Life Expectancy Calculator

Estimate your life expectancy based on lifestyle factors — for educational and planning purposes.

Current age

Sex

Smoking status

Exercise level

BMI category

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Fill in the details to get your result.

How This Works

Base life expectancy from UK ONS 2024 national life tables: ~79 years (male), ~83 years (female). Adjustments applied for lifestyle factors based on epidemiological research: smoking (Doll Oxford cohort study), exercise (Paffenbarger et al), BMI (Global BMI Mortality Collaboration). These are statistical averages — individual outcomes depend on genetics, healthcare access, luck and many unmeasured factors.

Ranked by average years of life gained: not smoking vs heavy smoking: ~8–10 years. Healthy weight vs obese: ~3–7 years. Regular vigorous exercise: ~3–4 years. Mediterranean diet vs poor diet: ~2–3 years. Strong social connections: ~2–3 years (loneliness is as harmful as smoking 15 cigarettes/day). Good sleep (7–8 hours): ~2 years. Genetics account for ~25% of longevity variation; the rest is modifiable.