ganak.appLife Expectancy Calculator
Calculate your estimated life expectancy based on age, gender, country, lifestyle habits, and health factors. Includes survival probability curve, health age comparison, factor impact breakdown, and personalized recommendations. Uses WHO and SSA actuarial data with evidence-based adjustments for smoking, exercise, BMI, diet, sleep, stress, and more.
Life Expectancy Summary
Remaining years, health age, and country comparison
Survival Probability
Probability of reaching each age based on your profile
What is Life Expectancy?
Understanding longevity statistics
Life expectancy is a statistical measure of the average number of years a person is expected to live, based on their current age, gender, and demographic data. It is calculated from actuarial life tables that track mortality rates across populations.
Unlike maximum lifespan, life expectancy is a population-level average that can be significantly influenced by individual lifestyle choices. The gap between the two shows how much room there is for personal health decisions to make a difference.
How We Calculate Life Expectancy
The baseline + adjustment method
Our calculator uses a two-step approach used by actuaries and epidemiologists:
Life Expectancy = Country Baseline + Lifestyle Adjustments
Country & Age Baseline
We start with WHO and SSA country-specific data for your age and gender. Someone who has already survived to age 50 has a higher remaining life expectancy than the at-birth average (conditional survival).
Lifestyle & Health Adjustments
We add or subtract years based on published epidemiological research for each factor — smoking, exercise, BMI, diet, sleep, stress, family history, chronic conditions, blood pressure, and social connections.
Data sources: WHO Global Health Observatory, SSA Period Life Tables (2023), CDC National Vital Statistics, published meta-analyses from The Lancet and NEJM.
Factors That Affect Life Expectancy
What matters most for longevity
Smoking (heavy)
Severe obesity
Heavy alcohol use
Social isolation
Regular exercise
Excellent diet
Family history (90+)
Low stress + good sleep
Common Mistakes When Estimating Life Expectancy
What people get wrong
Confusing life expectancy with maximum lifespan
Life expectancy is an average — many people live well beyond it, and many don't reach it.
Ignoring conditional survival
If you're already 60, you've beaten many risks. Your remaining life expectancy is higher than what was predicted at birth.
Treating BMI as the only weight metric
BMI doesn't capture muscle mass, fat distribution, or metabolic health. A fit athlete may have a high BMI but excellent health.
Underestimating social and mental health
Loneliness and chronic stress have comparable mortality impacts to smoking.
Assuming these numbers are fixed
Lifestyle changes at any age can significantly alter your trajectory. Quitting smoking at 40 still adds back ~6 years.