Life expectancy calculator
A research-based estimate of your life expectancy — and how many years, months, and weeks you likely have left.
How the estimate is calculated
The baseline life expectancy comes from WHO global averages: approximately 73.8 years for males and 79.0 years for females (2024 data). Research-based adjustments are then applied for each lifestyle and health factor:
- Smoking: −10 years (current), −5 years (former) — NEJM 2013
- Heavy alcohol: −4 years; moderate: −0.5 years — WHO Global Status Report
- Regular exercise (≥150 min/week): +3 years — Lancet 2011
- Obesity (BMI 30+): −3 years; overweight: −1 year; underweight: −2 years
- Diabetes: −6 years — Lancet 2010
- Higher education: +2 years — Lancet 2017
- Married / long-term partner: +1.5 years
- Higher income (top quartile): +2 years
- Self-rated health (Excellent): +2 years; (Poor): −5 years
Adjustments are additive and the result is capped between your current age (you can't have a negative years-left figure) and 105 years.
Why this matters
Knowing your approximate time horizon — even as a rough estimate — is clarifying. Left is built around exactly this idea: the time you have left is finite, and seeing it clearly is the first step to using it intentionally. The life expectancy calculator gives you a number to work with. What you do with that number is up to you.
Limitations
Population-level averages cannot predict individual outcomes. Genetics, access to healthcare, location, and countless other factors are not captured here. Treat this as a rough benchmark, not a prediction. For health decisions, consult a medical professional.
Start noticing what matters.
Download Left on your iPhone to see the time you have left, dates you are looking forward to, build the habits you want to keep, and become a better version of yourself.
Scan with your camera to find Left on the App Store. Or search "Left" on the App Store.