When will I die?
People ask this as “when will I die” or “how long will I live”. For an average person your age, sex and country, the answer is the date in the result box above. For most adults in rich countries it lands somewhere between 75 and 90. Your habits move it by a few years either way, and the calculator shows exactly how many. What no calculator can tell you is your own date: half of people with your answers live past it and half do not.
How long will I live if I change my habits?
Change any answer and the date updates straight away, so you can see how long you would live with each habit. The biggest single change for each person is shown in the “Your biggest win” box.
How this death clock works
Most death clocks do not say how they get their answer. This one does, so you can judge it yourself. There are three steps.
1. Start from an official life table for your age
A life table lists, for every age, how many more years an average person of that age lives. This matters: a 60-year-old is not expected to die at the life expectancy of a newborn. Having already reached 60, the average American man has about 21.8 more years, which is to about 82.
2. Use your country's own table
For the United States we use the Social Security period life table (2023 data, used in the 2026 Trustees Report), which has a value for every single age. For the other 184 countries we use the World Health Organization life tables, men and women separately. We use the WHO 2019 tables on purpose: the newer 2020 and 2021 tables are pulled down by COVID-19 deaths, and 2019 is closer to life expectancy today.
3. Adjust for six habits
Only habits with large, well-studied effects are included. The years below apply at age 40 or younger. Past 40 they shrink in proportion to the years you have left, because a habit has less time to act. These studies compare groups of people; they show strong links, not proof that a habit alone causes each year.
Smoking
Smoke now: 10 years earlier than never smoked. Quit: 2 years earlier than never smoked. The quit figure is our assumption, based on the finding that quitting before about 40 avoids about 90% of the extra risk; quitting later avoids less.
Jha P, et al. 21st-century hazards of smoking and benefits of cessation in the United States. N Engl J Med. 2013;368(4):341-350.
Exercise
Counted as brisk walking or harder, which is about 3 METs, so 2.5 hours a week is about 7.5 MET-hours. Compared with no leisure exercise, the study found about 1.8 to 2.5 more years below 7.5 MET-hours a week, 3.4 years at 7.5 to 15, and about 4.5 years above that. We treat “under 2.5 hours” as the average person, so our answers run from 2 years earlier (almost none) to 2.5 years later (5+ hours).
Moore SC, et al. Leisure time physical activity of moderate to vigorous intensity and mortality. PLoS Med. 2012;9(11):e1001335.
Weight (BMI)
Healthy weight (18.5 to 25): half a year later. Overweight (25 to 30): no change. BMI 30 to 35: 3 years earlier. BMI 35 to 40: 5 years earlier (our estimate between the study’s results). BMI 40+: 8 years earlier. Under 18.5: no change, because death rates are higher at low BMI but the study cannot separate thinness from illness that causes it.
Prospective Studies Collaboration. Body-mass index and cause-specific mortality in 900 000 adults. Lancet. 2009;373(9669):1083-1096.
Alcohol
One US drink is 14 g of alcohol. Compared with drinkers under 100 g a week (about 7 drinks): 8 to 14 drinks, half a year earlier; 15 to 24 drinks, 1.5 years earlier; 25+ drinks, 4.5 years earlier. The study looked at people who drink, so 0 to 7 drinks is the reference and gets no bonus.
Wood AM, et al. Risk thresholds for alcohol consumption. Lancet. 2018;391(10129):1513-1523.
Sleep
Under 6 hours a night: 1.3 years earlier. 6 to 9 hours: no change. The study found about 12% higher death risk for short sleepers; it gives risk, not years, so we converted it ourselves using the rule that death risk roughly doubles every 8 years of age. More than 9 hours: no change. Long sleepers had about 30% higher risk, but illness often causes long sleep, so we do not count it against you. The study’s reference group slept 7 to 8 hours and most of its “short” cut-offs were under 7 hours; treating 6 to 9 hours as no change is our own, wider grouping. Both short and long sleep come from observational studies, so illness, insomnia or other conditions may explain part of the link.
Cappuccio FP, et al. Sleep duration and all-cause mortality: a systematic review and meta-analysis of prospective studies. Sleep. 2010;33(5):585-592.
Sleep schedule
How regular your sleep is predicted death risk better than how long you sleep. In the study, the most regular fifth of people fell asleep and woke within about a 1-hour window on most days; the least regular fifth varied by about 3 hours. After adjusting for health, habits and income, the most regular had 30% lower risk than the least regular, and the middle groups 20% to 28% lower. Converted the same way as sleep length and measured from the middle: within about 1 hour, 0.8 years later; 1 to 3 hours, no change; more than 3 hours or shift work, 3.3 years earlier. The study scored regularity on a continuous index, not in hours; the two ends use the authors’ own description, and the middle 1-to-3-hour group is our own approximation. The study measured sleep with a wrist device for one week in people aged about 63; you are estimating your own, and the authors note irregular sleep may be partly a sign of poor health rather than only a cause.
Windred DP, et al. Sleep regularity is a stronger predictor of mortality risk than sleep duration: a prospective cohort study. Sleep. 2024;47(1):zsad253.
Your death clock never shows less than six months. There is no random number in the result: the same answers always give the same date.
Is a death clock accurate?
No death clock can predict when one person will die. What it can do is tell you when people with your age, sex, country and habits die on average. Use it as a nudge, not a forecast.
Limits of this calculator
- It gives an average for people who answered like you. Half of them live longer.
- It cannot see illness, family history, your genes, where you live within a country, income or access to medical care.
- Habit effects come from studies of groups and are rounded. They are not added up by any medical guideline.
- WHO tables come in five-year age groups. Ages in between are filled in on a straight line.
- Past age 85 the WHO tables have one value, so we extend it using the shape of the US table.
- For countries hit by war, a disaster or another large rise in deaths since 2019, the 2019 table will be too optimistic.
What it will not tell you
- How or from what you will die.
- Whether you are ill. If you feel unwell, see a doctor.
- Anything about another specific person.
Death countdown: timer, counter or calendar
People call the same idea by many names: a death countdown, death timer, death counter, death calendar, life clock, life countdown, death date calculator or death age calculator. They all mean two things. First an estimated date. Then a live timer counting down to it in years, days, hours, minutes and seconds.
This page does both. After you get your date, the countdown keeps running while the page is open, and it is saved in your browser, so it is still there when you come back. Many people find the number of days left more striking than the date itself: a 40-year-old has roughly 14,000 days to go.
You can share your countdown with the share link. The link only contains your estimated death date, not your birthday or answers.
Who makes this and how it is funded
Death Clock Calc is made by an independent developer. It is free to use. In the future the site may show ads. It does not sell insurance, supplements, tests or subscriptions, and no company pays to influence the result.
Questions
Why is my date different from other death clock sites?
Many sites add a random factor or use one life expectancy number for everyone. This one starts from your exact age in an official life table, so older users usually get a later date than a simple calculator gives them.
Do you store my birthday or answers?
Not on our server. The calculation runs in your browser. Your answers are saved only in your own browser so your countdown is still there next time; clearing your browser data removes them. The share link only contains your estimated death date.
Which change adds the most years?
For most smokers, quitting. After that it is usually moving from no exercise to regular exercise, or moving out of the obese BMI range. The result box shows your personal biggest win.