Life Expectancy Calculator
Lifestyle-adjusted life expectancy estimate.
About this tool
This estimate starts from average life expectancy at birth (men ~79, women ~83 in most high-income countries) and adjusts for the lifestyle factors with the strongest population-level evidence: smoking, physical activity, BMI, alcohol, diet, and sleep.
It is not a personal prediction. Two people with identical answers can have very different lives. The value is in seeing where your modifiable years sit — and what you'd gain by changing them.
Coefficients are simplified from the GBD (Global Burden of Disease) and the EPIC and Nurses' Health Study cohorts.
Frequently asked questions
Why isn't my family history in here?
Genetics matter, but for most adults lifestyle accounts for the larger share of remaining years. Family history would only modestly shift the headline number.
What single change gives the most years?
Quitting smoking — by far. Every year off cigarettes returns lost life expectancy, even after decades of smoking.
Why does sleep matter?
Chronic short sleep (<6 hr) and very long sleep (>10 hr) are both linked to higher all-cause mortality. 7–9 hours is the consistent sweet spot.
⚕️ Educational only — not a substitute for professional medical advice, diagnosis, or treatment. In an emergency call your local emergency services.