Life Expectancy Calculator

This calculator uses a statistical baseline life expectancy derived from population data (adjusted for biological sex and current age), then applies lifestyle modifiers for smoking, alcohol, exercise, diet, BMI, chronic conditions, stress, and sleep. Each factor adds or subtracts years based on peer-reviewed epidemiological research. The result is an estimate, not a medical prediction.

Health age is an estimate of how old your body is functionally, based on your lifestyle choices. If your health age is lower than your calendar age, your habits are extending your longevity. If it's higher, certain lifestyle factors may be accelerating biological aging. It's a useful motivational metric to compare your habits against the average.

The biggest factors are smoking status, physical activity level, BMI, chronic disease burden, and diet quality. Smoking is consistently one of the most significant negative factors, reducing lifespan by up to 10 years on average. Regular exercise and a healthy diet can add several years. Genetics also play a role, though this calculator focuses on modifiable lifestyle factors.

On average, women live several years longer than men globally. This is influenced by hormonal differences, higher rates of risk-taking behaviors in men, differences in healthcare-seeking behavior, and biological factors affecting cardiovascular and immune health. The baseline life expectancy in this calculator accounts for these statistically observed differences.

Yes — research consistently shows that lifestyle modifications can meaningfully extend healthy lifespan. Quitting smoking, increasing physical activity, improving diet, maintaining a healthy weight, and managing stress are all actions with documented positive effects on longevity. This calculator's lifestyle impact score shows how your current habits compare to optimal choices.

Both underweight (BMI below 18.5) and obesity (BMI above 30) are associated with reduced life expectancy. The optimal BMI range for longevity is roughly 20–25. Obesity increases risk of cardiovascular disease, type 2 diabetes, and certain cancers, while being underweight is associated with nutritional deficiencies and weakened immune function.

Chronic high stress is linked to elevated cortisol levels, increased inflammation, higher blood pressure, and poor sleep quality — all of which negatively impact long-term health. Studies suggest chronic stress can shorten lifespan by 2–3 years on average, though the effect is partly mediated by related behaviors like poor sleep, smoking, and overeating.

This tool provides a statistical estimate based on population-level research and is intended for general informational and educational purposes only. It is not a medical diagnosis or clinical prediction. Many individual factors — including genetics, access to healthcare, and environment — are not captured here. Consult a healthcare professional for personalized health assessments.