Life Expectancy Calculator
Personal Information
Enter your age in years (1–99). Your actuarial baseline is calculated from this.
Use a BMI calculator if needed: weight (kg) / height (m)². Normal range: 18.5–24.9.
Lifestyle Factors
Medical History
Enter Your Health Profile
Fill in your age, sex, region, BMI, and lifestyle factors above to see your estimated life expectancy, healthy years, biological age, and personalized risk factor breakdown.
How to Use the Life Expectancy Calculator
Enter Your Personal Information
Start by selecting your biological sex, entering your current age in years, choosing your country or region from the dropdown, and entering your BMI. If you do not know your BMI, use a BMI calculator — it is simply your weight in kilograms divided by your height in meters squared. The regional selection adjusts your baseline for population-level differences in healthcare, diet, and environment across different countries.
Complete Your Lifestyle Profile
Work through the six lifestyle dropdowns: smoking status, physical activity level, sleep hours per night, alcohol consumption, diet quality, and stress level. Each of these factors has a documented impact on longevity ranging from minus ten years for daily smoking to plus four years for an active exercise routine. Choose the option that best reflects your actual habits over the past year, not your aspirational behavior. Honest inputs produce more useful results.
Add Your Medical History
Select your blood pressure status, any chronic conditions (diabetes, heart disease, or multiple conditions), and your family history. If grandparents on both sides lived to age 90 or beyond, select the family longevity option — this adds two years to your estimate based on heritable longevity factors. If a parent or sibling had a heart attack or cancer diagnosis before age 55, select the strong early history option. Your results update automatically as you make selections.
Review Results and Use What-If Scenarios
Scroll to the results panel to see your estimated life expectancy, years remaining, biological age, healthy years, and risk score. Study the factor breakdown chart to identify your biggest modifiable risk factors — these are the habits where change will have the most impact. If you smoke or are sedentary, check the what-if scenario boxes to instantly see how quitting or exercising would shift your estimate. Use the Export CSV button to save your results for financial planning or healthcare discussions.
Frequently Asked Questions
How accurate is this life expectancy calculator?
This calculator uses the same actuarial life table data that the Social Security Administration and insurance companies use as a baseline. The lifestyle adjustments are derived from large peer-reviewed cohort studies, including NEJM, Harvard T.H. Chan School of Public Health, JAMA, and Lancet research. However, no calculator can account for individual genetic variation, future medical breakthroughs, accidents, or rare diseases. The result should be interpreted as a probability-weighted estimate with a realistic uncertainty range of plus or minus 5 to 10 years. It is most useful for identifying which lifestyle factors are having the largest impact on your estimate and for motivating behavior change, not for precise financial or medical planning without professional consultation.
Why does smoking reduce life expectancy by so much?
Daily smoking is the single most preventable cause of premature death in developed countries. Research published in the New England Journal of Medicine and tracked across large US cohorts shows that current smokers lose an average of 10 years of life compared to people who have never smoked. The mechanisms are well understood: smoking causes direct damage to DNA, causes chronic inflammation, dramatically accelerates atherosclerosis (arterial plaque), increases the risk of lung, mouth, throat, bladder, kidney, and cervical cancers, and impairs immune function. Even light or occasional smoking causes measurable harm. The good news is that quitting before age 40 recovers nearly all of the lost years according to NEJM Evidence 2024, which is why the what-if scenario for quitting smoking can show a dramatic positive shift in your estimate.
What is biological age and how is it calculated?
Biological age is a concept that attempts to quantify how old your body functions relative to your chronological (calendar) age. A 45-year-old with multiple risk factors — smoking, high blood pressure, obesity, and a sedentary lifestyle — may have biological processes operating at the level of a 55 or 60-year-old. Conversely, a highly fit, non-smoking, low-stress 55-year-old may have a biological age of 47 or 48. Our calculator derives biological age from your accumulated risk score using the formula: biological age equals chronological age plus the quantity of risk score minus 50 divided by 5. A risk score of 50 represents an average health profile. Risk scores below 50 produce a biological age younger than your real age, while scores above 50 produce an older biological age. Clinical biological age assessments use blood biomarkers and genetic methylation tests, which are more precise but require laboratory testing.
What does the healthy life expectancy number mean?
Healthy life expectancy (HLE) represents the number of years you are projected to live in good health, free from significant disability or chronic illness that substantially limits daily activities. It is derived from your total life expectancy by subtracting an estimated number of unhealthy end-of-life years based on your risk score. People with low risk scores (excellent health profiles) are projected to spend only 3 years in poor health before death, while people with very high risk scores may spend 12 or more years with significant functional limitations. The concept comes from the World Health Organization's HALE (Health-Adjusted Life Expectancy) metric. Maximizing healthy life expectancy — not just total life expectancy — is the real goal of preventive health. Our donut chart visually shows the split between your projected healthy and unhealthy remaining years.
How does family history affect life expectancy?
Family history influences life expectancy through two distinct pathways: inherited disease risk and inherited longevity genetics. If a parent or sibling was diagnosed with cardiovascular disease or cancer before age 55, you likely carry elevated genetic predispositions that add to your risk profile. Our calculator subtracts 3 years in this scenario based on Framingham Heart Study heritability data. Conversely, if grandparents on both sides lived to age 90 or beyond, this signals strong heritable longevity genetics — associated with favorable cardiovascular gene variants, efficient DNA repair mechanisms, and resilient immune function. Our calculator adds 2 years for confirmed family longevity. If some relatives had major disease before age 65 but not extremely early, 1.5 years are subtracted as a moderate adjustment. Family history is one of the few non-modifiable risk factors in this calculator, making the modifiable factors all the more important to address.
Can I really add years to my life by changing my lifestyle?
Yes — the scientific evidence for modifiable lifestyle factors is among the strongest in all of epidemiology. Regular physical activity meeting the 150-minute-per-week guideline is associated with 3.4 to 4.5 additional years of life in Harvard cohort studies. Quitting smoking before age 40 recovers nearly all of the years that would have been lost. Adopting a Mediterranean-style diet rich in fruits, vegetables, whole grains, and olive oil adds approximately 3.5 years in our model, consistent with Taiwanese and Harvard cohort research. Managing chronic stress, achieving optimal sleep (7 to 9 hours per night), and maintaining a healthy BMI each contribute additional years. The most encouraging finding from longevity research is that these factors are compounding — a person who exercises regularly, eats well, does not smoke, and manages stress can reasonably expect 8 to 12 additional healthy years compared to a sedentary, smoking peer of the same age.