How Life Expectancy Is Estimated
This calculator starts from average national life expectancy figures (78 years for males, 83 years for females, based on WHO global averages) and applies evidence-based adjustments for modifiable lifestyle factors. It is a simplified model for educational awareness â not a clinical assessment.
The adjustments reflect findings from large-scale epidemiological studies. For example, heavy smoking is associated with a 10â12 year reduction in life expectancy (CDC), while regular vigorous exercise adds 3â4 years on average (NEJM, 2022).
Frequently Asked Questions
What factors affect life expectancy the most?
The biggest modifiable risk factors are smoking (reduces life expectancy by 10+ years), physical inactivity, obesity, excessive alcohol consumption, and chronic stress. Non-modifiable factors include genetics, sex (women live on average 4â5 years longer), and country of birth.
How much does exercise add to your life?
Regular exercise is one of the most powerful longevity tools. Studies show that 150 minutes of moderate exercise per week is associated with 3â4 additional years of life compared to a sedentary lifestyle. More vigorous exercise shows even greater benefits.
Can you reverse the damage from years of smoking?
Yes. Within 1 year of quitting, heart disease risk drops by 50%. After 10 years, lung cancer risk falls to roughly half that of a current smoker. The body has a remarkable ability to repair itself, and it is never too late to quit for meaningful health gains.
This calculator is an educational tool based on population-level statistics and simplified models. It cannot predict any individual's lifespan. Life expectancy is influenced by hundreds of factors not captured here. Do not use this result to make medical or financial decisions without consulting a qualified professional.