Life Expectancy Calculator
Estimate your life expectancy based on lifestyle factors.
See how exercise, diet, smoking, and other habits affect your expected lifespan.
Life expectancy estimation starts with a population baseline for your sex and age, then applies well-documented adjustments based on lifestyle factors studied in large longitudinal health studies.
Base life expectancy (developed countries, 2025 WHO data):
- Male: 76 years
- Female: 81 years
Adjustment formula:
Estimated Lifespan = Base + Exercise Adj + Weight Adj + Smoking Adj + Alcohol Adj + Sleep Adj + Social Adj + Diet Adj
Evidence-based lifestyle adjustments:
| Factor | Impact on Lifespan |
|---|---|
| Regular exercise (150+ min/week) | +3 to +7 years |
| Healthy body weight (BMI 18.5–24.9) | +2 to +4 years |
| Non-smoker vs. smoker | +10 years |
| Moderate alcohol (1–2 drinks/day) | +0 to +1 year |
| No alcohol | Neutral (vs. light drinker) |
| Strong social connections | +3 to +5 years |
| Mediterranean-style diet | +2 to +4 years |
| Consistent 7–8 hours sleep | +2 to +3 years |
| Low chronic stress | +2 to +3 years |
Worked example: A 35-year-old woman: base 81 years
- Exercises 4× per week: +5 years
- Healthy weight: +3 years
- Non-smoker: +10 years (vs. smoker baseline)
- 7 hours sleep nightly: +2 years
- Estimated lifespan: ~86–90 years
Important context: This is a statistical population estimate, not a medical prediction. Individual genetics, access to healthcare, geography, and random life events play enormous roles. Use this as a motivational tool — not a diagnosis. Consult a physician for personalized health guidance.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
SuperGlobalCalculator is independently built and maintained. See how we build and verify our calculators.