Life Expectancy Calculator
See your estimated life expectancy based on age, smoking status, exercise habits, and BMI. Not a medical tool — a planning tool. Use it to make the years count.
Regular exercise adds 3–7 years of life expectancy. Not smoking adds 10. The choices compound just like money does.
78.4
current US average life expectancy in years
4,160
weeks the average person lives from birth
-10 yr
life expectancy reduction from smoking
What actually determines how long you live
Weeks, not years
4,160 weeks sounds like a lot. But if you're 35, you've already used about 1,820 of them. The remaining ~2,340 weeks don't look as infinite when you see them in a grid — which is why tools like Life in Weeks are so powerful.
The compression of morbidity
The goal isn't just to live longer — it's to compress the period of decline into a short window at the end. Regular exercise, healthy diet, and non-smoking are the most evidence-based approaches to healthspan, not just lifespan.
What changes behaviour more than knowing?
Mortality salience — awareness of death — is well-documented as a driver of behaviour change when channelled positively. People who reflect on their remaining time report making more deliberate choices about relationships, work, and health.
How the estimate is calculated
Starting from the US average of 78.5 years, the calculator adjusts based on: smoking (−10), exercise frequency (+0 to +6), and BMI (−1 to −3 for outside healthy range).
This is an illustrative estimate — not a medical or actuarial calculation. Actual lifespan is affected by genetics, environment, access to healthcare, and many factors not captured here.