How long will I live? Life expectancy estimate
Ten short questions — your birth date, a life table and eight everyday habits — give an average estimate with every source shown. It’s worked out in your browser; nothing is sent anywhere.
How the estimate works
The starting point is the 2021 US period life table from the Social Security Administration: the average number of years left at ages 0, 10, 20 and so on up to 100, joined with straight lines in between. “Prefer not to say” uses the average of the female and male tables.
Each habit then adds or takes away years. Where a study reports a hazard ratio (HR), we convert it with −11.5 × ln(HR), the “speed of ageing” shift described by Spiegelhalter in the BMJ (2012); other studies report years directly. The effects are added together and the result never drops below one year. Everything is recalculated for today’s date each time you open the page, so the numbers move a little every week.
Not medical advice. This is an educational estimate from population averages and observational studies. It can’t account for your health, genes or circumstances, and it isn’t a prediction for any one person.
More age & life tools
Frequently asked questions
How is my estimate worked out?
We read the average years left for your age from the 2021 US period life table, then add or subtract the effect of each habit as reported by a large published study. The total is turned into weeks and a date counted from today, and it never drops below one year.
How accurate is it?
It's an average for people who answer the same way, not a prediction for you. Real lifespans spread widely around the average — roughly half of people live longer — and much that matters, like your health, family history and where you live, isn't asked here.
Which answers change it the most?
In this model, smoking now takes away 10 years and heavy drinking 4 years 6 months, while regular exercise adds up to 4 years 2 months and walking 10,000 steps a day adds 3 years. Sleeping less than 6 or more than 9 hours a night also lowers the estimate.
Is this medical advice?
No. It's an educational tool built on population statistics and observational studies. For questions about your own health or habits, please talk to a doctor or another qualified professional.
Prefer to explore without the quiz? The habits calculator shows each study’s effect side by side.