Life Expectancy Calculator
An estimate of remaining years based on a starting life expectancy and a few lifestyle factors.
Life expectancy figures are averages for a population, not predictions for a person. What they are useful for is the arithmetic of time: how many years, weekends and hours a plausible remaining life contains.
Enter your age and a starting life expectancy, then adjust for the few factors with the strongest evidence behind them, and this calculator shows the remaining time in several units and what the adjustments changed.
At a glance
- What you enter
- Your age, Life expectancy for your age and sex, Smoking, Physical activity, Diet, Alcohol, Sleep, Hours a week on what matters most
- What you get
- Estimated life expectancy, Estimated years remaining, Weeks remaining, Hours for your priorities, Adjustment in years
- Formula shown
- Yes - every step, right below your results.
- Cost and privacy
- Free, no account needed, and nothing you type is stored.
See worked examples ↓ Read the FAQ ↓ Share this calculator ↓
Results are estimates for general information only - always verify with a professional or official source before acting on them.
How to use the Life Expectancy Calculator
- 1 Enter Your age (years)
- 2 Enter Life expectancy for your age and sex (years) - Look this up in your national statistics rather than guessing.
- 3 Enter Smoking
- 4 Enter Physical activity
- 5 Enter Diet
- 6 Enter Alcohol
- 7 Enter Sleep
- 8 Enter Hours a week on what matters most (hours) - Used to turn the remaining time into hours for your priorities.
- 9 Press Calculate. You get Estimated life expectancy, Estimated years remaining, Weeks remaining, Hours for your priorities, Adjustment in years, and every intermediate step stays visible under “How is this calculated?”
- 10 Change one number at a time to see what moves the result - that is usually the most useful thing a calculator can tell you.
Worked examples
Real numbers run through this calculator. Open any example to load it into the form above and change it.
A 45 year old with regular exercise and a good diet
A baseline of 84 years with the exercise and diet multipliers applied.
You enter
- Your age
- 45 years
- Life expectancy for your age and sex
- 84 years
- Smoking
- 1
- Physical activity
- 1.05
- Diet
- 1.04
- Alcohol
- 1
- Sleep
- 1
- Hours a week on what matters most
- 12 hours
You get
- Estimated life expectancy
- 91.73 years
- Estimated years remaining
- 46.73 years
- Weeks remaining
- 2,430
- Hours for your priorities
- 29,158
- Adjustment in years
- 7.73 years
The exercise and diet multipliers combine to 1.09 and take the baseline from 84 to 91.73, an adjustment of 7.73 years in this arithmetic. That leaves about 46.73 years, or 2,430 weeks, which is about 17,056 days or 409,337 hours. At 12 hours a week on what matters most, that is 29,158 hours. This is a population estimate adjusted by rough multipliers, not a prediction for an individual, and it is not medical advice.
A 58 year old who smokes under ten a day
A baseline of 80 years with the smoking and alcohol multipliers applied.
You enter
- Your age
- 58 years
- Life expectancy for your age and sex
- 80 years
- Smoking
- 0.8
- Physical activity
- 1
- Diet
- 1
- Alcohol
- 0.97
- Sleep
- 1
- Hours a week on what matters most
- 15 hours
You get
- Estimated life expectancy
- 62.08 years
- Estimated years remaining
- 4.08 years
- Weeks remaining
- 212
- Hours for your priorities
- 3,182
- Adjustment in years
- -17.92 years
The two multipliers combine to 0.78, taking the baseline from 80 to 62.08, an adjustment of minus 17.92 years. That leaves about 4.08 years, or 212 weeks, which is about 1,489 days or 35,741 hours, and 15 hours a week for priorities comes to 3,182 hours. The multipliers compound, which is why two modest factors remove more time than adding them together would suggest. This is population arithmetic, not a prediction, and it is not medical advice.
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Frequently asked questions
Is this a prediction of how long I will live?
No. It is arithmetic on a population average plus a small set of rough multipliers, and it knows nothing about you as an individual. Two people who give identical answers can have completely different outcomes, and this is not a diagnosis, a prognosis or medical advice. Speak to a doctor about your own health rather than to a calculator.
What the page is genuinely useful for is the arithmetic of time: turning years into weeks, days and hours, and showing what a weekly habit amounts to over the years that remain. Read the units rather than the date.
Where should the starting life expectancy come from?
From a national statistics table for your age and sex, not from a guess and not from the figure at birth that appears in headlines. Life expectancy at your current age is usually higher than life expectancy at birth, because reaching your age means the risks of the earlier years are already behind you.
Tables are also published by region and by social group, and the differences between those tables can be larger than the effect of any single lifestyle adjustment here. Use the one closest to your own circumstances, and check the year it was published.
How do the lifestyle adjustments work?
Each one is a rough multiplier taken from population studies rather than from anything about you, and they are multiplied together rather than added. A smoking multiplier of 0.8 and an alcohol multiplier of 0.97 give 0.78, so together they remove about 22% of the baseline rather than the sum of the two. The combined adjustment line shows the product so its size is visible.
Population multipliers cannot say what will happen to any one person, and the evidence behind each factor is not equally strong. Treat the adjustments as a way of seeing which habits move the estimate, not as a price list for years.
What is the hours for your priorities figure?
It multiplies the remaining weeks by the hours a week you say you give to what matters most. Twelve hours a week across about 2,430 remaining weeks is 29,158 hours, which turns a weekly habit into a total rather than a small recurring cost.
The calculation assumes the habit continues at the same rate for the whole period, which is a simplification. Its value is comparative: change the hours a week and the total changes in proportion, which is often enough to prompt a decision about how the time is spent.