life expectancy at birth of 79.0 years: 76.5 years for males and 81.4 years for females.
What is a period life table?
A period life table applies the death rates observed at every age in one year to a hypothetical group of people. It shows how long they would live on average if those rates never changed.
How many weeks are in an average lifetime?
At 79 years, a lifetime is about 4,122 weeks (79 × 365.25 ÷ 7). That is where the popular “about 4,000 weeks” idea comes from.
How long will I live if I am 65?
On the CDC 2024 tables, a 65-year-old man has about 18.4 more years on average and a woman about 20.8, so to about 83 and 86. About 1 in 4 reach 90 (men) or 92 (women).
Why does my expected age at death go up as I get older?
Because you have already survived the risks of the earlier years. Life expectancy at birth is 79.0, but someone who reaches 65 can expect to reach about 85 on average.
What are the odds that one of a couple reaches 90?
For a man and a woman who are both 65, about 52% that at least one reaches 90, on the CDC 2024 tables. Add a partner in the calculator to see the odds for your ages.
Why are the SSA numbers different?
The Social Security Administration publishes its own life tables, and its longevity calculator uses cohort projections that assume death rates keep falling. Those usually come out a little higher than the CDC period table used here.
What are my chances of living to 100?
Small but real: on the CDC 2024 tables about 1.2% of men and 3.0% of women born today reach 100, and about 1.5% of men and 3.4% of women who are already 65. Enter your birth date above for your own age.
Is a life expectancy calculator accurate?
For a group, yes. The figures are the official averages for people of your age and sex. For one person it is only a starting point. Health, habits, income and family history all move the odds a lot.
What is the most accurate life expectancy calculator?
No calculator can tell one person's lifespan. Tools that ask about health, smoking and weight can narrow the range, but they still give averages for people like you. This one sticks to the official CDC table, plus two rough optional offsets.
Is this a lifespan or longevity calculator?
Those names are used for the same job. A lifespan calculator or longevity calculator usually means a life expectancy estimate like this one. Some longevity tools add health questions, while this page uses age, sex and the life table.
What is the difference between period and cohort life expectancy?
A period life table, like the CDC 2024 table used here, applies one year’s death rates to every age. A cohort life table follows people born in the same year and builds in expected future falls in death rates, so cohort figures are usually a few years higher. The Social Security Administration publishes cohort tables; for remaining life expectancy at every age on the period table, see the full table.
Is this an actuarial life expectancy calculator?
It uses the same kind of table actuaries start from: a life table of death rates by exact age and sex (the CDC’s 2024 US table). Insurers and pension plans then adjust for their own members, health and future improvements, so their figures can differ.
Sources
- CDC National Center for Health Statistics: Life Expectancy (FastStats) — US life expectancy at birth for 2024, total and by sex
- CDC NCHS, United States Life Tables, 2024 (data tables 1–3) — remaining life expectancy at each age for the total population, males and females, used by this calculator
- Jha P, et al. 21st-century hazards of smoking and benefits of cessation in the United States. N Engl J Med 2013;368:341–350 — smoking and quitting offsets
- Moore SC, et al. Leisure time physical activity of moderate to vigorous intensity and mortality. PLoS Med 2012;9(11):e1001335 — activity offset
Cite this page
APA: ClockTotals. (2026, October 16). Life Expectancy Calculator. https://clocktotals.com/life-expectancy-calculator/
MLA: “Life Expectancy Calculator.” ClockTotals, 16 Oct. 2026, clocktotals.com/life-expectancy-calculator/.
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